1 <?xml version="1.0" encoding="utf-8"?>
2 <database title="Open vSwitch Configuration Database">
4 A database with this schema holds the configuration for one Open
5 vSwitch daemon. The top-level configuration for the daemon is the
6 <ref table="Open_vSwitch"/> table, which must have exactly one
7 record. Records in other tables are significant only when they
8 can be reached directly or indirectly from the <ref
9 table="Open_vSwitch"/> table. Records that are not reachable from
10 the <ref table="Open_vSwitch"/> table are automatically deleted
11 from the database, except for records in a few distinguished
15 <h2>Common Columns</h2>
18 Most tables contain two special columns, named <code>other_config</code>
19 and <code>external_ids</code>. These columns have the same form and
20 purpose each place that they appear, so we describe them here to save space
25 <dt><code>other_config</code>: map of string-string pairs</dt>
28 Key-value pairs for configuring rarely used features. Supported keys,
29 along with the forms taken by their values, are documented individually
33 A few tables do not have <code>other_config</code> columns because no
34 key-value pairs have yet been defined for them.
38 <dt><code>external_ids</code>: map of string-string pairs</dt>
40 Key-value pairs for use by external frameworks that integrate with Open
41 vSwitch, rather than by Open vSwitch itself. System integrators should
42 either use the Open vSwitch development mailing list to coordinate on
43 common key-value definitions, or choose key names that are likely to be
44 unique. In some cases, where key-value pairs have been defined that are
45 likely to be widely useful, they are documented individually for each
50 <table name="Open_vSwitch" title="Open vSwitch configuration.">
51 Configuration for an Open vSwitch daemon. There must be exactly
52 one record in the <ref table="Open_vSwitch"/> table.
54 <group title="Configuration">
55 <column name="bridges">
56 Set of bridges managed by the daemon.
60 SSL used globally by the daemon.
63 <column name="external_ids" key="system-id">
64 A unique identifier for the Open vSwitch's physical host.
65 The form of the identifier depends on the type of the host.
66 On a Citrix XenServer, this will likely be the same as
67 <ref column="external_ids" key="xs-system-uuid"/>.
70 <column name="external_ids" key="xs-system-uuid">
71 The Citrix XenServer universally unique identifier for the physical
72 host as displayed by <code>xe host-list</code>.
76 <group title="Status">
77 <column name="next_cfg">
78 Sequence number for client to increment. When a client modifies
79 any part of the database configuration and wishes to wait for
80 Open vSwitch to finish applying the changes, it may increment
84 <column name="cur_cfg">
85 Sequence number that Open vSwitch sets to the current value of
86 <ref column="next_cfg"/> after it finishes applying a set of
87 configuration changes.
90 <column name="capabilities">
91 Describes functionality supported by the hardware and software platform
92 on which this Open vSwitch is based. Clients should not modify this
93 column. See the <ref table="Capability"/> description for defined
94 capability categories and the meaning of associated
95 <ref table="Capability"/> records.
98 <group title="Statistics">
100 The <code>statistics</code> column contains key-value pairs that
101 report statistics about a system running an Open vSwitch. These are
102 updated periodically (currently, every 5 seconds). Key-value pairs
103 that cannot be determined or that do not apply to a platform are
107 <column name="other_config" key="enable-statistics"
108 type='{"type": "boolean"}'>
109 Statistics are disabled by default to avoid overhead in the common
110 case when statistics gathering is not useful. Set this value to
111 <code>true</code> to enable populating the <ref column="statistics"/>
112 column or to <code>false</code> to explicitly disable it.
115 <column name="statistics" key="cpu"
116 type='{"type": "integer", "minInteger": 1}'>
118 Number of CPU processors, threads, or cores currently online and
119 available to the operating system on which Open vSwitch is running,
120 as an integer. This may be less than the number installed, if some
121 are not online or if they are not available to the operating
125 Open vSwitch userspace processes are not multithreaded, but the
126 Linux kernel-based datapath is.
130 <column name="statistics" key="load_average">
131 A comma-separated list of three floating-point numbers,
132 representing the system load average over the last 1, 5, and 15
133 minutes, respectively.
136 <column name="statistics" key="memory">
138 A comma-separated list of integers, each of which represents a
139 quantity of memory in kilobytes that describes the operating
140 system on which Open vSwitch is running. In respective order,
145 <li>Total amount of RAM allocated to the OS.</li>
146 <li>RAM allocated to the OS that is in use.</li>
147 <li>RAM that can be flushed out to disk or otherwise discarded
148 if that space is needed for another purpose. This number is
149 necessarily less than or equal to the previous value.</li>
150 <li>Total disk space allocated for swap.</li>
151 <li>Swap space currently in use.</li>
155 On Linux, all five values can be determined and are included. On
156 other operating systems, only the first two values can be
157 determined, so the list will only have two values.
161 <column name="statistics" key="process_NAME">
163 One such key-value pair, with <code>NAME</code> replaced by
164 a process name, will exist for each running Open vSwitch
165 daemon process, with <var>name</var> replaced by the
166 daemon's name (e.g. <code>process_ovs-vswitchd</code>). The
167 value is a comma-separated list of integers. The integers
168 represent the following, with memory measured in kilobytes
169 and durations in milliseconds:
173 <li>The process's virtual memory size.</li>
174 <li>The process's resident set size.</li>
175 <li>The amount of user and system CPU time consumed by the
177 <li>The number of times that the process has crashed and been
178 automatically restarted by the monitor.</li>
179 <li>The duration since the process was started.</li>
180 <li>The duration for which the process has been running.</li>
184 The interpretation of some of these values depends on whether the
185 process was started with the <option>--monitor</option>. If it
186 was not, then the crash count will always be 0 and the two
187 durations will always be the same. If <option>--monitor</option>
188 was given, then the crash count may be positive; if it is, the
189 latter duration is the amount of time since the most recent crash
194 There will be one key-value pair for each file in Open vSwitch's
195 ``run directory'' (usually <code>/var/run/openvswitch</code>)
196 whose name ends in <code>.pid</code>, whose contents are a
197 process ID, and which is locked by a running process. The
198 <var>name</var> is taken from the pidfile's name.
202 Currently Open vSwitch is only able to obtain all of the above
203 detail on Linux systems. On other systems, the same key-value
204 pairs will be present but the values will always be the empty
209 <column name="statistics" key="file_systems">
211 A space-separated list of information on local, writable file
212 systems. Each item in the list describes one file system and
213 consists in turn of a comma-separated list of the following:
217 <li>Mount point, e.g. <code>/</code> or <code>/var/log</code>.
218 Any spaces or commas in the mount point are replaced by
220 <li>Total size, in kilobytes, as an integer.</li>
221 <li>Amount of storage in use, in kilobytes, as an integer.</li>
225 This key-value pair is omitted if there are no local, writable
226 file systems or if Open vSwitch cannot obtain the needed
233 <group title="Version Reporting">
235 These columns report the types and versions of the hardware and
236 software running Open vSwitch. We recommend in general that software
237 should test whether specific features are supported instead of relying
238 on version number checks. These values are primarily intended for
239 reporting to human administrators.
242 <column name="ovs_version">
243 The Open vSwitch version number, e.g. <code>1.1.0</code>.
244 If Open vSwitch was configured with a build number, then it is
245 also included, e.g. <code>1.1.0+build6579</code>.
248 <column name="db_version">
250 The database schema version number in the form
251 <code><var>major</var>.<var>minor</var>.<var>tweak</var></code>,
252 e.g. <code>1.2.3</code>. Whenever the database schema is changed in
253 a non-backward compatible way (e.g. deleting a column or a table),
254 <var>major</var> is incremented. When the database schema is changed
255 in a backward compatible way (e.g. adding a new column),
256 <var>minor</var> is incremented. When the database schema is changed
257 cosmetically (e.g. reindenting its syntax), <var>tweak</var> is
262 The schema version is part of the database schema, so it can also be
263 retrieved by fetching the schema using the Open vSwitch database
268 <column name="system_type">
270 An identifier for the type of system on top of which Open vSwitch
271 runs, e.g. <code>XenServer</code> or <code>KVM</code>.
274 System integrators are responsible for choosing and setting an
275 appropriate value for this column.
279 <column name="system_version">
281 The version of the system identified by <ref column="system_type"/>,
282 e.g. <code>5.6.100-39265p</code> on XenServer 5.6.100 build 39265.
285 System integrators are responsible for choosing and setting an
286 appropriate value for this column.
292 <group title="Database Configuration">
294 These columns primarily configure the Open vSwitch database
295 (<code>ovsdb-server</code>), not the Open vSwitch switch
296 (<code>ovs-vswitchd</code>). The OVSDB database also uses the <ref
297 column="ssl"/> settings.
301 The Open vSwitch switch does read the database configuration to
302 determine remote IP addresses to which in-band control should apply.
305 <column name="manager_options">
306 Database clients to which the Open vSwitch database server should
307 connect or to which it should listen, along with options for how these
308 connection should be configured. See the <ref table="Manager"/> table
309 for more information.
313 <group title="Common Columns">
314 The overall purpose of these columns is described under <code>Common
315 Columns</code> at the beginning of this document.
317 <column name="other_config"/>
318 <column name="external_ids"/>
322 <table name="Bridge">
324 Configuration for a bridge within an
325 <ref table="Open_vSwitch"/>.
328 A <ref table="Bridge"/> record represents an Ethernet switch with one or
329 more ``ports,'' which are the <ref table="Port"/> records pointed to by
330 the <ref table="Bridge"/>'s <ref column="ports"/> column.
333 <group title="Core Features">
335 Bridge identifier. Should be alphanumeric and no more than about 8
336 bytes long. Must be unique among the names of ports, interfaces, and
340 <column name="ports">
341 Ports included in the bridge.
344 <column name="mirrors">
345 Port mirroring configuration.
348 <column name="netflow">
349 NetFlow configuration.
352 <column name="sflow">
356 <column name="flood_vlans">
358 VLAN IDs of VLANs on which MAC address learning should be disabled,
359 so that packets are flooded instead of being sent to specific ports
360 that are believed to contain packets' destination MACs. This should
361 ordinarily be used to disable MAC learning on VLANs used for
362 mirroring (RSPAN VLANs). It may also be useful for debugging.
365 SLB bonding (see the <ref table="Port" column="bond_mode"/> column in
366 the <ref table="Port"/> table) is incompatible with
367 <code>flood_vlans</code>. Consider using another bonding mode or
368 a different type of mirror instead.
373 <group title="OpenFlow Configuration">
374 <column name="controller">
375 OpenFlow controller set. If unset, then no OpenFlow controllers
379 <column name="fail_mode">
380 <p>When a controller is configured, it is, ordinarily, responsible
381 for setting up all flows on the switch. Thus, if the connection to
382 the controller fails, no new network connections can be set up.
