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
12 ``root set'' tables noted below.
15 <table name="Open_vSwitch" title="Open vSwitch configuration.">
16 Configuration for an Open vSwitch daemon. There must be exactly
17 one record in the <ref table="Open_vSwitch"/> table.
19 <group title="Configuration">
20 <column name="bridges">
21 Set of bridges managed by the daemon.
25 SSL used globally by the daemon.
28 <column name="external_ids">
29 Key-value pairs for use by external frameworks that integrate
30 with Open vSwitch, rather than by Open vSwitch itself. System
31 integrators should either use the Open vSwitch development
32 mailing list to coordinate on common key-value definitions, or
33 choose key names that are likely to be unique. The currently
34 defined common key-value pairs are:
36 <dt><code>system-id</code></dt>
37 <dd>A unique identifier for the Open vSwitch's physical host.
38 The form of the identifier depends on the type of the host.
39 On a Citrix XenServer, this will likely be the same as
40 <code>xs-system-uuid</code>.</dd>
41 <dt><code>xs-system-uuid</code></dt>
42 <dd>The Citrix XenServer universally unique identifier for the
43 physical host as displayed by <code>xe host-list</code>.</dd>
48 <group title="Status">
49 <column name="next_cfg">
50 Sequence number for client to increment. When a client modifies
51 any part of the database configuration and wishes to wait for
52 Open vSwitch to finish applying the changes, it may increment
56 <column name="cur_cfg">
57 Sequence number that Open vSwitch sets to the current value of
58 <ref column="next_cfg"/> after it finishes applying a set of
59 configuration changes.
62 <column name="capabilities">
63 Describes functionality supported by the hardware and software platform
64 on which this Open vSwitch is based. Clients should not modify this
65 column. See the <ref table="Capability"/> description for defined
66 capability categories and the meaning of associated
67 <ref table="Capability"/> records.
70 <column name="statistics">
72 Key-value pairs that report statistics about a system running an Open
73 vSwitch. These are updated periodically (currently, every 5
74 seconds). Key-value pairs that cannot be determined or that do not
75 apply to a platform are omitted.
79 <dt><code>cpu</code></dt>
82 Number of CPU processors, threads, or cores currently online and
83 available to the operating system on which Open vSwitch is
84 running, as an integer. This may be less than the number
85 installed, if some are not online or if they are not available to
89 Open vSwitch userspace processes are not multithreaded, but the
90 Linux kernel-based datapath is.
94 <dt><code>load_average</code></dt>
97 A comma-separated list of three floating-point numbers,
98 representing the system load average over the last 1, 5, and 15
99 minutes, respectively.
103 <dt><code>memory</code></dt>
106 A comma-separated list of integers, each of which represents a
107 quantity of memory in kilobytes that describes the operating
108 system on which Open vSwitch is running. In respective order,
113 <li>Total amount of RAM allocated to the OS.</li>
114 <li>RAM allocated to the OS that is in use.</li>
115 <li>RAM that can be flushed out to disk or otherwise discarded
116 if that space is needed for another purpose. This number is
117 necessarily less than or equal to the previous value.</li>
118 <li>Total disk space allocated for swap.</li>
119 <li>Swap space currently in use.</li>
123 On Linux, all five values can be determined and are included. On
124 other operating systems, only the first two values can be
125 determined, so the list will only have two values.
129 <dt><code>process_</code><var>name</var></dt>
132 One such key-value pair will exist for each running Open vSwitch
133 daemon process, with <var>name</var> replaced by the daemon's
134 name (e.g. <code>process_ovs-vswitchd</code>). The value is a
135 comma-separated list of integers. The integers represent the
136 following, with memory measured in kilobytes and durations in
141 <li>The process's virtual memory size.</li>
142 <li>The process's resident set size.</li>
143 <li>The amount of user and system CPU time consumed by the
145 <li>The number of times that the process has crashed and been
146 automatically restarted by the monitor.</li>
147 <li>The duration since the process was started.</li>
148 <li>The duration for which the process has been running.</li>
152 The interpretation of some of these values depends on whether the
153 process was started with the <option>--monitor</option>. If it
154 was not, then the crash count will always be 0 and the two
155 durations will always be the same. If <option>--monitor</option>
156 was given, then the crash count may be positive; if it is, the
157 latter duration is the amount of time since the most recent crash
162 There will be one key-value pair for each file in Open vSwitch's
163 ``run directory'' (usually <code>/var/run/openvswitch</code>)
164 whose name ends in <code>.pid</code>, whose contents are a
165 process ID, and which is locked by a running process. The
166 <var>name</var> is taken from the pidfile's name.
170 Currently Open vSwitch is only able to obtain all of the above
171 detail on Linux systems. On other systems, the same key-value
172 pairs will be present but the values will always be the empty
177 <dt><code>file_systems</code></dt>
180 A space-separated list of information on local, writable file
181 systems. Each item in the list describes one file system and
182 consists in turn of a comma-separated list of the following:
186 <li>Mount point, e.g. <code>/</code> or <code>/var/log</code>.
187 Any spaces or commas in the mount point are replaced by
189 <li>Total size, in kilobytes, as an integer.</li>
190 <li>Amount of storage in use, in kilobytes, as an integer.</li>
194 This key-value pair is omitted if there are no local, writable
195 file systems or if Open vSwitch cannot obtain the needed
203 <group title="Version Reporting">
205 These columns report the types and versions of the hardware and
206 software running Open vSwitch. We recommend in general that software
207 should test whether specific features are supported instead of relying
208 on version number checks. These values are primarily intended for
209 reporting to human administrators.
212 <column name="ovs_version">
213 The Open vSwitch version number, e.g. <code>1.1.0</code>.
214 If Open vSwitch was configured with a build number, then it is
215 also included, e.g. <code>1.1.0+build6579</code>.
218 <column name="db_version">
220 The database schema version number in the form
221 <code><var>major</var>.<var>minor</var>.<var>tweak</var></code>,
222 e.g. <code>1.2.3</code>. Whenever the database schema is changed in
223 a non-backward compatible way (e.g. deleting a column or a table),
224 <var>major</var> is incremented. When the database schema is changed
225 in a backward compatible way (e.g. adding a new column),
226 <var>minor</var> is incremented. When the database schema is changed
227 cosmetically (e.g. reindenting its syntax), <var>tweak</var> is
232 The schema version is part of the database schema, so it can also be
233 retrieved by fetching the schema using the Open vSwitch database
238 <column name="system_type">
240 An identifier for the type of system on top of which Open vSwitch
241 runs, e.g. <code>XenServer</code> or <code>KVM</code>.
244 System integrators are responsible for choosing and setting an
245 appropriate value for this column.
249 <column name="system_version">
251 The version of the system identified by <ref column="system_type"/>,
252 e.g. <code>5.6.100-39265p</code> on XenServer 5.6.100 build 39265.
255 System integrators are responsible for choosing and setting an
256 appropriate value for this column.
262 <group title="Database Configuration">
264 These columns primarily configure the Open vSwitch database
265 (<code>ovsdb-server</code>), not the Open vSwitch switch
266 (<code>ovs-vswitchd</code>). The OVSDB database also uses the <ref
267 column="ssl"/> settings.
271 The Open vSwitch switch does read the database configuration to
272 determine remote IP addresses to which in-band control should apply.
275 <column name="manager_options">
276 Database clients to which the Open vSwitch database server should
277 connect or to which it should listen, along with options for how these
278 connection should be configured. See the <ref table="Manager"/> table
279 for more information.
284 <table name="Bridge">
286 Configuration for a bridge within an
287 <ref table="Open_vSwitch"/>.
290 A <ref table="Bridge"/> record represents an Ethernet switch with one or
291 more ``ports,'' which are the <ref table="Port"/> records pointed to by
292 the <ref table="Bridge"/>'s <ref column="ports"/> column.
295 <group title="Core Features">
297 Bridge identifier. Should be alphanumeric and no more than about 8
298 bytes long. Must be unique among the names of ports, interfaces, and
302 <column name="ports">
303 Ports included in the bridge.
306 <column name="mirrors">
307 Port mirroring configuration.
310 <column name="netflow">
311 NetFlow configuration.
314 <column name="sflow">
318 <column name="flood_vlans">
319 VLAN IDs of VLANs on which MAC address learning should be disabled, so
320 that packets are flooded instead of being sent to specific ports that
321 are believed to contain packets' destination MACs. This should
322 ordinarily be used to disable MAC learning on VLANs used for mirroring
323 (RSPAN VLANs). It may also be useful for debugging.
327 <group title="OpenFlow Configuration">
328 <column name="controller">
329 OpenFlow controller set. If unset, then no OpenFlow controllers
333 <column name="fail_mode">
334 <p>When a controller is configured, it is, ordinarily, responsible
335 for setting up all flows on the switch. Thus, if the connection to
336 the controller fails, no new network connections can be set up.
337 If the connection to the controller stays down long enough,
338 no packets can pass through the switch at all. This setting
339 determines the switch's response to such a situation. It may be set
340 to one of the following:
342 <dt><code>standalone</code></dt>
343 <dd>If no message is received from the controller for three
344 times the inactivity probe interval
345 (see <ref column="inactivity_probe"/>), then Open vSwitch
346 will take over responsibility for setting up flows. In
347 this mode, Open vSwitch causes the bridge to act like an
348 ordinary MAC-learning switch. Open vSwitch will continue
349 to retry connecting to the controller in the background
350 and, when the connection succeeds, it will discontinue its
351 standalone behavior.</dd>
352 <dt><code>secure</code></dt>
353 <dd>Open vSwitch will not set up flows on its own when the
354 controller connection fails or when no controllers are
355 defined. The bridge will continue to retry connecting to
356 any defined controllers forever.</dd>
359 <p>If this value is unset, the default is implementation-specific.</p>
360 <p>When more than one controller is configured,
361 <ref column="fail_mode"/> is considered only when none of the
362 configured controllers can be contacted.</p>
365 <column name="datapath_id">
366 Reports the OpenFlow datapath ID in use. Exactly 16 hex
367 digits. (Setting this column will have no useful effect. Set
368 <ref column="other_config"/>:<code>other-config</code>
373 <group title="Other Features">
374 <column name="datapath_type">
375 Name of datapath provider. The kernel datapath has
376 type <code>system</code>. The userspace datapath has
377 type <code>netdev</code>.
380 <column name="external_ids">
381 Key-value pairs for use by external frameworks that integrate
382 with Open vSwitch, rather than by Open vSwitch itself. System
383 integrators should either use the Open vSwitch development
384 mailing list to coordinate on common key-value definitions, or
385 choose key names that are likely to be unique. The currently
386 defined key-value pairs are:
388 <dt><code>bridge-id</code></dt>
389 <dd>A unique identifier of the bridge. On Citrix XenServer this
390 will commonly be the same as <code>xs-network-uuids</code>.</dd>
391 <dt><code>xs-network-uuids</code></dt>
392 <dd>Semicolon-delimited set of universally unique identifier(s) for
393 the network with which this bridge is associated on a Citrix
394 XenServer host. The network identifiers are RFC 4122 UUIDs as
395 displayed by, e.g., <code>xe network-list</code>.</dd>
399 <column name="other_config">
400 Key-value pairs for configuring rarely used bridge
401 features. The currently defined key-value pairs are:
403 <dt><code>datapath-id</code></dt>
405 digits to set the OpenFlow datapath ID to a specific
406 value. May not be all-zero.</dd>
407 <dt><code>disable-in-band</code></dt>
408 <dd>If set to <code>true</code>, disable in-band control on
409 the bridge regardless of controller and manager settings.</dd>
410 <dt><code>hwaddr</code></dt>
411 <dd>An Ethernet address in the form
412 <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>
413 to set the hardware address of the local port and influence the
415 <dt><code>in-band-queue</code></dt>
417 A queue ID as a nonnegative integer. This sets the OpenFlow queue
418 ID that will be used by flows set up by in-band control on this
419 bridge. If unset, or if the port used by an in-band control flow
420 does not have QoS configured, or if the port does not have a queue
421 with the specified ID, the default queue is used instead.
428 <table name="Port" table="Port or bond configuration.">
429 <p>A port within a <ref table="Bridge"/>.</p>
430 <p>Most commonly, a port has exactly one ``interface,'' pointed to by its
431 <ref column="interfaces"/> column. Such a port logically
432 corresponds to a port on a physical Ethernet switch. A port
433 with more than one interface is a ``bonded port'' (see
434 <ref group="Bonding Configuration"/>).</p>
435 <p>Some properties that one might think as belonging to a port are actually
436 part of the port's <ref table="Interface"/> members.</p>
439 Port name. Should be alphanumeric and no more than about 8
440 bytes long. May be the same as the interface name, for
441 non-bonded ports. Must otherwise be unique among the names of
442 ports, interfaces, and bridges on a host.
445 <column name="interfaces">
446 The port's interfaces. If there is more than one, this is a
450 <group title="VLAN Configuration">
451 <p>A bridge port must be configured for VLANs in one of two
452 mutually exclusive ways:
454 <li>A ``trunk port'' has an empty value for <ref
455 column="tag"/>. Its <ref column="trunks"/> value may be
456 empty or non-empty.</li>
457 <li>An ``implicitly tagged VLAN port'' or ``access port''
458 has an nonempty value for <ref column="tag"/>. Its
459 <ref column="trunks"/> value must be empty.</li>
461 If <ref column="trunks"/> and <ref column="tag"/> are both
462 nonempty, the configuration is ill-formed.
467 If this is an access port (see above), the port's implicitly
468 tagged VLAN. Must be empty if this is a trunk port.
471 Frames arriving on trunk ports will be forwarded to this
472 port only if they are tagged with the given VLAN (or, if
473 <ref column="tag"/> is 0, then if they lack a VLAN header).
474 Frames arriving on other access ports will be forwarded to
475 this port only if they have the same <ref column="tag"/>
476 value. Frames forwarded to this port will not have an
480 When a frame with a 802.1Q header that indicates a nonzero
481 VLAN is received on an access port, it is discarded.
485 <column name="trunks">
487 If this is a trunk port (see above), the 802.1Q VLAN(s) that
488 this port trunks; if it is empty, then the port trunks all
489 VLANs. Must be empty if this is an access port.
492 Frames arriving on trunk ports are dropped if they are not
493 in one of the specified VLANs. For this purpose, packets
494 that have no VLAN header are treated as part of VLAN 0.
499 <group title="Bonding Configuration">
500 <p>A port that has more than one interface is a ``bonded port.'' Bonding
501 allows for load balancing and fail-over. Some kinds of bonding will
502 work with any kind of upstream switch:</p>
505 <dt><code>balance-slb</code></dt>
507 Balances flows among slaves based on source MAC address and output
508 VLAN, with periodic rebalancing as traffic patterns change.
511 <dt><code>active-backup</code></dt>
513 Assigns all flows to one slave, failing over to a backup slave when
514 the active slave is disabled.
519 The following mode requires the upstream switch to support 802.3ad with
520 successful LACP negotiation. If LACP negotiation fails then
521 <code>balance-slb</code> mode is used as a fallback:
525 <dt><code>balance-tcp</code></dt>
527 Balances flows among slaves based on L2, L3, and L4 protocol
528 information such as destination MAC address, IP address, and TCP
533 <p>These columns apply only to bonded ports. Their values are
534 otherwise ignored.</p>
536 <column name="bond_mode">
537 <p>The type of bonding used for a bonded port. Defaults to
538 <code>balance-slb</code> if unset.
542 <column name="bond_updelay">
543 <p>For a bonded port, the number of milliseconds for which carrier must
544 stay up on an interface before the interface is considered to be up.
545 Specify <code>0</code> to enable the interface immediately.</p>
546 <p>This setting is honored only when at least one bonded interface is
547 already enabled. When no interfaces are enabled, then the first bond
548 interface to come up is enabled immediately.</p>
551 <column name="bond_downdelay">
552 For a bonded port, the number of milliseconds for which carrier must
553 stay down on an interface before the interface is considered to be
554 down. Specify <code>0</code> to disable the interface immediately.