383 If the connection to the controller stays down long enough,
384 no packets can pass through the switch at all. This setting
385 determines the switch's response to such a situation. It may be set
386 to one of the following:
388 <dt><code>standalone</code></dt>
389 <dd>If no message is received from the controller for three
390 times the inactivity probe interval
391 (see <ref column="inactivity_probe"/>), then Open vSwitch
392 will take over responsibility for setting up flows. In
393 this mode, Open vSwitch causes the bridge to act like an
394 ordinary MAC-learning switch. Open vSwitch will continue
395 to retry connecting to the controller in the background
396 and, when the connection succeeds, it will discontinue its
397 standalone behavior.</dd>
398 <dt><code>secure</code></dt>
399 <dd>Open vSwitch will not set up flows on its own when the
400 controller connection fails or when no controllers are
401 defined. The bridge will continue to retry connecting to
402 any defined controllers forever.</dd>
405 <p>If this value is unset, the default is implementation-specific.</p>
406 <p>When more than one controller is configured,
407 <ref column="fail_mode"/> is considered only when none of the
408 configured controllers can be contacted.</p>
411 <column name="datapath_id">
412 Reports the OpenFlow datapath ID in use. Exactly 16 hex digits.
413 (Setting this column has no useful effect. Set <ref
414 column="other-config" key="datapath-id"/> instead.)
417 <column name="other_config" key="datapath-id">
418 Exactly 16 hex digits to set the OpenFlow datapath ID to a specific
419 value. May not be all-zero.
422 <column name="other_config" key="disable-in-band"
423 type='{"type": "boolean"}'>
424 If set to <code>true</code>, disable in-band control on the bridge
425 regardless of controller and manager settings.
428 <column name="other_config" key="in-band-queue"
429 type='{"type": "integer", "minInteger": 0, "maxInteger": 4294967295}'>
430 A queue ID as a nonnegative integer. This sets the OpenFlow queue ID
431 that will be used by flows set up by in-band control on this bridge.
432 If unset, or if the port used by an in-band control flow does not have
433 QoS configured, or if the port does not have a queue with the specified
434 ID, the default queue is used instead.
438 <group title="Spanning Tree Configuration">
439 The IEEE 802.1D Spanning Tree Protocol (STP) is a network protocol
440 that ensures loop-free topologies. It allows redundant links to
441 be included in the network to provide automatic backup paths if
442 the active links fails.
444 <column name="stp_enable">
445 Enable spanning tree on the bridge. By default, STP is disabled
446 on bridges. Bond, internal, and mirror ports are not supported
447 and will not participate in the spanning tree.
450 <column name="other_config" key="stp-system-id">
451 The bridge's STP identifier (the lower 48 bits of the bridge-id)
453 <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>.
454 By default, the identifier is the MAC address of the bridge.
457 <column name="other_config" key="stp-priority"
458 type='{"type": "integer", "minInteger": 0, "maxInteger": 65535}'>
459 The bridge's relative priority value for determining the root
460 bridge (the upper 16 bits of the bridge-id). A bridge with the
461 lowest bridge-id is elected the root. By default, the priority
465 <column name="other_config" key="stp-hello-time"
466 type='{"type": "integer", "minInteger": 1, "maxInteger": 10}'>
467 The interval between transmissions of hello messages by
468 designated ports, in seconds. By default the hello interval is
472 <column name="other_config" key="stp-max-age"
473 type='{"type": "integer", "minInteger": 6, "maxInteger": 40}'>
474 The maximum age of the information transmitted by the bridge
475 when it is the root bridge, in seconds. By default, the maximum
479 <column name="other_config" key="stp-forward-delay"
480 type='{"type": "integer", "minInteger": 4, "maxInteger": 30}'>
481 The delay to wait between transitioning root and designated
482 ports to <code>forwarding</code>, in seconds. By default, the
483 forwarding delay is 15 seconds.
487 <group title="Other Features">
488 <column name="datapath_type">
489 Name of datapath provider. The kernel datapath has
490 type <code>system</code>. The userspace datapath has
491 type <code>netdev</code>.
494 <column name="external_ids" key="bridge-id">
495 A unique identifier of the bridge. On Citrix XenServer this will
496 commonly be the same as
497 <ref column="external_ids" key="xs-network-uuids"/>.
500 <column name="external_ids" key="xs-network-uuids">
501 Semicolon-delimited set of universally unique identifier(s) for the
502 network with which this bridge is associated on a Citrix XenServer
503 host. The network identifiers are RFC 4122 UUIDs as displayed by,
504 e.g., <code>xe network-list</code>.
507 <column name="other_config" key="hwaddr">
508 An Ethernet address in the form
509 <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>
510 to set the hardware address of the local port and influence the
514 <column name="other_config" key="flow-eviction-threshold"
515 type='{"type": "integer", "minInteger": 0}'>
517 A number of flows as a nonnegative integer. This sets number of
518 flows at which eviction from the kernel flow table will be triggered.
519 If there are a large number of flows then increasing this value to
520 around the number of flows present can result in reduced CPU usage
524 The default is 1000. Values below 100 will be rounded up to 100.
528 <column name="other_config" key="forward-bpdu"
529 type='{"type": "boolean"}'>
530 Option to allow forwarding of BPDU frames when NORMAL action is
531 invoked. Frames with reserved Ethernet addresses (e.g. STP
532 BPDU) will be forwarded when this option is enabled and the
533 switch is not providing that functionality. If STP is enabled
534 on the port, STP BPDUs will never be forwarded. If the Open
535 vSwitch bridge is used to connect different Ethernet networks,
536 and if Open vSwitch node does not run STP, then this option
537 should be enabled. Default is disabled, set to
538 <code>true</code> to enable.
542 <group title="Bridge Status">
544 Status information about bridges.
546 <column name="status">
547 Key-value pairs that report bridge status.
549 <column name="status" key="stp_bridge_id">
551 The bridge-id (in hex) used in spanning tree advertisements.
552 Configuring the bridge-id is described in the
553 <code>stp-system-id</code> and <code>stp-priority</code> keys
554 of the <code>other_config</code> section earlier.
557 <column name="status" key="stp_designated_root">
559 The designated root (in hex) for this spanning tree.
562 <column name="status" key="stp_root_path_cost">
564 The path cost of reaching the designated bridge. A lower
570 <group title="Common Columns">
571 The overall purpose of these columns is described under <code>Common
572 Columns</code> at the beginning of this document.
574 <column name="other_config"/>
575 <column name="external_ids"/>
579 <table name="Port" table="Port or bond configuration.">
580 <p>A port within a <ref table="Bridge"/>.</p>
581 <p>Most commonly, a port has exactly one ``interface,'' pointed to by its
582 <ref column="interfaces"/> column. Such a port logically
583 corresponds to a port on a physical Ethernet switch. A port
584 with more than one interface is a ``bonded port'' (see
585 <ref group="Bonding Configuration"/>).</p>
586 <p>Some properties that one might think as belonging to a port are actually
587 part of the port's <ref table="Interface"/> members.</p>
590 Port name. Should be alphanumeric and no more than about 8
591 bytes long. May be the same as the interface name, for
592 non-bonded ports. Must otherwise be unique among the names of
593 ports, interfaces, and bridges on a host.
596 <column name="interfaces">
597 The port's interfaces. If there is more than one, this is a
601 <group title="VLAN Configuration">
602 <p>Bridge ports support the following types of VLAN configuration:</p>
607 A trunk port carries packets on one or more specified VLANs
608 specified in the <ref column="trunks"/> column (often, on every
609 VLAN). A packet that ingresses on a trunk port is in the VLAN
610 specified in its 802.1Q header, or VLAN 0 if the packet has no
611 802.1Q header. A packet that egresses through a trunk port will
612 have a 802.1Q header if it has a nonzero VLAN ID (or a nonzero
617 Any packet that ingresses on a trunk port tagged with a VLAN that
618 the port does not trunk is dropped.
625 An access port carries packets on exactly one VLAN specified in the
626 <ref column="tag"/> column. Packets ingressing and egressing on an
627 access port have no 802.1Q header.
631 Any packet with an 802.1Q header that ingresses on an access port
632 is dropped, regardless of whether the VLAN ID in the header is the
633 access port's VLAN ID.
637 <dt>native-tagged</dt>
639 A native-tagged port resembles a trunk port, with the exception that
640 a packet without an 802.1Q header that ingresses on a native-tagged
641 port is in the ``native VLAN'' (specified in the <ref column="tag"/>
645 <dt>native-untagged</dt>
647 A native-untagged port resembles a native-tagged port, with the
648 exception that a packet that egresses on a native-untagged port in
649 the native VLAN not have an 802.1Q header.
653 A packet will only egress through bridge ports that carry the VLAN of
654 the packet, as described by the rules above.
657 <column name="vlan_mode">
659 The VLAN mode of the port, as described above. When this column is
660 empty, a default mode is selected as follows:
664 If <ref column="tag"/> contains a value, the port is an access
665 port. The <ref column="trunks"/> column should be empty.
668 Otherwise, the port is a trunk port. The <ref column="trunks"/>
669 column value is honored if it is present.
676 For an access port, the port's implicitly tagged VLAN. For a
677 native-tagged or native-untagged port, the port's native VLAN. Must
678 be empty if this is a trunk port.
682 <column name="trunks">
684 For a trunk, native-tagged, or native-untagged port, the 802.1Q VLAN
685 or VLANs that this port trunks; if it is empty, then the port trunks
686 all VLANs. Must be empty if this is an access port.
689 A native-tagged or native-untagged port always trunks its native
690 VLAN, regardless of whether <ref column="trunks"/> includes that
696 <group title="Bonding Configuration">
697 <p>A port that has more than one interface is a ``bonded port.'' Bonding
698 allows for load balancing and fail-over. Some kinds of bonding will
699 work with any kind of upstream switch:</p>
702 <dt><code>balance-slb</code></dt>
704 Balances flows among slaves based on source MAC address and output
705 VLAN, with periodic rebalancing as traffic patterns change.
708 <dt><code>active-backup</code></dt>
710 Assigns all flows to one slave, failing over to a backup slave when
711 the active slave is disabled.
716 The following modes require the upstream switch to support 802.3ad with
717 successful LACP negotiation. If LACP negotiation fails then
718 <code>balance-slb</code> style flow hashing is used as a fallback:
722 <dt><code>balance-tcp</code></dt>
724 Balances flows among slaves based on L2, L3, and L4 protocol
725 information such as destination MAC address, IP address, and TCP
729 <dt><code>stable</code></dt>
731 <p>Attempts to always assign a given flow to the same slave
732 consistently. In an effort to maintain stability, no load
733 balancing is done. Uses a similar hashing strategy to
734 <code>balance-tcp</code>, always taking into account L3 and L4
735 fields even if LACP negotiations are unsuccessful. </p>
736 <p>Slave selection decisions are made based on <ref table="Interface"
737 column="other_config" key="bond-stable-id"/> if set. Otherwise,
738 OpenFlow port number is used. Decisions are consistent across all
739 <code>ovs-vswitchd</code> instances with equivalent
740 <ref table="Interface" column="other_config" key="bond-stable-id"/>
745 <p>These columns apply only to bonded ports. Their values are
746 otherwise ignored.</p>
748 <column name="bond_mode">
749 <p>The type of bonding used for a bonded port. Defaults to
750 <code>balance-slb</code> if unset.