557 <column name="bond_fake_iface">
558 For a bonded port, whether to create a fake internal interface with the
559 name of the port. Use only for compatibility with legacy software that
564 <p>Configures LACP on this port. LACP allows directly connected
565 switches to negotiate which links may be bonded. LACP may be enabled
566 on non-bonded ports for the benefit of any switches they may be
567 connected to. <code>active</code> ports are allowed to initiate LACP
568 negotiations. <code>passive</code> ports are allowed to participate
569 in LACP negotiations initiated by a remote switch, but not allowed to
570 initiate such negotiations themselves. If unset Open vSwitch will
571 choose a reasonable default. </p>
576 <group title="Other Features">
578 Quality of Service configuration for this port.
582 The MAC address to use for this port for the purpose of choosing the
583 bridge's MAC address. This column does not necessarily reflect the
584 port's actual MAC address, nor will setting it change the port's actual
588 <column name="fake_bridge">
589 Does this port represent a sub-bridge for its tagged VLAN within the
590 Bridge? See ovs-vsctl(8) for more information.
593 <column name="external_ids">
595 Key-value pairs for use by external frameworks that integrate with
596 Open vSwitch, rather than by Open vSwitch itself. System integrators
597 should either use the Open vSwitch development mailing list to
598 coordinate on common key-value definitions, or choose key names that
599 are likely to be unique.
602 No key-value pairs native to <ref table="Port"/> are currently
603 defined. For fake bridges (see the <ref column="fake_bridge"/>
604 column), external IDs for the fake bridge are defined here by
605 prefixing a <ref table="Bridge"/> <ref table="Bridge"
606 column="external_ids"/> key with <code>fake-bridge-</code>,
607 e.g. <code>fake-bridge-xs-network-uuids</code>.
611 <column name="other_config">
612 Key-value pairs for configuring rarely used port features. The
613 currently defined key-value pairs are:
615 <dt><code>hwaddr</code></dt>
616 <dd>An Ethernet address in the form
617 <code><var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var></code>.</dd>
618 <dt><code>bond-rebalance-interval</code></dt>
619 <dd>For an SLB bonded port, the number of milliseconds between
620 successive attempts to rebalance the bond, that is, to
621 move source MACs and their flows from one interface on
622 the bond to another in an attempt to keep usage of each
623 interface roughly equal. The default is 10000 (10
624 seconds), and the minimum is 1000 (1 second).</dd>
625 <dt><code>bond-detect-mode</code></dt>
626 <dd> Sets the method used to detect link failures in a bonded port.
627 Options are <code>carrier</code> and <code>miimon</code>. Defaults
628 to <code>carrier</code> which uses each interface's carrier to detect
629 failures. When set to <code>miimon</code>, will check for failures
630 by polling each interface's MII. </dd>
631 <dt><code>bond-miimon-interval</code></dt>
632 <dd> The number of milliseconds between successive attempts to
633 poll each interface's MII. Only relevant on ports which use
634 <code>miimon</code> to detect failures. </dd>
635 <dt><code>lacp-system-priority</code></dt>
636 <dd> The LACP system priority of this <ref table="Port"/>. In
637 LACP negotiations, link status decisions are made by the system
638 with the numerically lower priority. Must be a number between 1
640 <dt><code>lacp-time</code></dt>
641 <dd> The LACP timing which should be used on this
642 <ref table="Port"/>. Possible values are <code>fast</code> and
643 <code>slow</code>. By default <code>slow</code> is used. When
644 configured to be <code>fast</code> more frequent LACP heartbeats
645 will be requested causing connectivity problems to be detected more
652 <table name="Interface" title="One physical network device in a Port.">
653 An interface within a <ref table="Port"/>.
655 <group title="Core Features">
657 Interface name. Should be alphanumeric and no more than about 8 bytes
658 long. May be the same as the port name, for non-bonded ports. Must
659 otherwise be unique among the names of ports, interfaces, and bridges
664 <p>Ethernet address to set for this interface. If unset then the
665 default MAC address is used:</p>
667 <li>For the local interface, the default is the lowest-numbered MAC
668 address among the other bridge ports, either the value of the
669 <ref table="Port" column="mac"/> in its <ref table="Port"/> record,
670 if set, or its actual MAC (for bonded ports, the MAC of its slave
671 whose name is first in alphabetical order). Internal ports and
672 bridge ports that are used as port mirroring destinations (see the
673 <ref table="Mirror"/> table) are ignored.</li>
674 <li>For other internal interfaces, the default MAC is randomly
676 <li>External interfaces typically have a MAC address associated with
679 <p>Some interfaces may not have a software-controllable MAC
683 <column name="ofport">
684 <p>OpenFlow port number for this interface. Unlike most columns, this
685 column's value should be set only by Open vSwitch itself. Other
686 clients should set this column to an empty set (the default) when
687 creating an <ref table="Interface"/>.</p>
688 <p>Open vSwitch populates this column when the port number becomes
689 known. If the interface is successfully added,
690 <ref column="ofport"/> will be set to a number between 1 and 65535
691 (generally either in the range 1 to 65279, inclusive, or 65534, the
692 port number for the OpenFlow ``local port''). If the interface
693 cannot be added then Open vSwitch sets this column
698 <group title="System-Specific Details">
700 The interface type, one of:
702 <dt><code>system</code></dt>
703 <dd>An ordinary network device, e.g. <code>eth0</code> on Linux.
704 Sometimes referred to as ``external interfaces'' since they are
705 generally connected to hardware external to that on which the Open
706 vSwitch is running. The empty string is a synonym for
707 <code>system</code>.</dd>
708 <dt><code>internal</code></dt>
709 <dd>A simulated network device that sends and receives traffic. An
710 internal interface whose <ref column="name"/> is the same as its
711 bridge's <ref table="Open_vSwitch" column="name"/> is called the
712 ``local interface.'' It does not make sense to bond an internal
713 interface, so the terms ``port'' and ``interface'' are often used
714 imprecisely for internal interfaces.</dd>
715 <dt><code>tap</code></dt>
716 <dd>A TUN/TAP device managed by Open vSwitch.</dd>
717 <dt><code>gre</code></dt>
718 <dd>An Ethernet over RFC 2890 Generic Routing Encapsulation over IPv4
719 tunnel. Each tunnel must be uniquely identified by the
720 combination of <code>remote_ip</code>, <code>local_ip</code>, and
721 <code>in_key</code>. Note that if two ports are defined that are
722 the same except one has an optional identifier and the other does
723 not, the more specific one is matched first. <code>in_key</code>
724 is considered more specific than <code>local_ip</code> if a port
725 defines one and another port defines the other. The following
726 options may be specified in the <ref column="options"/> column:
728 <dt><code>remote_ip</code></dt>
729 <dd>Required. The tunnel endpoint.</dd>
732 <dt><code>local_ip</code></dt>
733 <dd>Optional. The destination IP that received packets must
734 match. Default is to match all addresses.</dd>
737 <dt><code>in_key</code></dt>
738 <dd>Optional. The GRE key that received packets must contain.
739 It may either be a 32-bit number (no key and a key of 0 are
740 treated as equivalent) or the word <code>flow</code>. If
741 <code>flow</code> is specified then any key will be accepted
742 and the key will be placed in the <code>tun_id</code> field
743 for matching in the flow table. The ovs-ofctl manual page
744 contains additional information about matching fields in
745 OpenFlow flows. Default is no key.</dd>
748 <dt><code>out_key</code></dt>
749 <dd>Optional. The GRE key to be set on outgoing packets. It may
750 either be a 32-bit number or the word <code>flow</code>. If
751 <code>flow</code> is specified then the key may be set using
752 the <code>set_tunnel</code> Nicira OpenFlow vendor extension (0
753 is used in the absence of an action). The ovs-ofctl manual
754 page contains additional information about the Nicira OpenFlow
755 vendor extensions. Default is no key.</dd>
758 <dt><code>key</code></dt>
759 <dd>Optional. Shorthand to set <code>in_key</code> and
760 <code>out_key</code> at the same time.</dd>
763 <dt><code>tos</code></dt>
764 <dd>Optional. The value of the ToS bits to be set on the
765 encapsulating packet. It may also be the word
766 <code>inherit</code>, in which case the ToS will be copied from
767 the inner packet if it is IPv4 or IPv6 (otherwise it will be
768 0). Note that the ECN fields are always inherited. Default is
772 <dt><code>ttl</code></dt>
773 <dd>Optional. The TTL to be set on the encapsulating packet.
774 It may also be the word <code>inherit</code>, in which case the
775 TTL will be copied from the inner packet if it is IPv4 or IPv6
776 (otherwise it will be the system default, typically 64).
777 Default is the system default TTL.</dd>
780 <dt><code>csum</code></dt>
781 <dd>Optional. Compute GRE checksums on outgoing packets.
782 Checksums present on incoming packets will be validated
783 regardless of this setting. Note that GRE checksums
784 impose a significant performance penalty as they cover the
785 entire packet. As the contents of the packet is typically
786 covered by L3 and L4 checksums, this additional checksum only
787 adds value for the GRE and encapsulated Ethernet headers.
788 Default is disabled, set to <code>true</code> to enable.</dd>
791 <dt><code>pmtud</code></dt>
792 <dd>Optional. Enable tunnel path MTU discovery. If enabled
793 ``ICMP destination unreachable - fragmentation'' needed
794 messages will be generated for IPv4 packets with the DF bit set
795 and IPv6 packets above the minimum MTU if the packet size
796 exceeds the path MTU minus the size of the tunnel headers. It
797 also forces the encapsulating packet DF bit to be set (it is
798 always set if the inner packet implies path MTU discovery).
799 Note that this option causes behavior that is typically
800 reserved for routers and therefore is not entirely in
801 compliance with the IEEE 802.1D specification for bridges.
802 Default is enabled, set to <code>false</code> to disable.</dd>
805 <dt><code>header_cache</code></dt>
806 <dd>Optional. Enable caching of tunnel headers and the output
807 path. This can lead to a significant performance increase
808 without changing behavior. In general it should not be
809 necessary to adjust this setting. However, the caching can
810 bypass certain components of the IP stack (such as IP tables)
811 and it may be useful to disable it if these features are
812 required or as a debugging measure. Default is enabled, set to
813 <code>false</code> to disable.</dd>
816 <dt><code>ipsec_gre</code></dt>
817 <dd>An Ethernet over RFC 2890 Generic Routing Encapsulation
818 over IPv4 IPsec tunnel. Each tunnel (including those of type
819 <code>gre</code>) must be uniquely identified by the
820 combination of <code>remote_ip</code> and
821 <code>local_ip</code>. Note that if two ports are defined
822 that are the same except one has an optional identifier and
823 the other does not, the more specific one is matched first.
824 An authentication method of <code>peer_cert</code> or
825 <code>psk</code> must be defined. The following options may
826 be specified in the <ref column="options"/> column:
828 <dt><code>remote_ip</code></dt>
829 <dd>Required. The tunnel endpoint.</dd>
832 <dt><code>local_ip</code></dt>
833 <dd>Optional. The destination IP that received packets must
834 match. Default is to match all addresses.</dd>
837 <dt><code>peer_cert</code></dt>
838 <dd>Required for certificate authentication. A string
839 containing the peer's certificate in PEM format.
840 Additionally the host's certificate must be specified
841 with the <code>certificate</code> option.</dd>
844 <dt><code>certificate</code></dt>
845 <dd>Required for certificate authentication. The name of a
846 PEM file containing a certificate that will be presented
847 to the peer during authentication.</dd>
850 <dt><code>private_key</code></dt>
851 <dd>Optional for certificate authentication. The name of
852 a PEM file containing the private key associated with
853 <code>certificate</code>. If <code>certificate</code>
854 contains the private key, this option may be omitted.</dd>
857 <dt><code>psk</code></dt>
858 <dd>Required for pre-shared key authentication. Specifies a
859 pre-shared key for authentication that must be identical on
860 both sides of the tunnel.</dd>
863 <dt><code>in_key</code></dt>
864 <dd>Optional. The GRE key that received packets must contain.
865 It may either be a 32-bit number (no key and a key of 0 are
866 treated as equivalent) or the word <code>flow</code>. If
867 <code>flow</code> is specified then any key will be accepted
868 and the key will be placed in the <code>tun_id</code> field
869 for matching in the flow table. The ovs-ofctl manual page
870 contains additional information about matching fields in
871 OpenFlow flows. Default is no key.</dd>
874 <dt><code>out_key</code></dt>
875 <dd>Optional. The GRE key to be set on outgoing packets. It may
876 either be a 32-bit number or the word <code>flow</code>. If
877 <code>flow</code> is specified then the key may be set using
878 the <code>set_tunnel</code> Nicira OpenFlow vendor extension (0
879 is used in the absence of an action). The ovs-ofctl manual
880 page contains additional information about the Nicira OpenFlow
881 vendor extensions. Default is no key.</dd>
884 <dt><code>key</code></dt>
885 <dd>Optional. Shorthand to set <code>in_key</code> and
886 <code>out_key</code> at the same time.</dd>
889 <dt><code>tos</code></dt>
890 <dd>Optional. The value of the ToS bits to be set on the
891 encapsulating packet. It may also be the word
892 <code>inherit</code>, in which case the ToS will be copied from
893 the inner packet if it is IPv4 or IPv6 (otherwise it will be
894 0). Note that the ECN fields are always inherited. Default is
898 <dt><code>ttl</code></dt>
899 <dd>Optional. The TTL to be set on the encapsulating packet.
900 It may also be the word <code>inherit</code>, in which case the
901 TTL will be copied from the inner packet if it is IPv4 or IPv6
902 (otherwise it will be the system default, typically 64).
903 Default is the system default TTL.</dd>
906 <dt><code>csum</code></dt>
907 <dd>Optional. Compute GRE checksums on outgoing packets.
908 Checksums present on incoming packets will be validated
909 regardless of this setting. Note that GRE checksums
910 impose a significant performance penalty as they cover the
911 entire packet. As the contents of the packet is typically
912 covered by L3 and L4 checksums, this additional checksum only
913 adds value for the GRE and encapsulated Ethernet headers.
914 Default is disabled, set to <code>true</code> to enable.</dd>
917 <dt><code>pmtud</code></dt>
918 <dd>Optional. Enable tunnel path MTU discovery. If enabled
919 ``ICMP destination unreachable - fragmentation'' needed
920 messages will be generated for IPv4 packets with the DF bit set
921 and IPv6 packets above the minimum MTU if the packet size
922 exceeds the path MTU minus the size of the tunnel headers. It
923 also forces the encapsulating packet DF bit to be set (it is
924 always set if the inner packet implies path MTU discovery).
925 Note that this option causes behavior that is typically
926 reserved for routers and therefore is not entirely in
927 compliance with the IEEE 802.1D specification for bridges.
928 Default is enabled, set to <code>false</code> to disable.</dd>
931 <dt><code>capwap</code></dt>
932 <dd>Ethernet tunneling over the UDP transport portion of CAPWAP
933 (RFC 5415). This allows interoperability with certain switches
934 where GRE is not available. Note that only the tunneling component
935 of the protocol is implemented. Due to the non-standard use of
936 CAPWAP, UDP ports 58881 and 58882 are used as the source and
937 destination ports respectively. Each tunnel must be uniquely
938 identified by the combination of <code>remote_ip</code> and
939 <code>local_ip</code>. If two ports are defined that are the same
940 except one includes <code>local_ip</code> and the other does not,
941 the more specific one is matched first. CAPWAP support is not
942 available on all platforms. Currently it is only supported in the
943 Linux kernel module with kernel versions >= 2.6.25. The following
944 options may be specified in the <ref column="options"/> column:
946 <dt><code>remote_ip</code></dt>
947 <dd>Required. The tunnel endpoint.</dd>
950 <dt><code>local_ip</code></dt>
951 <dd>Optional. The destination IP that received packets must
952 match. Default is to match all addresses.</dd>
955 <dt><code>tos</code></dt>
956 <dd>Optional. The value of the ToS bits to be set on the
957 encapsulating packet. It may also be the word
958 <code>inherit</code>, in which case the ToS will be copied from
959 the inner packet if it is IPv4 or IPv6 (otherwise it will be
960 0). Note that the ECN fields are always inherited. Default is
964 <dt><code>ttl</code></dt>
965 <dd>Optional. The TTL to be set on the encapsulating packet.
966 It may also be the word <code>inherit</code>, in which case the
967 TTL will be copied from the inner packet if it is IPv4 or IPv6
968 (otherwise it will be the system default, typically 64).