754 <group title="Link Failure Detection">
756 An important part of link bonding is detecting that links are down so
757 that they may be disabled. These settings determine how Open vSwitch
758 detects link failure.
761 <column name="other_config" key="bond-detect-mode"
762 type='{"type": "string", "enum": ["set", ["carrier", "miimon"]]}'>
763 The means used to detect link failures. Defaults to
764 <code>carrier</code> which uses each interface's carrier to detect
765 failures. When set to <code>miimon</code>, will check for failures
766 by polling each interface's MII.
769 <column name="other_config" key="bond-miimon-interval"
770 type='{"type": "integer"}'>
771 The interval, in milliseconds, between successive attempts to poll
772 each interface's MII. Relevant only when <ref column="other_config"
773 key="bond-detect-mode"/> is <code>miimon</code>.
776 <column name="bond_updelay">
778 The number of milliseconds for which carrier must stay up on an
779 interface before the interface is considered to be up. Specify
780 <code>0</code> to enable the interface immediately.
784 This setting is honored only when at least one bonded interface is
785 already enabled. When no interfaces are enabled, then the first
786 bond interface to come up is enabled immediately.
790 <column name="bond_downdelay">
791 The number of milliseconds for which carrier must stay down on an
792 interface before the interface is considered to be down. Specify
793 <code>0</code> to disable the interface immediately.
797 <group title="LACP Configuration">
799 LACP, the Link Aggregation Control Protocol, is an IEEE standard that
800 allows switches to automatically detect that they are connected by
801 multiple links and aggregate across those links. These settings
802 control LACP behavior.
806 Configures LACP on this port. LACP allows directly connected
807 switches to negotiate which links may be bonded. LACP may be enabled
808 on non-bonded ports for the benefit of any switches they may be
809 connected to. <code>active</code> ports are allowed to initiate LACP
810 negotiations. <code>passive</code> ports are allowed to participate
811 in LACP negotiations initiated by a remote switch, but not allowed to
812 initiate such negotiations themselves. Defaults to <code>off</code>
816 <column name="other_config" key="lacp-system-id">
817 The LACP system ID of this <ref table="Port"/>. The system ID of a
818 LACP bond is used to identify itself to its partners. Must be a
822 <column name="other_config" key="lacp-system-priority"
823 type='{"type": "integer", "minInteger": 1, "maxInteger": 65535}'>
824 The LACP system priority of this <ref table="Port"/>. In LACP
825 negotiations, link status decisions are made by the system with the
826 numerically lower priority.
829 <column name="other_config" key="lacp-time">
831 The LACP timing which should be used on this <ref table="Port"/>.
832 Possible values are <code>fast</code>, <code>slow</code> and a
833 positive number of milliseconds. By default <code>slow</code> is
834 used. When configured to be <code>fast</code> LACP heartbeats are
835 requested at a rate of once per second causing connectivity
836 problems to be detected more quickly. In <code>slow</code> mode,
837 heartbeats are requested at a rate of once every 30 seconds.
841 Users may manually set a heartbeat transmission rate to increase
842 the fault detection speed further. When manually set, OVS expects
843 the partner switch to be configured with the same transmission
844 rate. Manually setting <code>lacp-time</code> to something other
845 than <code>fast</code> or <code>slow</code> is not supported by the
850 <column name="other_config" key="lacp-heartbeat"
851 type='{"type": "boolean"}'>
852 Treat LACP like a simple heartbeat protocol for link state
853 monitoring. Most features of the LACP protocol are disabled
854 when this mode is in use. The default if not specified is
858 <column name="other_config" key="bond-hash-basis"
859 type='{"type": "integer"}'>
860 An integer hashed along with flows when choosing output slaves. When
861 changed, all flows will be assigned different hash values possibly
862 causing slave selection decisions to change.
866 <group title="SLB Configuration">
868 These settings control behavior when a bond is in
869 <code>balance-slb</code> mode, regardless of whether the bond was
870 intentionally configured in SLB mode or it fell back to SLB mode
871 because LACP negotiation failed.
874 <column name="other_config" key="bond-rebalance-interval"
875 type='{"type": "integer", "minInteger": 1000, "maxInteger": 10000}'>
876 For an SLB bonded port, the number of milliseconds between successive
877 attempts to rebalance the bond, that is, to move source MACs and
878 their flows from one interface on the bond to another in an attempt
879 to keep usage of each interface roughly equal.
883 <column name="bond_fake_iface">
884 For a bonded port, whether to create a fake internal interface with the
885 name of the port. Use only for compatibility with legacy software that
890 <group title="Spanning Tree Configuration">
891 <column name="other_config" key="stp-enable"
892 type='{"type": "boolean"}'>
893 If spanning tree is enabled on the bridge, member ports are
894 enabled by default (with the exception of bond, internal, and
895 mirror ports which do not work with STP). If this column's
896 value is <code>false</code> spanning tree is disabled on the
900 <column name="other_config" key="stp-port-num"
901 type='{"type": "integer", "minInteger": 1, "maxInteger": 255}'>
902 The port number used for the lower 8 bits of the port-id. By
903 default, the numbers will be assigned automatically. If any
904 port's number is manually configured on a bridge, then they
908 <column name="other_config" key="stp-port-priority"
909 type='{"type": "integer", "minInteger": 0, "maxInteger": 255}'>
910 The port's relative priority value for determining the root
911 port (the upper 8 bits of the port-id). A port with a lower
912 port-id will be chosen as the root port. By default, the
916 <column name="other_config" key="stp-path-cost"
917 type='{"type": "integer", "minInteger": 0, "maxInteger": 65535}'>
918 Spanning tree path cost for the port. A lower number indicates
919 a faster link. By default, the cost is based on the maximum
924 <group title="Other Features">
926 Quality of Service configuration for this port.
930 The MAC address to use for this port for the purpose of choosing the
931 bridge's MAC address. This column does not necessarily reflect the
932 port's actual MAC address, nor will setting it change the port's actual
936 <column name="fake_bridge">
937 Does this port represent a sub-bridge for its tagged VLAN within the
938 Bridge? See ovs-vsctl(8) for more information.
941 <column name="external_ids" key="fake-bridge-id-*">
942 External IDs for a fake bridge (see the <ref column="fake_bridge"/>
943 column) are defined by prefixing a <ref table="Bridge"/> <ref
944 table="Bridge" column="external_ids"/> key with
945 <code>fake-bridge-</code>,
946 e.g. <code>fake-bridge-xs-network-uuids</code>.
950 <group title="Port Status">
952 Status information about ports attached to bridges.
954 <column name="status">
955 Key-value pairs that report port status.
957 <column name="status" key="stp_port_id">
959 The port-id (in hex) used in spanning tree advertisements for
960 this port. Configuring the port-id is described in the
961 <code>stp-port-num</code> and <code>stp-port-priority</code>
962 keys of the <code>other_config</code> section earlier.
965 <column name="status" key="stp_state"
966 type='{"type": "string", "enum": ["set",
967 ["disabled", "listening", "learning",
968 "forwarding", "blocking"]]}'>
970 STP state of the port.
973 <column name="status" key="stp_sec_in_state"
974 type='{"type": "integer", "minInteger": 0}'>
976 The amount of time (in seconds) port has been in the current
980 <column name="status" key="stp_role"
981 type='{"type": "string", "enum": ["set",
982 ["root", "designated", "alternate"]]}'>
984 STP role of the port.
989 <group title="Common Columns">
990 The overall purpose of these columns is described under <code>Common
991 Columns</code> at the beginning of this document.
993 <column name="other_config"/>
994 <column name="external_ids"/>
998 <table name="Interface" title="One physical network device in a Port.">
999 An interface within a <ref table="Port"/>.
1001 <group title="Core Features">
1002 <column name="name">
1003 Interface name. Should be alphanumeric and no more than about 8 bytes
1004 long. May be the same as the port name, for non-bonded ports. Must
1005 otherwise be unique among the names of ports, interfaces, and bridges
1010 <p>Ethernet address to set for this interface. If unset then the
1011 default MAC address is used:</p>
1013 <li>For the local interface, the default is the lowest-numbered MAC
1014 address among the other bridge ports, either the value of the
1015 <ref table="Port" column="mac"/> in its <ref table="Port"/> record,
1016 if set, or its actual MAC (for bonded ports, the MAC of its slave
1017 whose name is first in alphabetical order). Internal ports and
1018 bridge ports that are used as port mirroring destinations (see the
1019 <ref table="Mirror"/> table) are ignored.</li>
1020 <li>For other internal interfaces, the default MAC is randomly
1022 <li>External interfaces typically have a MAC address associated with
1023 their hardware.</li>
1025 <p>Some interfaces may not have a software-controllable MAC
1029 <column name="ofport">
1030 <p>OpenFlow port number for this interface. Unlike most columns, this
1031 column's value should be set only by Open vSwitch itself. Other
1032 clients should set this column to an empty set (the default) when
1033 creating an <ref table="Interface"/>.</p>
1034 <p>Open vSwitch populates this column when the port number becomes
1035 known. If the interface is successfully added,
1036 <ref column="ofport"/> will be set to a number between 1 and 65535
1037 (generally either in the range 1 to 65279, inclusive, or 65534, the
1038 port number for the OpenFlow ``local port''). If the interface
1039 cannot be added then Open vSwitch sets this column
1044 <group title="System-Specific Details">
1045 <column name="type">
1047 The interface type, one of:
1051 <dt><code>system</code></dt>
1052 <dd>An ordinary network device, e.g. <code>eth0</code> on Linux.
1053 Sometimes referred to as ``external interfaces'' since they are
1054 generally connected to hardware external to that on which the Open
1055 vSwitch is running. The empty string is a synonym for
1056 <code>system</code>.</dd>
1058 <dt><code>internal</code></dt>
1059 <dd>A simulated network device that sends and receives traffic. An
1060 internal interface whose <ref column="name"/> is the same as its
1061 bridge's <ref table="Open_vSwitch" column="name"/> is called the
1062 ``local interface.'' It does not make sense to bond an internal
1063 interface, so the terms ``port'' and ``interface'' are often used
1064 imprecisely for internal interfaces.</dd>
1066 <dt><code>tap</code></dt>
1067 <dd>A TUN/TAP device managed by Open vSwitch.</dd>
1069 <dt><code>gre</code></dt>
1071 An Ethernet over RFC 2890 Generic Routing Encapsulation over IPv4
1072 tunnel. See <ref group="Tunnel Options"/> for information on
1073 configuring GRE tunnels.