969 Default is the system default TTL.</dd>
972 <dt><code>pmtud</code></dt>
973 <dd>Optional. Enable tunnel path MTU discovery. If enabled
974 ``ICMP destination unreachable - fragmentation'' needed
975 messages will be generated for IPv4 packets with the DF bit set
976 and IPv6 packets above the minimum MTU if the packet size
977 exceeds the path MTU minus the size of the tunnel headers. It
978 also forces the encapsulating packet DF bit to be set (it is
979 always set if the inner packet implies path MTU discovery).
980 Note that this option causes behavior that is typically
981 reserved for routers and therefore is not entirely in
982 compliance with the IEEE 802.1D specification for bridges.
983 Default is enabled, set to <code>false</code> to disable.</dd>
986 <dt><code>header_cache</code></dt>
987 <dd>Optional. Enable caching of tunnel headers and the output
988 path. This can lead to a significant performance increase
989 without changing behavior. In general it should not be
990 necessary to adjust this setting. However, the caching can
991 bypass certain components of the IP stack (such as IP tables)
992 and it may be useful to disable it if these features are
993 required or as a debugging measure. Default is enabled, set to
994 <code>false</code> to disable.</dd>
997 <dt><code>patch</code></dt>
1000 A pair of virtual devices that act as a patch cable. The <ref
1001 column="options"/> column must have the following key-value pair:
1004 <dt><code>peer</code></dt>
1006 The <ref column="name"/> of the <ref table="Interface"/> for
1007 the other side of the patch. The named <ref
1008 table="Interface"/>'s own <code>peer</code> option must specify
1009 this <ref table="Interface"/>'s name. That is, the two patch
1010 interfaces must have reversed <ref column="name"/> and
1011 <code>peer</code> values.
1018 <column name="options">
1019 Configuration options whose interpretation varies based on
1020 <ref column="type"/>.
1024 <group title="Interface Status">
1026 Status information about interfaces attached to bridges, updated every
1027 5 seconds. Not all interfaces have all of these properties; virtual
1028 interfaces don't have a link speed, for example. Non-applicable
1029 columns will have empty values.
1031 <column name="admin_state">
1033 The administrative state of the physical network link.
1037 <column name="link_state">
1039 The observed state of the physical network link. This is ordinarily
1040 the link's carrier status. If the interface's <ref table="Port"/> is
1041 a bond configured for miimon monitoring, it is instead the network
1042 link's miimon status.
1046 <column name="link_speed">
1048 The negotiated speed of the physical network link.
1049 Valid values are positive integers greater than 0.
1053 <column name="duplex">
1055 The duplex mode of the physical network link.
1061 The MTU (maximum transmission unit); i.e. the largest
1062 amount of data that can fit into a single Ethernet frame.
1063 The standard Ethernet MTU is 1500 bytes. Some physical media
1064 and many kinds of virtual interfaces can be configured with
1068 This column will be empty for an interface that does not
1069 have an MTU as, for example, some kinds of tunnels do not.
1073 <column name="status">
1075 Key-value pairs that report port status. Supported status
1076 values are <code>type</code>-dependent; some interfaces may not have
1077 a valid <code>driver_name</code>, for example.
1079 <p>The currently defined key-value pairs are:</p>
1081 <dt><code>driver_name</code></dt>
1082 <dd>The name of the device driver controlling the network
1086 <dt><code>driver_version</code></dt>
1087 <dd>The version string of the device driver controlling the
1088 network adapter.</dd>
1091 <dt><code>firmware_version</code></dt>
1092 <dd>The version string of the network adapter's firmware, if
1096 <dt><code>source_ip</code></dt>
1097 <dd>The source IP address used for an IPv4 tunnel end-point,
1098 such as <code>gre</code> or <code>capwap</code>.</dd>
1101 <dt><code>tunnel_egress_iface</code></dt>
1102 <dd>Egress interface for tunnels. Currently only relevant for GRE
1103 and CAPWAP tunnels. On Linux systems, this column will show
1104 the name of the interface which is responsible for routing
1105 traffic destined for the configured <code>remote_ip</code>.
1106 This could be an internal interface such as a bridge port.</dd>
1109 <dt><code>tunnel_egress_iface_carrier</code></dt>
1110 <dd>Whether a carrier is detected on <ref
1111 column="tunnel_egress_iface"/>. Valid values are <code>down</code>
1112 and <code>up</code>.</dd>
1117 <group title="Ingress Policing">
1119 These settings control ingress policing for packets received on this
1120 interface. On a physical interface, this limits the rate at which
1121 traffic is allowed into the system from the outside; on a virtual
1122 interface (one connected to a virtual machine), this limits the rate at
1123 which the VM is able to transmit.
1126 Policing is a simple form of quality-of-service that simply drops
1127 packets received in excess of the configured rate. Due to its
1128 simplicity, policing is usually less accurate and less effective than
1129 egress QoS (which is configured using the <ref table="QoS"/> and <ref
1130 table="Queue"/> tables).
1133 Policing is currently implemented only on Linux. The Linux
1134 implementation uses a simple ``token bucket'' approach:
1138 The size of the bucket corresponds to <ref
1139 column="ingress_policing_burst"/>. Initially the bucket is full.
1142 Whenever a packet is received, its size (converted to tokens) is
1143 compared to the number of tokens currently in the bucket. If the
1144 required number of tokens are available, they are removed and the
1145 packet is forwarded. Otherwise, the packet is dropped.
1148 Whenever it is not full, the bucket is refilled with tokens at the
1149 rate specified by <ref column="ingress_policing_rate"/>.
1153 Policing interacts badly with some network protocols, and especially
1154 with fragmented IP packets. Suppose that there is enough network
1155 activity to keep the bucket nearly empty all the time. Then this token
1156 bucket algorithm will forward a single packet every so often, with the
1157 period depending on packet size and on the configured rate. All of the
1158 fragments of an IP packets are normally transmitted back-to-back, as a
1159 group. In such a situation, therefore, only one of these fragments
1160 will be forwarded and the rest will be dropped. IP does not provide
1161 any way for the intended recipient to ask for only the remaining
1162 fragments. In such a case there are two likely possibilities for what
1163 will happen next: either all of the fragments will eventually be
1164 retransmitted (as TCP will do), in which case the same problem will
1165 recur, or the sender will not realize that its packet has been dropped
1166 and data will simply be lost (as some UDP-based protocols will do).
1167 Either way, it is possible that no forward progress will ever occur.
1169 <column name="ingress_policing_rate">
1171 Maximum rate for data received on this interface, in kbps. Data
1172 received faster than this rate is dropped. Set to <code>0</code>
1173 (the default) to disable policing.
1177 <column name="ingress_policing_burst">
1178 <p>Maximum burst size for data received on this interface, in kb. The
1179 default burst size if set to <code>0</code> is 1000 kb. This value
1180 has no effect if <ref column="ingress_policing_rate"/>
1181 is <code>0</code>.</p>
1183 Specifying a larger burst size lets the algorithm be more forgiving,
1184 which is important for protocols like TCP that react severely to
1185 dropped packets. The burst size should be at least the size of the
1186 interface's MTU. Specifying a value that is numerically at least as
1187 large as 10% of <ref column="ingress_policing_rate"/> helps TCP come
1188 closer to achieving the full rate.
1193 <group title="Other Features">
1195 <column name="monitor">
1196 Connectivity monitor configuration for this interface.
1199 <column name="external_ids">
1200 Key-value pairs for use by external frameworks that integrate
1201 with Open vSwitch, rather than by Open vSwitch itself. System
1202 integrators should either use the Open vSwitch development
1203 mailing list to coordinate on common key-value definitions, or
1204 choose key names that are likely to be unique. The currently
1205 defined common key-value pairs are:
1207 <dt><code>attached-mac</code></dt>
1209 The MAC address programmed into the ``virtual hardware'' for this
1210 interface, in the form
1211 <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>.