1076 <dt><code>ipsec_gre</code></dt>
1078 An Ethernet over RFC 2890 Generic Routing Encapsulation over IPv4
1082 <dt><code>capwap</code></dt>
1084 An Ethernet tunnel over the UDP transport portion of CAPWAP (RFC
1085 5415). This allows interoperability with certain switches that do
1086 not support GRE. Only the tunneling component of the protocol is
1087 implemented. UDP ports 58881 and 58882 are used as the source and
1088 destination ports respectively. CAPWAP is currently supported only
1089 with the Linux kernel datapath with kernel version 2.6.26 or later.
1092 <dt><code>patch</code></dt>
1094 A pair of virtual devices that act as a patch cable.
1097 <dt><code>null</code></dt>
1098 <dd>An ignored interface.</dd>
1103 <group title="Tunnel Options">
1105 These options apply to interfaces with <ref column="type"/> of
1106 <code>gre</code>, <code>ipsec_gre</code>, and <code>capwap</code>.
1110 Each tunnel must be uniquely identified by the combination of <ref
1111 column="type"/>, <ref column="options" key="remote_ip"/>, <ref
1112 column="options" key="local_ip"/>, and <ref column="options"
1113 key="in_key"/>. If two ports are defined that are the same except one
1114 has an optional identifier and the other does not, the more specific
1115 one is matched first. <ref column="options" key="in_key"/> is
1116 considered more specific than <ref column="options" key="local_ip"/> if
1117 a port defines one and another port defines the other.
1120 <column name="options" key="remote_ip">
1122 Required. The tunnel endpoint. Unicast and multicast endpoints are
1127 When a multicast endpoint is specified, a routing table lookup occurs
1128 only when the tunnel is created. Following a routing change, delete
1129 and then re-create the tunnel to force a new routing table lookup.
1133 <column name="options" key="local_ip">
1134 Optional. The destination IP that received packets must match.
1135 Default is to match all addresses. Must be omitted when <ref
1136 column="options" key="remote_ip"/> is a multicast address.
1139 <column name="options" key="in_key">
1140 <p>Optional. The key that received packets must contain, one of:</p>
1144 <code>0</code>. The tunnel receives packets with no key or with a
1145 key of 0. This is equivalent to specifying no <ref column="options"
1146 key="in_key"/> at all.
1149 A positive 32-bit (for GRE) or 64-bit (for CAPWAP) number. The
1150 tunnel receives only packets with the specified key.
1153 The word <code>flow</code>. The tunnel accepts packets with any
1154 key. The key will be placed in the <code>tun_id</code> field for
1155 matching in the flow table. The <code>ovs-ofctl</code> manual page
1156 contains additional information about matching fields in OpenFlow
1165 <column name="options" key="out_key">
1166 <p>Optional. The key to be set on outgoing packets, one of:</p>
1170 <code>0</code>. Packets sent through the tunnel will have no key.
1171 This is equivalent to specifying no <ref column="options"
1172 key="out_key"/> at all.
1175 A positive 32-bit (for GRE) or 64-bit (for CAPWAP) number. Packets
1176 sent through the tunnel will have the specified key.
1179 The word <code>flow</code>. Packets sent through the tunnel will
1180 have the key set using the <code>set_tunnel</code> Nicira OpenFlow
1181 vendor extension (0 is used in the absence of an action). The
1182 <code>ovs-ofctl</code> manual page contains additional information
1183 about the Nicira OpenFlow vendor extensions.
1188 <column name="options" key="key">
1189 Optional. Shorthand to set <code>in_key</code> and
1190 <code>out_key</code> at the same time.
1193 <column name="options" key="tos">
1194 Optional. The value of the ToS bits to be set on the encapsulating
1195 packet. It may also be the word <code>inherit</code>, in which case
1196 the ToS will be copied from the inner packet if it is IPv4 or IPv6
1197 (otherwise it will be 0). The ECN fields are always inherited.
1201 <column name="options" key="ttl">
1202 Optional. The TTL to be set on the encapsulating packet. It may also
1203 be the word <code>inherit</code>, in which case the TTL will be copied
1204 from the inner packet if it is IPv4 or IPv6 (otherwise it will be the
1205 system default, typically 64). Default is the system default TTL.
1208 <column name="options" key="df_inherit" type='{"type": "boolean"}'>
1209 Optional. If enabled, the Don't Fragment bit will be copied from the
1210 inner IP headers (those of the encapsulated traffic) to the outer
1211 (tunnel) headers. Default is disabled; set to <code>true</code> to
1215 <column name="options" key="df_default"
1216 type='{"type": "boolean"}'>
1217 Optional. If enabled, the Don't Fragment bit will be set by default on
1218 tunnel headers if the <code>df_inherit</code> option is not set, or if
1219 the encapsulated packet is not IP. Default is enabled; set to
1220 <code>false</code> to disable.
1223 <column name="options" key="pmtud" type='{"type": "boolean"}'>
1224 Optional. Enable tunnel path MTU discovery. If enabled ``ICMP
1225 Destination Unreachable - Fragmentation Needed'' messages will be
1226 generated for IPv4 packets with the DF bit set and IPv6 packets above
1227 the minimum MTU if the packet size exceeds the path MTU minus the size
1228 of the tunnel headers. Note that this option causes behavior that is
1229 typically reserved for routers and therefore is not entirely in
1230 compliance with the IEEE 802.1D specification for bridges. Default is
1231 enabled; set to <code>false</code> to disable.
1234 <group title="Tunnel Options: gre only">
1236 Only <code>gre</code> interfaces support these options.
1239 <column name="options" key="header_cache" type='{"type": "boolean"}'>
1240 Enable caching of tunnel headers and the output path. This can lead
1241 to a significant performance increase without changing behavior. In
1242 general it should not be necessary to adjust this setting. However,
1243 the caching can bypass certain components of the IP stack (such as
1244 <code>iptables</code>) and it may be useful to disable it if these
1245 features are required or as a debugging measure. Default is enabled,
1246 set to <code>false</code> to disable.
1250 <group title="Tunnel Options: gre and ipsec_gre only">
1252 Only <code>gre</code> and <code>ipsec_gre</code> interfaces support
1256 <column name="options" key="csum" type='{"type": "boolean"}'>
1258 Optional. Compute GRE checksums on outgoing packets. Default is
1259 disabled, set to <code>true</code> to enable. Checksums present on
1260 incoming packets will be validated regardless of this setting.
1264 GRE checksums impose a significant performance penalty because they
1265 cover the entire packet. The encapsulated L3, L4, and L7 packet
1266 contents typically have their own checksums, so this additional
1267 checksum only adds value for the GRE and encapsulated L2 headers.
1271 This option is supported for <code>ipsec_gre</code>, but not useful
1272 because GRE checksums are weaker than, and redundant with, IPsec
1273 payload authentication.
1278 <group title="Tunnel Options: ipsec_gre only">
1280 Only <code>ipsec_gre</code> interfaces support these options.
1283 <column name="options" key="peer_cert">
1284 Required for certificate authentication. A string containing the
1285 peer's certificate in PEM format. Additionally the host's
1286 certificate must be specified with the <code>certificate</code>
1290 <column name="options" key="certificate">
1291 Required for certificate authentication. The name of a PEM file
1292 containing a certificate that will be presented to the peer during
1296 <column name="options" key="private_key">
1297 Optional for certificate authentication. The name of a PEM file
1298 containing the private key associated with <code>certificate</code>.
1299 If <code>certificate</code> contains the private key, this option may
1303 <column name="options" key="psk">
1304 Required for pre-shared key authentication. Specifies a pre-shared
1305 key for authentication that must be identical on both sides of the
1311 <group title="Patch Options">
1313 Only <code>patch</code> interfaces support these options.
1316 <column name="options" key="peer">
1317 The <ref column="name"/> of the <ref table="Interface"/> for the other
1318 side of the patch. The named <ref table="Interface"/>'s own
1319 <code>peer</code> option must specify this <ref table="Interface"/>'s
1320 name. That is, the two patch interfaces must have reversed <ref
1321 column="name"/> and <code>peer</code> values.
1325 <group title="Interface Status">
1327 Status information about interfaces attached to bridges, updated every
1328 5 seconds. Not all interfaces have all of these properties; virtual
1329 interfaces don't have a link speed, for example. Non-applicable
1330 columns will have empty values.
1332 <column name="admin_state">
1334 The administrative state of the physical network link.
1338 <column name="link_state">
1340 The observed state of the physical network link. This is ordinarily
1341 the link's carrier status. If the interface's <ref table="Port"/> is
1342 a bond configured for miimon monitoring, it is instead the network
1343 link's miimon status.
1347 <column name="link_resets">
1349 The number of times Open vSwitch has observed the
1350 <ref column="link_state"/> of this <ref table="Interface"/> change.
1354 <column name="link_speed">
1356 The negotiated speed of the physical network link.
1357 Valid values are positive integers greater than 0.
1361 <column name="duplex">
1363 The duplex mode of the physical network link.
1369 The MTU (maximum transmission unit); i.e. the largest
1370 amount of data that can fit into a single Ethernet frame.
1371 The standard Ethernet MTU is 1500 bytes. Some physical media
1372 and many kinds of virtual interfaces can be configured with
1376 This column will be empty for an interface that does not
1377 have an MTU as, for example, some kinds of tunnels do not.
1381 <column name="lacp_current">
1382 Boolean value indicating LACP status for this interface. If true, this
1383 interface has current LACP information about its LACP partner. This
1384 information may be used to monitor the health of interfaces in a LACP
1385 enabled port. This column will be empty if LACP is not enabled.
1388 <column name="status">
1389 Key-value pairs that report port status. Supported status values are
1390 <ref column="type"/>-dependent; some interfaces may not have a valid
1391 <ref column="status" key="driver_name"/>, for example.
1394 <column name="status" key="driver_name">
1395 The name of the device driver controlling the network adapter.
1398 <column name="status" key="driver_version">
1399 The version string of the device driver controlling the network
1403 <column name="status" key="firmware_version">
1404 The version string of the network adapter's firmware, if available.
1407 <column name="status" key="source_ip">
1408 The source IP address used for an IPv4 tunnel end-point, such as
1409 <code>gre</code> or <code>capwap</code>.
1412 <column name="status" key="tunnel_egress_iface">
1413 Egress interface for tunnels. Currently only relevant for GRE and
1414 CAPWAP tunnels. On Linux systems, this column will show the name of
1415 the interface which is responsible for routing traffic destined for the
1416 configured <ref column="options" key="remote_ip"/>. This could be an
1417 internal interface such as a bridge port.
1420 <column name="status" key="tunnel_egress_iface_carrier"
1421 type='{"type": "string", "enum": ["set", ["down", "up"]]}'>
1422 Whether carrier is detected on <ref column="status"
1423 key="tunnel_egress_iface"/>.
1427 <group title="Statistics">
1429 Key-value pairs that report interface statistics. The current
1430 implementation updates these counters periodically. Future
1431 implementations may update them when an interface is created, when they
1432 are queried (e.g. using an OVSDB <code>select</code> operation), and
1433 just before an interface is deleted due to virtual interface hot-unplug
1434 or VM shutdown, and perhaps at other times, but not on any regular
1438 These are the same statistics reported by OpenFlow in its <code>struct
1439 ofp_port_stats</code> structure. If an interface does not support a
1440 given statistic, then that pair is omitted.
1442 <group title="Statistics: Successful transmit and receive counters">
1443 <column name="statistics" key="rx_packets">
1444 Number of received packets.
1446 <column name="statistics" key="rx_bytes">
1447 Number of received bytes.
1449 <column name="statistics" key="tx_packets">
1450 Number of transmitted packets.
1452 <column name="statistics" key="tx_bytes">
1453 Number of transmitted bytes.
1456 <group title="Statistics: Receive errors">
1457 <column name="statistics" key="rx_dropped">
1458 Number of packets dropped by RX.
1460 <column name="statistics" key="rx_frame_err">
1461 Number of frame alignment errors.
1463 <column name="statistics" key="rx_over_err">
1464 Number of packets with RX overrun.
1466 <column name="statistics" key="rx_crc_err">
1467 Number of CRC errors.
1469 <column name="statistics" key="rx_errors">
1470 Total number of receive errors, greater than or equal to the sum of
1474 <group title="Statistics: Transmit errors">
1475 <column name="statistics" key="tx_dropped">
1476 Number of packets dropped by TX.
1478 <column name="statistics" key="collisions">
1479 Number of collisions.
1481 <column name="statistics" key="tx_errors">
1482 Total number of transmit errors, greater than or equal to the sum of
1488 <group title="Ingress Policing">
1490 These settings control ingress policing for packets received on this
1491 interface. On a physical interface, this limits the rate at which
1492 traffic is allowed into the system from the outside; on a virtual
1493 interface (one connected to a virtual machine), this limits the rate at
1494 which the VM is able to transmit.
1497 Policing is a simple form of quality-of-service that simply drops
1498 packets received in excess of the configured rate. Due to its
1499 simplicity, policing is usually less accurate and less effective than
1500 egress QoS (which is configured using the <ref table="QoS"/> and <ref
1501 table="Queue"/> tables).
1504 Policing is currently implemented only on Linux. The Linux
1505 implementation uses a simple ``token bucket'' approach:
1509 The size of the bucket corresponds to <ref
1510 column="ingress_policing_burst"/>. Initially the bucket is full.
1513 Whenever a packet is received, its size (converted to tokens) is
1514 compared to the number of tokens currently in the bucket. If the
1515 required number of tokens are available, they are removed and the
1516 packet is forwarded. Otherwise, the packet is dropped.
1519 Whenever it is not full, the bucket is refilled with tokens at the
1520 rate specified by <ref column="ingress_policing_rate"/>.
1524 Policing interacts badly with some network protocols, and especially
1525 with fragmented IP packets. Suppose that there is enough network
1526 activity to keep the bucket nearly empty all the time. Then this token
1527 bucket algorithm will forward a single packet every so often, with the
1528 period depending on packet size and on the configured rate. All of the
1529 fragments of an IP packets are normally transmitted back-to-back, as a
1530 group. In such a situation, therefore, only one of these fragments
1531 will be forwarded and the rest will be dropped. IP does not provide
1532 any way for the intended recipient to ask for only the remaining
1533 fragments. In such a case there are two likely possibilities for what
1534 will happen next: either all of the fragments will eventually be
1535 retransmitted (as TCP will do), in which case the same problem will
1536 recur, or the sender will not realize that its packet has been dropped
1537 and data will simply be lost (as some UDP-based protocols will do).
1538 Either way, it is possible that no forward progress will ever occur.
1540 <column name="ingress_policing_rate">
1542 Maximum rate for data received on this interface, in kbps. Data
1543 received faster than this rate is dropped. Set to <code>0</code>
1544 (the default) to disable policing.
1548 <column name="ingress_policing_burst">
1549 <p>Maximum burst size for data received on this interface, in kb. The
1550 default burst size if set to <code>0</code> is 1000 kb. This value
1551 has no effect if <ref column="ingress_policing_rate"/>
1552 is <code>0</code>.</p>
1554 Specifying a larger burst size lets the algorithm be more forgiving,
1555 which is important for protocols like TCP that react severely to
1556 dropped packets. The burst size should be at least the size of the
1557 interface's MTU. Specifying a value that is numerically at least as
1558 large as 10% of <ref column="ingress_policing_rate"/> helps TCP come
1559 closer to achieving the full rate.
1564 <group title="Connectivity Fault Management">
1566 802.1ag Connectivity Fault Management (CFM) allows a group of
1567 Maintenance Points (MPs) called a Maintenance Association (MA) to
1568 detect connectivity problems with each other. MPs within a MA should
1569 have complete and exclusive interconnectivity. This is verified by
1570 occasionally broadcasting Continuity Check Messages (CCMs) at a
1571 configurable transmission interval.
1575 According to the 802.1ag specification, each Maintenance Point should
1576 be configured out-of-band with a list of Remote Maintenance Points it
1577 should have connectivity to. Open vSwitch differs from the
1578 specification in this area. It simply assumes the link is faulted if
1579 no Remote Maintenance Points are reachable, and considers it not
1583 <column name="cfm_mpid">
1584 A Maintenance Point ID (MPID) uniquely identifies each endpoint within
1585 a Maintenance Association. The MPID is used to identify this endpoint
1586 to other Maintenance Points in the MA. Each end of a link being
1587 monitored should have a different MPID. Must be configured to enable
1588 CFM on this <ref table="Interface"/>.
1591 <column name="cfm_fault">
1593 Indicates a connectivity fault triggered by an inability to receive
1594 heartbeats from any remote endpoint. When a fault is triggered on
1595 <ref table="Interface"/>s participating in bonds, they will be
1599 Faults can be triggered for several reasons. Most importantly they
1600 are triggered when no CCMs are received for a period of 3.5 times the
1601 transmission interval. Faults are also triggered when any CCMs
1602 indicate that a Remote Maintenance Point is not receiving CCMs but
1603 able to send them. Finally, a fault is triggered if a CCM is
1604 received which indicates unexpected configuration. Notably, this
1605 case arises when a CCM is received which advertises the local MPID.
1609 <column name="cfm_remote_mpids">
1610 When CFM is properly configured, Open vSwitch will occasionally
1611 receive CCM broadcasts. These broadcasts contain the MPID of the
1612 sending Maintenance Point. The list of MPIDs from which this
1613 <ref table="Interface"/> is receiving broadcasts from is regularly
1614 collected and written to this column.
1617 <column name="other_config" key="cfm_interval"
1618 type='{"type": "integer"}'>
1619 The interval, in milliseconds, between transmissions of CFM heartbeats.
1620 Three missed heartbeat receptions indicate a connectivity fault.
1624 <column name="other_config" key="cfm_extended"
1625 type='{"type": "boolean"}'>
1626 When <code>true</code>, the CFM module operates in extended mode. This
1627 causes it to use a nonstandard destination address to avoid conflicting
1628 with compliant implementations which may be running concurrently on the
1629 network. Furthermore, extended mode increases the accuracy of the
1630 <code>cfm_interval</code> configuration parameter by breaking wire
1631 compatibility with 802.1ag compliant implementations. Defaults to
1634 <column name="other_config" key="cfm_opstate"
1635 type='{"type": "string", "enum": ["set", ["down", "up"]]}'>
1636 When <code>down</code>, the CFM module marks all CCMs it generates as
1637 operationally down without triggering a fault. This allows remote
1638 maintenance points to choose not to forward traffic to the
1639 <ref table="Interface"/> on which this CFM module is running.
1640 Currently, in Open vSwitch, the opdown bit of CCMs affects
1641 <ref table="Interface"/>s participating in bonds, and the bundle
1642 OpenFlow action. This setting is ignored when CFM is not in extended
1643 mode. Defaults to <code>up</code>.
1647 <group title="Bonding Configuration">
1648 <column name="other_config" key="bond-stable-id"
1649 type='{"type": "integer", "minInteger": 1}'>
1650 Used in <code>stable</code> bond mode to make slave
1651 selection decisions. Allocating <ref column="other_config"
1652 key="bond-stable-id"/> values consistently across interfaces
1653 participating in a bond will guarantee consistent slave selection
1654 decisions across <code>ovs-vswitchd</code> instances when using
1655 <code>stable</code> bonding mode.
1658 <column name="other_config" key="lacp-port-id"
1659 type='{"type": "integer", "minInteger": 1, "maxInteger": 65535}'>
1660 The LACP port ID of this <ref table="Interface"/>. Port IDs are
1661 used in LACP negotiations to identify individual ports
1662 participating in a bond.
1665 <column name="other_config" key="lacp-port-priority"
1666 type='{"type": "integer", "minInteger": 1, "maxInteger": 65535}'>
1667 The LACP port priority of this <ref table="Interface"/>. In LACP
1668 negotiations <ref table="Interface"/>s with numerically lower
1669 priorities are preferred for aggregation.
1672 <column name="other_config" key="lacp-aggregation-key"
1673 type='{"type": "integer", "minInteger": 1, "maxInteger": 65535}'>
1674 The LACP aggregation key of this <ref table="Interface"/>. <ref
1675 table="Interface"/>s with different aggregation keys may not be active
1676 within a given <ref table="Port"/> at the same time.
1680 <group title="Virtual Machine Identifiers">
1682 These key-value pairs specifically apply to an interface that
1683 represents a virtual Ethernet interface connected to a virtual
1684 machine. These key-value pairs should not be present for other types
1685 of interfaces. Keys whose names end in <code>-uuid</code> have
1686 values that uniquely identify the entity in question. For a Citrix
1687 XenServer hypervisor, these values are UUIDs in RFC 4122 format.
1688 Other hypervisors may use other formats.
1691 <column name="external_ids" key="attached-mac">
1692 The MAC address programmed into the ``virtual hardware'' for this
1693 interface, in the form
1694 <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>.
1695 For Citrix XenServer, this is the value of the <code>MAC</code> field
1696 in the VIF record for this interface.
1699 <column name="external_ids" key="iface-id">
1700 A system-unique identifier for the interface. On XenServer, this will
1701 commonly be the same as <ref column="external_ids" key="xs-vif-uuid"/>.
1704 <column name="external_ids" key="xs-vif-uuid">
1705 The virtual interface associated with this interface.
1708 <column name="external_ids" key="xs-network-uuid">
1709 The virtual network to which this interface is attached.
1712 <column name="external_ids" key="xs-vm-uuid">
1713 The VM to which this interface belongs.
1717 <group title="Common Columns">
1718 The overall purpose of these columns is described under <code>Common
1719 Columns</code> at the beginning of this document.
1721 <column name="other_config"/>
1722 <column name="external_ids"/>
1726 <table name="QoS" title="Quality of Service configuration">
1727 <p>Quality of Service (QoS) configuration for each Port that
1730 <column name="type">
1731 <p>The type of QoS to implement. The <ref table="Open_vSwitch"
1732 column="capabilities"/> column in the <ref table="Open_vSwitch"/> table
1733 identifies the types that a switch actually supports. The currently
1734 defined types are listed below:</p>
1736 <dt><code>linux-htb</code></dt>
1738 Linux ``hierarchy token bucket'' classifier. See tc-htb(8) (also at
1739 <code>http://linux.die.net/man/8/tc-htb</code>) and the HTB manual
1740 (<code>http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm</code>)
1741 for information on how this classifier works and how to configure it.