1212 For Citrix XenServer, this is the value of the <code>MAC</code>
1213 field in the VIF record for this interface.</dd>
1214 <dt><code>iface-id</code></dt>
1215 <dd>A system-unique identifier for the interface. On XenServer,
1216 this will commonly be the same as <code>xs-vif-uuid</code>.</dd>
1219 Additionally the following key-value pairs specifically
1220 apply to an interface that represents a virtual Ethernet interface
1221 connected to a virtual machine. These key-value pairs should not be
1222 present for other types of interfaces. Keys whose names end
1223 in <code>-uuid</code> have values that uniquely identify the entity
1224 in question. For a Citrix XenServer hypervisor, these values are
1225 UUIDs in RFC 4122 format. Other hypervisors may use other
1228 <p>The currently defined key-value pairs for XenServer are:</p>
1230 <dt><code>xs-vif-uuid</code></dt>
1231 <dd>The virtual interface associated with this interface.</dd>
1232 <dt><code>xs-network-uuid</code></dt>
1233 <dd>The virtual network to which this interface is attached.</dd>
1234 <dt><code>xs-vm-uuid</code></dt>
1235 <dd>The VM to which this interface belongs.</dd>
1239 <column name="other_config">
1240 Key-value pairs for rarely used interface features.
1242 <dt><code>lacp-port-priority</code></dt>
1243 <dd> The LACP port priority of this <ref table="Interface"/>. In
1244 LACP negotiations <ref table="Interface"/>s with numerically lower
1245 priorities are preferred for aggregation. Must be a number between
1250 <column name="statistics">
1252 Key-value pairs that report interface statistics. The current
1253 implementation updates these counters periodically. In the future,
1254 we plan to, instead, update them when an interface is created, when
1255 they are queried (e.g. using an OVSDB <code>select</code> operation),
1256 and just before an interface is deleted due to virtual interface
1257 hot-unplug or VM shutdown, and perhaps at other times, but not on any
1258 regular periodic basis.</p>
1260 The currently defined key-value pairs are listed below. These are
1261 the same statistics reported by OpenFlow in its <code>struct
1262 ofp_port_stats</code> structure. If an interface does not support a
1263 given statistic, then that pair is omitted.</p>
1266 Successful transmit and receive counters:
1268 <dt><code>rx_packets</code></dt>
1269 <dd>Number of received packets.</dd>
1270 <dt><code>rx_bytes</code></dt>
1271 <dd>Number of received bytes.</dd>
1272 <dt><code>tx_packets</code></dt>
1273 <dd>Number of transmitted packets.</dd>
1274 <dt><code>tx_bytes</code></dt>
1275 <dd>Number of transmitted bytes.</dd>
1281 <dt><code>rx_dropped</code></dt>
1282 <dd>Number of packets dropped by RX.</dd>
1283 <dt><code>rx_frame_err</code></dt>
1284 <dd>Number of frame alignment errors.</dd>
1285 <dt><code>rx_over_err</code></dt>
1286 <dd>Number of packets with RX overrun.</dd>
1287 <dt><code>rx_crc_err</code></dt>
1288 <dd>Number of CRC errors.</dd>
1289 <dt><code>rx_errors</code></dt>
1291 Total number of receive errors, greater than or equal
1292 to the sum of the above.
1299 <dt><code>tx_dropped</code></dt>
1300 <dd>Number of packets dropped by TX.</dd>
1301 <dt><code>collisions</code></dt>
1302 <dd>Number of collisions.</dd>
1303 <dt><code>tx_errors</code></dt>
1305 Total number of transmit errors, greater
1306 than or equal to the sum of the above.
1315 <table name="QoS" title="Quality of Service configuration">
1316 <p>Quality of Service (QoS) configuration for each Port that
1319 <column name="type">
1320 <p>The type of QoS to implement. The <ref table="Open_vSwitch"
1321 column="capabilities"/> column in the <ref table="Open_vSwitch"/> table
1322 identifies the types that a switch actually supports. The currently
1323 defined types are listed below:</p>
1325 <dt><code>linux-htb</code></dt>
1327 Linux ``hierarchy token bucket'' classifier. See tc-htb(8) (also at
1328 <code>http://linux.die.net/man/8/tc-htb</code>) and the HTB manual
1329 (<code>http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm</code>)
1330 for information on how this classifier works and how to configure it.
1334 <dt><code>linux-hfsc</code></dt>
1336 Linux "Hierarchical Fair Service Curve" classifier.
1337 See <code>http://linux-ip.net/articles/hfsc.en/</code> for
1338 information on how this classifier works.
1343 <column name="queues">
1344 <p>A map from queue numbers to <ref table="Queue"/> records. The
1345 supported range of queue numbers depend on <ref column="type"/>. The
1346 queue numbers are the same as the <code>queue_id</code> used in
1347 OpenFlow in <code>struct ofp_action_enqueue</code> and other
1348 structures. Queue 0 is used by OpenFlow output actions that do not
1349 specify a specific queue.</p>
1352 <column name="other_config">
1353 <p>Key-value pairs for configuring QoS features that depend on
1354 <ref column="type"/>.</p>
1355 <p>The <code>linux-htb</code> and <code>linux-hfsc</code> classes support
1356 the following key-value pairs:</p>
1358 <dt><code>max-rate</code></dt>
1359 <dd>Maximum rate shared by all queued traffic, in bit/s.
1360 Optional. If not specified, for physical interfaces, the
1361 default is the link rate. For other interfaces or if the
1362 link rate cannot be determined, the default is currently 100
1367 <column name="external_ids">
1368 Key-value pairs for use by external frameworks that integrate with Open
1369 vSwitch, rather than by Open vSwitch itself. System integrators should
1370 either use the Open vSwitch development mailing list to coordinate on
1371 common key-value definitions, or choose key names that are likely to be
1372 unique. No common key-value pairs are currently defined.
1376 <table name="Queue" title="QoS output queue.">
1377 <p>A configuration for a port output queue, used in configuring Quality of
1378 Service (QoS) features. May be referenced by <ref column="queues"
1379 table="QoS"/> column in <ref table="QoS"/> table.</p>
1381 <column name="other_config">
1382 <p>Key-value pairs for configuring the output queue. The supported
1383 key-value pairs and their meanings depend on the <ref column="type"/>
1384 of the <ref column="QoS"/> records that reference this row.</p>
1385 <p>The key-value pairs defined for <ref table="QoS"/> <ref table="QoS"
1386 column="type"/> of <code>min-rate</code> are:</p>
1388 <dt><code>min-rate</code></dt>
1389 <dd>Minimum guaranteed bandwidth, in bit/s. Required. The
1390 floor value is 1500 bytes/s (12,000 bit/s).</dd>
1392 <p>The key-value pairs defined for <ref table="QoS"/> <ref table="QoS"
1393 column="type"/> of <code>linux-htb</code> are:</p>
1395 <dt><code>min-rate</code></dt>
1396 <dd>Minimum guaranteed bandwidth, in bit/s.</dd>
1397 <dt><code>max-rate</code></dt>
1398 <dd>Maximum allowed bandwidth, in bit/s. Optional. If specified, the
1399 queue's rate will not be allowed to exceed the specified value, even
1400 if excess bandwidth is available. If unspecified, defaults to no
1402 <dt><code>burst</code></dt>
1403 <dd>Burst size, in bits. This is the maximum amount of ``credits''
1404 that a queue can accumulate while it is idle. Optional. Details of
1405 the <code>linux-htb</code> implementation require a minimum burst
1406 size, so a too-small <code>burst</code> will be silently
1408 <dt><code>priority</code></dt>
1409 <dd>A nonnegative 32-bit integer. Defaults to 0 if
1410 unspecified. A queue with a smaller <code>priority</code>
1411 will receive all the excess bandwidth that it can use before
1412 a queue with a larger value receives any. Specific priority
1413 values are unimportant; only relative ordering matters.</dd>
1415 <p>The key-value pairs defined for <ref table="QoS"/> <ref table="QoS"
1416 column="type"/> of <code>linux-hfsc</code> are:</p>
1418 <dt><code>min-rate</code></dt>
1419 <dd>Minimum guaranteed bandwidth, in bit/s.</dd>
1420 <dt><code>max-rate</code></dt>
1421 <dd>Maximum allowed bandwidth, in bit/s. Optional. If specified, the
1422 queue's rate will not be allowed to exceed the specified value, even
1423 if excess bandwidth is available. If unspecified, defaults to no
1428 <column name="external_ids">
1429 Key-value pairs for use by external frameworks that integrate with Open
1430 vSwitch, rather than by Open vSwitch itself. System integrators should
1431 either use the Open vSwitch development mailing list to coordinate on
1432 common key-value definitions, or choose key names that are likely to be
1433 unique. No common key-value pairs are currently defined.