1745 <dt><code>linux-hfsc</code></dt>
1747 Linux "Hierarchical Fair Service Curve" classifier.
1748 See <code>http://linux-ip.net/articles/hfsc.en/</code> for
1749 information on how this classifier works.
1754 <column name="queues">
1755 <p>A map from queue numbers to <ref table="Queue"/> records. The
1756 supported range of queue numbers depend on <ref column="type"/>. The
1757 queue numbers are the same as the <code>queue_id</code> used in
1758 OpenFlow in <code>struct ofp_action_enqueue</code> and other
1759 structures. Queue 0 is used by OpenFlow output actions that do not
1760 specify a specific queue.</p>
1763 <group title="Configuration for linux-htb and linux-hfsc">
1765 The <code>linux-htb</code> and <code>linux-hfsc</code> classes support
1766 the following key-value pair:
1769 <column name="other_config" key="max-rate" type='{"type": "integer"}'>
1770 Maximum rate shared by all queued traffic, in bit/s. Optional. If not
1771 specified, for physical interfaces, the default is the link rate. For
1772 other interfaces or if the link rate cannot be determined, the default
1773 is currently 100 Mbps.
1777 <group title="Common Columns">
1778 The overall purpose of these columns is described under <code>Common
1779 Columns</code> at the beginning of this document.
1781 <column name="other_config"/>
1782 <column name="external_ids"/>
1786 <table name="Queue" title="QoS output queue.">
1787 <p>A configuration for a port output queue, used in configuring Quality of
1788 Service (QoS) features. May be referenced by <ref column="queues"
1789 table="QoS"/> column in <ref table="QoS"/> table.</p>
1791 <group title="Configuration for min-rate QoS">
1793 These key-value pairs are defined for <ref table="QoS"/> <ref
1794 table="QoS" column="type"/> of <code>min-rate</code>.
1797 <column name="other_config" key="min-rate"
1798 type='{"type": "integer", "minInteger": 12000}'>
1799 Minimum guaranteed bandwidth, in bit/s. Required. The floor value is
1800 1500 bytes/s (12,000 bit/s).
1804 <group title="Configuration for linux-htb QoS">
1806 These key-value pairs are defined for <ref table="QoS"/> <ref
1807 table="QoS" column="type"/> of <code>linux-htb</code>.
1810 <column name="other_config" key="min-rate"
1811 type='{"type": "integer", "minInteger": 1}'>
1812 Minimum guaranteed bandwidth, in bit/s.
1815 <column name="other_config" key="max-rate"
1816 type='{"type": "integer", "minInteger": 1}'>
1817 Maximum allowed bandwidth, in bit/s. Optional. If specified, the
1818 queue's rate will not be allowed to exceed the specified value, even
1819 if excess bandwidth is available. If unspecified, defaults to no
1823 <column name="other_config" key="burst"
1824 type='{"type": "integer", "minInteger": 1}'>
1825 Burst size, in bits. This is the maximum amount of ``credits'' that a
1826 queue can accumulate while it is idle. Optional. Details of the
1827 <code>linux-htb</code> implementation require a minimum burst size, so
1828 a too-small <code>burst</code> will be silently ignored.
1831 <column name="other_config" key="priority"
1832 type='{"type": "integer", "minInteger": 0, "maxInteger": 4294967295}'>
1833 A queue with a smaller <code>priority</code> will receive all the
1834 excess bandwidth that it can use before a queue with a larger value
1835 receives any. Specific priority values are unimportant; only relative
1836 ordering matters. Defaults to 0 if unspecified.
1840 <group title="Configuration for linux-hfsc QoS">
1842 These key-value pairs are defined for <ref table="QoS"/> <ref
1843 table="QoS" column="type"/> of <code>linux-hfsc</code>.
1846 <column name="other_config" key="min-rate"
1847 type='{"type": "integer", "minInteger": 1}'>
1848 Minimum guaranteed bandwidth, in bit/s.
1851 <column name="other_config" key="max-rate"
1852 type='{"type": "integer", "minInteger": 1}'>
1853 Maximum allowed bandwidth, in bit/s. Optional. If specified, the
1854 queue's rate will not be allowed to exceed the specified value, even if
1855 excess bandwidth is available. If unspecified, defaults to no
1860 <group title="Common Columns">
1861 The overall purpose of these columns is described under <code>Common
1862 Columns</code> at the beginning of this document.
1864 <column name="other_config"/>
1865 <column name="external_ids"/>
1869 <table name="Mirror" title="Port mirroring (SPAN/RSPAN/ERSPAN).">
1870 <p>A port mirror within a <ref table="Bridge"/>.</p>
1871 <p>A port mirror configures a bridge to send selected frames to special
1872 ``mirrored'' ports, in addition to their normal destinations. Mirroring
1873 traffic may also be referred to as SPAN, RSPAN, or ERSPAN, depending on how
1874 the mirrored traffic is sent.</p>
1876 <column name="name">
1877 Arbitrary identifier for the <ref table="Mirror"/>.
1880 <group title="Selecting Packets for Mirroring">
1882 To be selected for mirroring, a given packet must enter or leave the
1883 bridge through a selected port and it must also be in one of the
1887 <column name="select_all">
1888 If true, every packet arriving or departing on any port is
1889 selected for mirroring.
1892 <column name="select_dst_port">
1893 Ports on which departing packets are selected for mirroring.
1896 <column name="select_src_port">
1897 Ports on which arriving packets are selected for mirroring.
1900 <column name="select_vlan">
1901 VLANs on which packets are selected for mirroring. An empty set
1902 selects packets on all VLANs.
1906 <group title="Mirroring Destination Configuration">
1908 These columns are mutually exclusive. Exactly one of them must be
1912 <column name="output_port">
1913 <p>Output port for selected packets, if nonempty.</p>
1914 <p>Specifying a port for mirror output reserves that port exclusively
1915 for mirroring. No frames other than those selected for mirroring
1916 will be forwarded to the port, and any frames received on the port
1917 will be discarded.</p>
1919 The output port may be any kind of port supported by Open vSwitch.
1920 It may be, for example, a physical port (sometimes called SPAN), or a
1921 GRE tunnel (sometimes called ERSPAN).
1925 <column name="output_vlan">
1926 <p>Output VLAN for selected packets, if nonempty.</p>
1927 <p>The frames will be sent out all ports that trunk
1928 <ref column="output_vlan"/>, as well as any ports with implicit VLAN
1929 <ref column="output_vlan"/>. When a mirrored frame is sent out a
1930 trunk port, the frame's VLAN tag will be set to
1931 <ref column="output_vlan"/>, replacing any existing tag; when it is
1932 sent out an implicit VLAN port, the frame will not be tagged. This
1933 type of mirroring is sometimes called RSPAN.</p>
1935 The following destination MAC addresses will not be mirrored to a
1936 VLAN to avoid confusing switches that interpret the protocols that
1940 <dt><code>01:80:c2:00:00:00</code></dt>
1941 <dd>IEEE 802.1D Spanning Tree Protocol (STP).</dd>
1943 <dt><code>01:80:c2:00:00:01</code></dt>
1944 <dd>IEEE Pause frame.</dd>
1946 <dt><code>01:80:c2:00:00:0<var>x</var></code></dt>
1947 <dd>Other reserved protocols.</dd>
1949 <dt><code>01:00:0c:cc:cc:cc</code></dt>
1951 Cisco Discovery Protocol (CDP), VLAN Trunking Protocol (VTP),
1952 Dynamic Trunking Protocol (DTP), Port Aggregation Protocol (PAgP),
1956 <dt><code>01:00:0c:cc:cc:cd</code></dt>
1957 <dd>Cisco Shared Spanning Tree Protocol PVSTP+.</dd>
1959 <dt><code>01:00:0c:cd:cd:cd</code></dt>
1960 <dd>Cisco STP Uplink Fast.</dd>
1962 <dt><code>01:00:0c:00:00:00</code></dt>
1963 <dd>Cisco Inter Switch Link.</dd>
1965 <p><em>Please note:</em> Mirroring to a VLAN can disrupt a network that
1966 contains unmanaged switches. Consider an unmanaged physical switch
1967 with two ports: port 1, connected to an end host, and port 2,
1968 connected to an Open vSwitch configured to mirror received packets
1969 into VLAN 123 on port 2. Suppose that the end host sends a packet on
1970 port 1 that the physical switch forwards to port 2. The Open vSwitch
1971 forwards this packet to its destination and then reflects it back on
1972 port 2 in VLAN 123. This reflected packet causes the unmanaged
1973 physical switch to replace the MAC learning table entry, which
1974 correctly pointed to port 1, with one that incorrectly points to port
1975 2. Afterward, the physical switch will direct packets destined for
1976 the end host to the Open vSwitch on port 2, instead of to the end
1977 host on port 1, disrupting connectivity. If mirroring to a VLAN is
1978 desired in this scenario, then the physical switch must be replaced
1979 by one that learns Ethernet addresses on a per-VLAN basis. In
1980 addition, learning should be disabled on the VLAN containing mirrored
1981 traffic. If this is not done then intermediate switches will learn
1982 the MAC address of each end host from the mirrored traffic. If
1983 packets being sent to that end host are also mirrored, then they will
1984 be dropped since the switch will attempt to send them out the input
1985 port. Disabling learning for the VLAN will cause the switch to
1986 correctly send the packet out all ports configured for that VLAN. If
1987 Open vSwitch is being used as an intermediate switch, learning can be
1988 disabled by adding the mirrored VLAN to <ref column="flood_vlans"/>
1989 in the appropriate <ref table="Bridge"/> table or tables.</p>
1991 Mirroring to a GRE tunnel has fewer caveats than mirroring to a
1992 VLAN and should generally be preferred.
1997 <group title="Common Columns">
1998 The overall purpose of these columns is described under <code>Common
1999 Columns</code> at the beginning of this document.
2001 <column name="external_ids"/>
2005 <table name="Controller" title="OpenFlow controller configuration.">
2006 <p>An OpenFlow controller.</p>
2009 Open vSwitch supports two kinds of OpenFlow controllers:
2013 <dt>Primary controllers</dt>
2016 This is the kind of controller envisioned by the OpenFlow 1.0
2017 specification. Usually, a primary controller implements a network
2018 policy by taking charge of the switch's flow table.
2022 Open vSwitch initiates and maintains persistent connections to
2023 primary controllers, retrying the connection each time it fails or
2024 drops. The <ref table="Bridge" column="fail_mode"/> column in the
2025 <ref table="Bridge"/> table applies to primary controllers.