1437 <table name="Monitor" title="Connectivity Monitor configuration">
1439 A <ref table="Monitor"/> attaches to an <ref table="Interface"/> to
1440 implement 802.1ag Connectivity Fault Management (CFM). CFM allows a
1441 group of Maintenance Points (MPs) called a Maintenance Association (MA)
1442 to detect connectivity problems with each other. MPs within a MA should
1443 have complete and exclusive interconnectivity. This is verified by
1444 occasionally broadcasting Continuity Check Messages (CCMs) at a
1445 configurable transmission interval. A <ref table="Monitor"/> is
1446 responsible for collecting data about other MPs in its MA and
1450 <group title="Monitor Configuration">
1451 <column name="mpid">
1452 A Maintenance Point ID (MPID) uniquely identifies each endpoint within
1453 a Maintenance Association (see <ref column="ma_name"/>). The MPID is
1454 used to identify this <ref table="Monitor"/> to other endpoints in the
1458 <column name="remote_mps">
1459 A set of <ref table="Maintenance_Points"/> which this
1460 <ref table="Monitor"/> should have connectivity to. If this
1461 <ref table="Monitor"/> does not have connectivity to any MPs in this
1462 set, or has connectivity to any MPs not in this set, a fault is
1466 <column name="ma_name">
1467 A Maintenance Association (MA) name pairs with a Maintenance Domain
1468 (MD) name to uniquely identify a MA. A MA is a group of endpoints who
1469 have complete and exclusive interconnectivity. Defaults to
1470 <code>ovs</code> if unset.
1473 <column name="md_name">
1474 A Maintenance Domain name pairs with a Maintenance Association name to
1475 uniquely identify a MA. Defaults to <code>ovs</code> if unset.
1478 <column name="interval">
1479 The transmission interval of CCMs in milliseconds. Three missed CCMs
1480 indicate a connectivity fault. Defaults to 1000ms.
1484 <group title="Monitor Status">
1485 <column name="fault">
1486 Indicates a Connectivity Fault caused by a configuration error, a down
1487 remote MP, or unexpected connectivity to a remote MAID or remote MP.
1492 <table name="Maintenance_Point" title="Maintenance Point configuration">
1494 A <ref table="Maintenance_Point"/> represents a MP which a
1495 <ref table="Monitor"/> has or should have connectivity to.
1498 <group title="Maintenance_Point Configuration">
1499 <column name="mpid">
1500 A Maintenance Point ID (MPID) uniquely identifies each endpoint within
1501 a Maintenance Association. All MPs within a MA should have a unique
1506 <group title="Maintenance_Point Status">
1507 <column name="fault">
1508 Indicates a connectivity fault.
1513 <table name="Mirror" title="Port mirroring (SPAN/RSPAN).">
1514 <p>A port mirror within a <ref table="Bridge"/>.</p>
1515 <p>A port mirror configures a bridge to send selected frames to special
1516 ``mirrored'' ports, in addition to their normal destinations. Mirroring
1517 traffic may also be referred to as SPAN or RSPAN, depending on the
1518 mechanism used for delivery.</p>
1520 <column name="name">
1521 Arbitrary identifier for the <ref table="Mirror"/>.
1524 <group title="Selecting Packets for Mirroring">
1526 To be selected for mirroring, a given packet must enter or leave the
1527 bridge through a selected port and it must also be in one of the
1531 <column name="select_all">
1532 If true, every packet arriving or departing on any port is
1533 selected for mirroring.
1536 <column name="select_dst_port">
1537 Ports on which departing packets are selected for mirroring.
1540 <column name="select_src_port">
1541 Ports on which arriving packets are selected for mirroring.
1544 <column name="select_vlan">
1545 VLANs on which packets are selected for mirroring. An empty set
1546 selects packets on all VLANs.
1550 <group title="Mirroring Destination Configuration">
1552 These columns are mutually exclusive. Exactly one of them must be
1556 <column name="output_port">
1557 <p>Output port for selected packets, if nonempty.</p>
1558 <p>Specifying a port for mirror output reserves that port exclusively
1559 for mirroring. No frames other than those selected for mirroring
1560 will be forwarded to the port, and any frames received on the port
1561 will be discarded.</p>
1562 <p>This type of mirroring is sometimes called SPAN.</p>
1565 <column name="output_vlan">
1566 <p>Output VLAN for selected packets, if nonempty.</p>
1567 <p>The frames will be sent out all ports that trunk
1568 <ref column="output_vlan"/>, as well as any ports with implicit VLAN
1569 <ref column="output_vlan"/>. When a mirrored frame is sent out a
1570 trunk port, the frame's VLAN tag will be set to
1571 <ref column="output_vlan"/>, replacing any existing tag; when it is
1572 sent out an implicit VLAN port, the frame will not be tagged. This
1573 type of mirroring is sometimes called RSPAN.</p>
1574 <p><em>Please note:</em> Mirroring to a VLAN can disrupt a network that
1575 contains unmanaged switches. Consider an unmanaged physical switch
1576 with two ports: port 1, connected to an end host, and port 2,
1577 connected to an Open vSwitch configured to mirror received packets
1578 into VLAN 123 on port 2. Suppose that the end host sends a packet on
1579 port 1 that the physical switch forwards to port 2. The Open vSwitch
1580 forwards this packet to its destination and then reflects it back on
1581 port 2 in VLAN 123. This reflected packet causes the unmanaged
1582 physical switch to replace the MAC learning table entry, which
1583 correctly pointed to port 1, with one that incorrectly points to port
1584 2. Afterward, the physical switch will direct packets destined for
1585 the end host to the Open vSwitch on port 2, instead of to the end
1586 host on port 1, disrupting connectivity. If mirroring to a VLAN is
1587 desired in this scenario, then the physical switch must be replaced
1588 by one that learns Ethernet addresses on a per-VLAN basis. In
1589 addition, learning should be disabled on the VLAN containing mirrored
1590 traffic. If this is not done then intermediate switches will learn
1591 the MAC address of each end host from the mirrored traffic. If
1592 packets being sent to that end host are also mirrored, then they will
1593 be dropped since the switch will attempt to send them out the input
1594 port. Disabling learning for the VLAN will cause the switch to
1595 correctly send the packet out all ports configured for that VLAN. If
1596 Open vSwitch is being used as an intermediate switch, learning can be
1597 disabled by adding the mirrored VLAN to <ref column="flood_vlans"/>
1598 in the appropriate <ref table="Bridge"/> table or tables.</p>
1602 <group title="Other Features">
1603 <column name="external_ids">
1604 Key-value pairs for use by external frameworks that integrate with Open
1605 vSwitch, rather than by Open vSwitch itself. System integrators should
1606 either use the Open vSwitch development mailing list to coordinate on
1607 common key-value definitions, or choose key names that are likely to be
1608 unique. No common key-value pairs are currently defined.
1613 <table name="Controller" title="OpenFlow controller configuration.">
1614 <p>An OpenFlow controller.</p>
1617 Open vSwitch supports two kinds of OpenFlow controllers:
1621 <dt>Primary controllers</dt>
1624 This is the kind of controller envisioned by the OpenFlow 1.0
1625 specification. Usually, a primary controller implements a network
1626 policy by taking charge of the switch's flow table.
1630 Open vSwitch initiates and maintains persistent connections to
1631 primary controllers, retrying the connection each time it fails or
1632 drops. The <ref table="Bridge" column="fail_mode"/> column in the
1633 <ref table="Bridge"/> table applies to primary controllers.
1637 Open vSwitch permits a bridge to have any number of primary
1638 controllers. When multiple controllers are configured, Open
1639 vSwitch connects to all of them simultaneously. Because
1640 OpenFlow 1.0 does not specify how multiple controllers
1641 coordinate in interacting with a single switch, more than
1642 one primary controller should be specified only if the
1643 controllers are themselves designed to coordinate with each
1644 other. (The Nicira-defined <code>NXT_ROLE</code> OpenFlow
1645 vendor extension may be useful for this.)
1648 <dt>Service controllers</dt>
1651 These kinds of OpenFlow controller connections are intended for
1652 occasional support and maintenance use, e.g. with
1653 <code>ovs-ofctl</code>. Usually a service controller connects only
1654 briefly to inspect or modify some of a switch's state.