2029 Open vSwitch permits a bridge to have any number of primary
2030 controllers. When multiple controllers are configured, Open
2031 vSwitch connects to all of them simultaneously. Because
2032 OpenFlow 1.0 does not specify how multiple controllers
2033 coordinate in interacting with a single switch, more than
2034 one primary controller should be specified only if the
2035 controllers are themselves designed to coordinate with each
2036 other. (The Nicira-defined <code>NXT_ROLE</code> OpenFlow
2037 vendor extension may be useful for this.)
2040 <dt>Service controllers</dt>
2043 These kinds of OpenFlow controller connections are intended for
2044 occasional support and maintenance use, e.g. with
2045 <code>ovs-ofctl</code>. Usually a service controller connects only
2046 briefly to inspect or modify some of a switch's state.
2050 Open vSwitch listens for incoming connections from service
2051 controllers. The service controllers initiate and, if necessary,
2052 maintain the connections from their end. The <ref table="Bridge"
2053 column="fail_mode"/> column in the <ref table="Bridge"/> table does
2054 not apply to service controllers.
2058 Open vSwitch supports configuring any number of service controllers.
2064 The <ref column="target"/> determines the type of controller.
2067 <group title="Core Features">
2068 <column name="target">
2069 <p>Connection method for controller.</p>
2071 The following connection methods are currently supported for primary
2075 <dt><code>ssl:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
2077 <p>The specified SSL <var>port</var> (default: 6633) on the host at
2078 the given <var>ip</var>, which must be expressed as an IP address
2079 (not a DNS name). The <ref table="Open_vSwitch" column="ssl"/>
2080 column in the <ref table="Open_vSwitch"/> table must point to a
2081 valid SSL configuration when this form is used.</p>
2082 <p>SSL support is an optional feature that is not always built as
2083 part of Open vSwitch.</p>
2085 <dt><code>tcp:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
2086 <dd>The specified TCP <var>port</var> (default: 6633) on the host at
2087 the given <var>ip</var>, which must be expressed as an IP address
2088 (not a DNS name).</dd>
2091 The following connection methods are currently supported for service
2095 <dt><code>pssl:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
2098 Listens for SSL connections on the specified TCP <var>port</var>
2099 (default: 6633). If <var>ip</var>, which must be expressed as an
2100 IP address (not a DNS name), is specified, then connections are
2101 restricted to the specified local IP address.
2104 The <ref table="Open_vSwitch" column="ssl"/> column in the <ref
2105 table="Open_vSwitch"/> table must point to a valid SSL
2106 configuration when this form is used.
2108 <p>SSL support is an optional feature that is not always built as
2109 part of Open vSwitch.</p>
2111 <dt><code>ptcp:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
2113 Listens for connections on the specified TCP <var>port</var>
2114 (default: 6633). If <var>ip</var>, which must be expressed as an
2115 IP address (not a DNS name), is specified, then connections are
2116 restricted to the specified local IP address.
2119 <p>When multiple controllers are configured for a single bridge, the
2120 <ref column="target"/> values must be unique. Duplicate
2121 <ref column="target"/> values yield unspecified results.</p>
2124 <column name="connection_mode">
2125 <p>If it is specified, this setting must be one of the following
2126 strings that describes how Open vSwitch contacts this OpenFlow
2127 controller over the network:</p>
2130 <dt><code>in-band</code></dt>
2131 <dd>In this mode, this controller's OpenFlow traffic travels over the
2132 bridge associated with the controller. With this setting, Open
2133 vSwitch allows traffic to and from the controller regardless of the
2134 contents of the OpenFlow flow table. (Otherwise, Open vSwitch
2135 would never be able to connect to the controller, because it did
2136 not have a flow to enable it.) This is the most common connection
2137 mode because it is not necessary to maintain two independent
2139 <dt><code>out-of-band</code></dt>
2140 <dd>In this mode, OpenFlow traffic uses a control network separate
2141 from the bridge associated with this controller, that is, the
2142 bridge does not use any of its own network devices to communicate
2143 with the controller. The control network must be configured
2144 separately, before or after <code>ovs-vswitchd</code> is started.
2148 <p>If not specified, the default is implementation-specific.</p>
2152 <group title="Controller Failure Detection and Handling">
2153 <column name="max_backoff">
2154 Maximum number of milliseconds to wait between connection attempts.
2155 Default is implementation-specific.
2158 <column name="inactivity_probe">
2159 Maximum number of milliseconds of idle time on connection to
2160 controller before sending an inactivity probe message. If Open
2161 vSwitch does not communicate with the controller for the specified
2162 number of seconds, it will send a probe. If a response is not
2163 received for the same additional amount of time, Open vSwitch
2164 assumes the connection has been broken and attempts to reconnect.
2165 Default is implementation-specific. A value of 0 disables
2170 <group title="OpenFlow Rate Limiting">
2171 <column name="controller_rate_limit">
2172 <p>The maximum rate at which packets in unknown flows will be
2173 forwarded to the OpenFlow controller, in packets per second. This
2174 feature prevents a single bridge from overwhelming the controller.
2175 If not specified, the default is implementation-specific.</p>
2176 <p>In addition, when a high rate triggers rate-limiting, Open
2177 vSwitch queues controller packets for each port and transmits
2178 them to the controller at the configured rate. The number of
2179 queued packets is limited by
2180 the <ref column="controller_burst_limit"/> value. The packet
2181 queue is shared fairly among the ports on a bridge.</p><p>Open
2182 vSwitch maintains two such packet rate-limiters per bridge.
2183 One of these applies to packets sent up to the controller
2184 because they do not correspond to any flow. The other applies
2185 to packets sent up to the controller by request through flow
2186 actions. When both rate-limiters are filled with packets, the
2187 actual rate that packets are sent to the controller is up to
2188 twice the specified rate.</p>
2191 <column name="controller_burst_limit">
2192 In conjunction with <ref column="controller_rate_limit"/>,
2193 the maximum number of unused packet credits that the bridge will
2194 allow to accumulate, in packets. If not specified, the default
2195 is implementation-specific.
2199 <group title="Additional In-Band Configuration">
2200 <p>These values are considered only in in-band control mode (see
2201 <ref column="connection_mode"/>).</p>
2203 <p>When multiple controllers are configured on a single bridge, there
2204 should be only one set of unique values in these columns. If different
2205 values are set for these columns in different controllers, the effect
2208 <column name="local_ip">
2209 The IP address to configure on the local port,
2210 e.g. <code>192.168.0.123</code>. If this value is unset, then
2211 <ref column="local_netmask"/> and <ref column="local_gateway"/> are
2215 <column name="local_netmask">
2216 The IP netmask to configure on the local port,
2217 e.g. <code>255.255.255.0</code>. If <ref column="local_ip"/> is set
2218 but this value is unset, then the default is chosen based on whether
2219 the IP address is class A, B, or C.
2222 <column name="local_gateway">
2223 The IP address of the gateway to configure on the local port, as a
2224 string, e.g. <code>192.168.0.1</code>. Leave this column unset if
2225 this network has no gateway.
2229 <group title="Controller Status">
2230 <column name="is_connected">
2231 <code>true</code> if currently connected to this controller,
2232 <code>false</code> otherwise.
2236 type='{"type": "string", "enum": ["set", ["other", "master", "slave"]]}'>
2237 <p>The level of authority this controller has on the associated
2238 bridge. Possible values are:</p>
2240 <dt><code>other</code></dt>
2241 <dd>Allows the controller access to all OpenFlow features.</dd>
2242 <dt><code>master</code></dt>
2243 <dd>Equivalent to <code>other</code>, except that there may be at
2244 most one master controller at a time. When a controller configures
2245 itself as <code>master</code>, any existing master is demoted to
2246 the <code>slave</code>role.</dd>
2247 <dt><code>slave</code></dt>
2248 <dd>Allows the controller read-only access to OpenFlow features.
2249 Attempts to modify the flow table will be rejected with an
2250 error. Slave controllers do not receive OFPT_PACKET_IN or
2251 OFPT_FLOW_REMOVED messages, but they do receive OFPT_PORT_STATUS
2256 <column name="status" key="last_error">
2257 A human-readable description of the last error on the connection
2258 to the controller; i.e. <code>strerror(errno)</code>. This key
2259 will exist only if an error has occurred.
2262 <column name="status" key="state"
2263 type='{"type": "string", "enum": ["set", ["VOID", "BACKOFF", "CONNECTING", "ACTIVE", "IDLE"]]}'>
2265 The state of the connection to the controller:
2268 <dt><code>VOID</code></dt>
2269 <dd>Connection is disabled.</dd>
2271 <dt><code>BACKOFF</code></dt>
2272 <dd>Attempting to reconnect at an increasing period.</dd>
2274 <dt><code>CONNECTING</code></dt>
2275 <dd>Attempting to connect.</dd>
2277 <dt><code>ACTIVE</code></dt>
2278 <dd>Connected, remote host responsive.</dd>
2280 <dt><code>IDLE</code></dt>
2281 <dd>Connection is idle. Waiting for response to keep-alive.</dd>
2284 These values may change in the future. They are provided only for
2289 <column name="status" key="sec_since_connect"
2290 type='{"type": "integer", "minInteger": 0}'>
2291 The amount of time since this controller last successfully connected to
2292 the switch (in seconds). Value is empty if controller has never
2293 successfully connected.
2296 <column name="status" key="sec_since_disconnect"
2297 type='{"type": "integer", "minInteger": 1}'>
2298 The amount of time since this controller last disconnected from
2299 the switch (in seconds). Value is empty if controller has never
2304 <group title="Common Columns">
2305 The overall purpose of these columns is described under <code>Common
2306 Columns</code> at the beginning of this document.
2308 <column name="external_ids"/>
2312 <table name="Manager" title="OVSDB management connection.">
2314 Configuration for a database connection to an Open vSwitch database
2319 This table primarily configures the Open vSwitch database
2320 (<code>ovsdb-server</code>), not the Open vSwitch switch
2321 (<code>ovs-vswitchd</code>). The switch does read the table to determine
2322 what connections should be treated as in-band.
2326 The Open vSwitch database server can initiate and maintain active
2327 connections to remote clients. It can also listen for database
2331 <group title="Core Features">
2332 <column name="target">
2333 <p>Connection method for managers.</p>
2335 The following connection methods are currently supported:
2338 <dt><code>ssl:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
2341 The specified SSL <var>port</var> (default: 6632) on the host at
2342 the given <var>ip</var>, which must be expressed as an IP address
2343 (not a DNS name). The <ref table="Open_vSwitch" column="ssl"/>
2344 column in the <ref table="Open_vSwitch"/> table must point to a
2345 valid SSL configuration when this form is used.
2348 SSL support is an optional feature that is not always built as
2349 part of Open vSwitch.
2353 <dt><code>tcp:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
2355 The specified TCP <var>port</var> (default: 6632) on the host at
2356 the given <var>ip</var>, which must be expressed as an IP address
2359 <dt><code>pssl:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
2362 Listens for SSL connections on the specified TCP <var>port</var>
2363 (default: 6632). If <var>ip</var>, which must be expressed as an
2364 IP address (not a DNS name), is specified, then connections are
2365 restricted to the specified local IP address.
2368 The <ref table="Open_vSwitch" column="ssl"/> column in the <ref
2369 table="Open_vSwitch"/> table must point to a valid SSL
2370 configuration when this form is used.
2373 SSL support is an optional feature that is not always built as
2374 part of Open vSwitch.
2377 <dt><code>ptcp:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
2379 Listens for connections on the specified TCP <var>port</var>
2380 (default: 6632). If <var>ip</var>, which must be expressed as an
2381 IP address (not a DNS name), is specified, then connections are
2382 restricted to the specified local IP address.
2385 <p>When multiple managers are configured, the <ref column="target"/>
2386 values must be unique. Duplicate <ref column="target"/> values yield
2387 unspecified results.</p>
2390 <column name="connection_mode">
2392 If it is specified, this setting must be one of the following strings
2393 that describes how Open vSwitch contacts this OVSDB client over the
2398 <dt><code>in-band</code></dt>
2400 In this mode, this connection's traffic travels over a bridge
2401 managed by Open vSwitch. With this setting, Open vSwitch allows
2402 traffic to and from the client regardless of the contents of the
2403 OpenFlow flow table. (Otherwise, Open vSwitch would never be able
2404 to connect to the client, because it did not have a flow to enable
2405 it.) This is the most common connection mode because it is not
2406 necessary to maintain two independent networks.
2408 <dt><code>out-of-band</code></dt>
2410 In this mode, the client's traffic uses a control network separate
2411 from that managed by Open vSwitch, that is, Open vSwitch does not
2412 use any of its own network devices to communicate with the client.
2413 The control network must be configured separately, before or after
2414 <code>ovs-vswitchd</code> is started.
2419 If not specified, the default is implementation-specific.
2424 <group title="Client Failure Detection and Handling">
2425 <column name="max_backoff">
2426 Maximum number of milliseconds to wait between connection attempts.
2427 Default is implementation-specific.
2430 <column name="inactivity_probe">
2431 Maximum number of milliseconds of idle time on connection to the client
2432 before sending an inactivity probe message. If Open vSwitch does not
2433 communicate with the client for the specified number of seconds, it
2434 will send a probe. If a response is not received for the same
2435 additional amount of time, Open vSwitch assumes the connection has been
2436 broken and attempts to reconnect. Default is implementation-specific.
2437 A value of 0 disables inactivity probes.
2441 <group title="Status">
2442 <column name="is_connected">
2443 <code>true</code> if currently connected to this manager,
2444 <code>false</code> otherwise.
2447 <column name="status" key="last_error">
2448 A human-readable description of the last error on the connection
2449 to the manager; i.e. <code>strerror(errno)</code>. This key
2450 will exist only if an error has occurred.
2453 <column name="status" key="state"
2454 type='{"type": "string", "enum": ["set", ["VOID", "BACKOFF", "CONNECTING", "ACTIVE", "IDLE"]]}'>
2456 The state of the connection to the manager:
2459 <dt><code>VOID</code></dt>
2460 <dd>Connection is disabled.</dd>
2462 <dt><code>BACKOFF</code></dt>
2463 <dd>Attempting to reconnect at an increasing period.</dd>
2465 <dt><code>CONNECTING</code></dt>
2466 <dd>Attempting to connect.</dd>
2468 <dt><code>ACTIVE</code></dt>
2469 <dd>Connected, remote host responsive.</dd>
2471 <dt><code>IDLE</code></dt>
2472 <dd>Connection is idle. Waiting for response to keep-alive.</dd>
2475 These values may change in the future. They are provided only for
2480 <column name="status" key="sec_since_connect"
2481 type='{"type": "integer", "minInteger": 0}'>
2482 The amount of time since this manager last successfully connected
2483 to the database (in seconds). Value is empty if manager has never
2484 successfully connected.
2487 <column name="status" key="sec_since_disconnect"
2488 type='{"type": "integer", "minInteger": 0}'>
2489 The amount of time since this manager last disconnected from the
2490 database (in seconds). Value is empty if manager has never
2494 <column name="status" key="locks_held">
2495 Space-separated list of the names of OVSDB locks that the connection
2496 holds. Omitted if the connection does not hold any locks.
2499 <column name="status" key="locks_waiting">
2500 Space-separated list of the names of OVSDB locks that the connection is
2501 currently waiting to acquire. Omitted if the connection is not waiting
2505 <column name="status" key="locks_lost">
2506 Space-separated list of the names of OVSDB locks that the connection
2507 has had stolen by another OVSDB client. Omitted if no locks have been
2508 stolen from this connection.
2511 <column name="status" key="n_connections"
2512 type='{"type": "integer", "minInteger": 2}'>
2514 When <ref column="target"/> specifies a connection method that
2515 listens for inbound connections (e.g. <code>ptcp:</code> or
2516 <code>pssl:</code>) and more than one connection is actually active,
2517 the value is the number of active connections. Otherwise, this
2518 key-value pair is omitted.
2521 When multiple connections are active, status columns and key-value
2522 pairs (other than this one) report the status of one arbitrarily
2528 <group title="Common Columns">
2529 The overall purpose of these columns is described under <code>Common
2530 Columns</code> at the beginning of this document.
2532 <column name="external_ids"/>
2536 <table name="NetFlow">
2537 A NetFlow target. NetFlow is a protocol that exports a number of
2538 details about terminating IP flows, such as the principals involved
2541 <column name="targets">
2542 NetFlow targets in the form
2543 <code><var>ip</var>:<var>port</var></code>. The <var>ip</var>
2544 must be specified numerically, not as a DNS name.
2547 <column name="engine_id">
2548 Engine ID to use in NetFlow messages. Defaults to datapath index
2552 <column name="engine_type">
2553 Engine type to use in NetFlow messages. Defaults to datapath
2554 index if not specified.
2557 <column name="active_timeout">
2558 The interval at which NetFlow records are sent for flows that are
2559 still active, in seconds. A value of <code>0</code> requests the
2560 default timeout (currently 600 seconds); a value of <code>-1</code>
2561 disables active timeouts.
2564 <column name="add_id_to_interface">
2565 <p>If this column's value is <code>false</code>, the ingress and egress
2566 interface fields of NetFlow flow records are derived from OpenFlow port
2567 numbers. When it is <code>true</code>, the 7 most significant bits of
2568 these fields will be replaced by the least significant 7 bits of the
2569 engine id. This is useful because many NetFlow collectors do not
2570 expect multiple switches to be sending messages from the same host, so
2571 they do not store the engine information which could be used to
2572 disambiguate the traffic.</p>
2573 <p>When this option is enabled, a maximum of 508 ports are supported.</p>
2576 <group title="Common Columns">
2577 The overall purpose of these columns is described under <code>Common
2578 Columns</code> at the beginning of this document.
2580 <column name="external_ids"/>
2585 SSL configuration for an Open_vSwitch.
2587 <column name="private_key">
2588 Name of a PEM file containing the private key used as the switch's
2589 identity for SSL connections to the controller.
2592 <column name="certificate">
2593 Name of a PEM file containing a certificate, signed by the
2594 certificate authority (CA) used by the controller and manager,
2595 that certifies the switch's private key, identifying a trustworthy
2599 <column name="ca_cert">
2600 Name of a PEM file containing the CA certificate used to verify
2601 that the switch is connected to a trustworthy controller.
2604 <column name="bootstrap_ca_cert">
2605 If set to <code>true</code>, then Open vSwitch will attempt to
2606 obtain the CA certificate from the controller on its first SSL
2607 connection and save it to the named PEM file. If it is successful,
2608 it will immediately drop the connection and reconnect, and from then
2609 on all SSL connections must be authenticated by a certificate signed
2610 by the CA certificate thus obtained. <em>This option exposes the
2611 SSL connection to a man-in-the-middle attack obtaining the initial
2612 CA certificate.</em> It may still be useful for bootstrapping.
2615 <group title="Common Columns">
2616 The overall purpose of these columns is described under <code>Common
2617 Columns</code> at the beginning of this document.
2619 <column name="external_ids"/>
2623 <table name="sFlow">
2624 <p>An sFlow(R) target. sFlow is a protocol for remote monitoring
2627 <column name="agent">
2628 Name of the network device whose IP address should be reported as the
2629 ``agent address'' to collectors. If not specified, the IP address
2630 defaults to the <ref table="Controller" column="local_ip"/> in the
2631 collector's <ref table="Controller"/>. If an agent IP address cannot be
2632 determined either way, sFlow is disabled.
2635 <column name="header">
2636 Number of bytes of a sampled packet to send to the collector.
2637 If not specified, the default is 128 bytes.
2640 <column name="polling">
2641 Polling rate in seconds to send port statistics to the collector.
2642 If not specified, defaults to 30 seconds.
2645 <column name="sampling">
2646 Rate at which packets should be sampled and sent to the collector.
2647 If not specified, defaults to 400, which means one out of 400
2648 packets, on average, will be sent to the collector.
2651 <column name="targets">
2652 sFlow targets in the form
2653 <code><var>ip</var>:<var>port</var></code>.
2656 <group title="Common Columns">
2657 The overall purpose of these columns is described under <code>Common
2658 Columns</code> at the beginning of this document.
2660 <column name="external_ids"/>
2664 <table name="Capability">
2665 <p>Records in this table describe functionality supported by the hardware
2666 and software platform on which this Open vSwitch is based. Clients
2667 should not modify this table.</p>
2669 <p>A record in this table is meaningful only if it is referenced by the
2670 <ref table="Open_vSwitch" column="capabilities"/> column in the
2671 <ref table="Open_vSwitch"/> table. The key used to reference it, called
2672 the record's ``category,'' determines the meanings of the
2673 <ref column="details"/> column. The following general forms of
2674 categories are currently defined:</p>
2677 <dt><code>qos-<var>type</var></code></dt>
2678 <dd><var>type</var> is supported as the value for
2679 <ref column="type" table="QoS"/> in the <ref table="QoS"/> table.
2683 <column name="details">
2684 <p>Key-value pairs that describe capabilities. The meaning of the pairs
2685 depends on the category key that the <ref table="Open_vSwitch"
2686 column="capabilities"/> column in the <ref table="Open_vSwitch"/> table
2687 uses to reference this record, as described above.</p>
2689 <p>The presence of a record for category <code>qos-<var>type</var></code>
2690 indicates that the switch supports <var>type</var> as the value of
2691 the <ref table="QoS" column="type"/> column in the <ref table="QoS"/>
2692 table. The following key-value pairs are defined to further describe
2693 QoS capabilities:</p>
2696 <dt><code>n-queues</code></dt>
2697 <dd>Number of supported queues, as a positive integer. Keys in the
2698 <ref table="QoS" column="queues"/> column for <ref table="QoS"/>
2699 records whose <ref table="QoS" column="type"/> value
2700 equals <var>type</var> must range between 0 and this value minus one,