1658 Open vSwitch listens for incoming connections from service
1659 controllers. The service controllers initiate and, if necessary,
1660 maintain the connections from their end. The <ref table="Bridge"
1661 column="fail_mode"/> column in the <ref table="Bridge"/> table does
1662 not apply to service controllers.
1666 Open vSwitch supports configuring any number of service controllers.
1672 The <ref column="target"/> determines the type of controller.
1675 <group title="Core Features">
1676 <column name="target">
1677 <p>Connection method for controller.</p>
1679 The following connection methods are currently supported for primary
1683 <dt><code>ssl:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
1685 <p>The specified SSL <var>port</var> (default: 6633) on the host at
1686 the given <var>ip</var>, which must be expressed as an IP address
1687 (not a DNS name). The <ref table="Open_vSwitch" column="ssl"/>
1688 column in the <ref table="Open_vSwitch"/> table must point to a
1689 valid SSL configuration when this form is used.</p>
1690 <p>SSL support is an optional feature that is not always built as
1691 part of Open vSwitch.</p>
1693 <dt><code>tcp:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
1694 <dd>The specified TCP <var>port</var> (default: 6633) on the host at
1695 the given <var>ip</var>, which must be expressed as an IP address
1696 (not a DNS name).</dd>
1699 The following connection methods are currently supported for service
1703 <dt><code>pssl:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
1706 Listens for SSL connections on the specified TCP <var>port</var>
1707 (default: 6633). If <var>ip</var>, which must be expressed as an
1708 IP address (not a DNS name), is specified, then connections are
1709 restricted to the specified local IP address.
1712 The <ref table="Open_vSwitch" column="ssl"/> column in the <ref
1713 table="Open_vSwitch"/> table must point to a valid SSL
1714 configuration when this form is used.
1716 <p>SSL support is an optional feature that is not always built as
1717 part of Open vSwitch.</p>
1719 <dt><code>ptcp:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
1721 Listens for connections on the specified TCP <var>port</var>
1722 (default: 6633). If <var>ip</var>, which must be expressed as an
1723 IP address (not a DNS name), is specified, then connections are
1724 restricted to the specified local IP address.
1727 <p>When multiple controllers are configured for a single bridge, the
1728 <ref column="target"/> values must be unique. Duplicate
1729 <ref column="target"/> values yield unspecified results.</p>
1732 <column name="connection_mode">
1733 <p>If it is specified, this setting must be one of the following
1734 strings that describes how Open vSwitch contacts this OpenFlow
1735 controller over the network:</p>
1738 <dt><code>in-band</code></dt>
1739 <dd>In this mode, this controller's OpenFlow traffic travels over the
1740 bridge associated with the controller. With this setting, Open
1741 vSwitch allows traffic to and from the controller regardless of the
1742 contents of the OpenFlow flow table. (Otherwise, Open vSwitch
1743 would never be able to connect to the controller, because it did
1744 not have a flow to enable it.) This is the most common connection
1745 mode because it is not necessary to maintain two independent
1747 <dt><code>out-of-band</code></dt>
1748 <dd>In this mode, OpenFlow traffic uses a control network separate
1749 from the bridge associated with this controller, that is, the
1750 bridge does not use any of its own network devices to communicate
1751 with the controller. The control network must be configured
1752 separately, before or after <code>ovs-vswitchd</code> is started.
1756 <p>If not specified, the default is implementation-specific.</p>
1760 <group title="Controller Failure Detection and Handling">
1761 <column name="max_backoff">
1762 Maximum number of milliseconds to wait between connection attempts.
1763 Default is implementation-specific.
1766 <column name="inactivity_probe">
1767 Maximum number of milliseconds of idle time on connection to
1768 controller before sending an inactivity probe message. If Open
1769 vSwitch does not communicate with the controller for the specified
1770 number of seconds, it will send a probe. If a response is not
1771 received for the same additional amount of time, Open vSwitch
1772 assumes the connection has been broken and attempts to reconnect.
1773 Default is implementation-specific.
1777 <group title="OpenFlow Rate Limiting">
1778 <column name="controller_rate_limit">
1779 <p>The maximum rate at which packets in unknown flows will be
1780 forwarded to the OpenFlow controller, in packets per second. This
1781 feature prevents a single bridge from overwhelming the controller.
1782 If not specified, the default is implementation-specific.</p>
1783 <p>In addition, when a high rate triggers rate-limiting, Open
1784 vSwitch queues controller packets for each port and transmits
1785 them to the controller at the configured rate. The number of
1786 queued packets is limited by
1787 the <ref column="controller_burst_limit"/> value. The packet
1788 queue is shared fairly among the ports on a bridge.</p><p>Open
1789 vSwitch maintains two such packet rate-limiters per bridge.
1790 One of these applies to packets sent up to the controller
1791 because they do not correspond to any flow. The other applies
1792 to packets sent up to the controller by request through flow
1793 actions. When both rate-limiters are filled with packets, the
1794 actual rate that packets are sent to the controller is up to
1795 twice the specified rate.</p>
1798 <column name="controller_burst_limit">
1799 In conjunction with <ref column="controller_rate_limit"/>,
1800 the maximum number of unused packet credits that the bridge will
1801 allow to accumulate, in packets. If not specified, the default
1802 is implementation-specific.
1806 <group title="Additional In-Band Configuration">
1807 <p>These values are considered only in in-band control mode (see
1808 <ref column="connection_mode"/>).</p>
1810 <p>When multiple controllers are configured on a single bridge, there
1811 should be only one set of unique values in these columns. If different
1812 values are set for these columns in different controllers, the effect
1815 <column name="local_ip">
1816 The IP address to configure on the local port,
1817 e.g. <code>192.168.0.123</code>. If this value is unset, then
1818 <ref column="local_netmask"/> and <ref column="local_gateway"/> are
1822 <column name="local_netmask">
1823 The IP netmask to configure on the local port,
1824 e.g. <code>255.255.255.0</code>. If <ref column="local_ip"/> is set
1825 but this value is unset, then the default is chosen based on whether
1826 the IP address is class A, B, or C.
1829 <column name="local_gateway">
1830 The IP address of the gateway to configure on the local port, as a
1831 string, e.g. <code>192.168.0.1</code>. Leave this column unset if
1832 this network has no gateway.
1836 <group title="Other Features">
1837 <column name="external_ids">
1838 Key-value pairs for use by external frameworks that integrate with Open
1839 vSwitch, rather than by Open vSwitch itself. System integrators should
1840 either use the Open vSwitch development mailing list to coordinate on
1841 common key-value definitions, or choose key names that are likely to be
1842 unique. No common key-value pairs are currently defined.
1846 <group title="Controller Status">
1847 <column name="is_connected">
1848 <code>true</code> if currently connected to this controller,
1849 <code>false</code> otherwise.
1852 <column name="role">
1853 <p>The level of authority this controller has on the associated
1854 bridge. Possible values are:</p>
1856 <dt><code>other</code></dt>
1857 <dd>Allows the controller access to all OpenFlow features.</dd>
1858 <dt><code>master</code></dt>
1859 <dd>Equivalent to <code>other</code>, except that there may be at
1860 most one master controller at a time. When a controller configures
1861 itself as <code>master</code>, any existing master is demoted to
1862 the <code>slave</code>role.</dd>
1863 <dt><code>slave</code></dt>
1864 <dd>Allows the controller read-only access to OpenFlow features.
1865 Attempts to modify the flow table will be rejected with an
1866 error. Slave controllers do not receive OFPT_PACKET_IN or
1867 OFPT_FLOW_REMOVED messages, but they do receive OFPT_PORT_STATUS
1872 <column name="status">
1873 <p>Key-value pairs that report controller status.</p>
1875 <dt><code>last_error</code></dt>
1876 <dd>A human-readable description of the last error on the connection
1877 to the controller; i.e. <code>strerror(errno)</code>. This key
1878 will exist only if an error has occurred.</dd>
1879 <dt><code>state</code></dt>
1880 <dd>The state of the connection to the controller. Possible values
1881 are: <code>VOID</code> (connection is disabled),
1882 <code>BACKOFF</code> (attempting to reconnect at an increasing
1883 period), <code>CONNECTING</code> (attempting to connect),
1884 <code>ACTIVE</code> (connected, remote host responsive), and
1885 <code>IDLE</code> (remote host idle, sending keep-alive). These
1886 values may change in the future. They are provided only for human
1888 <dt><code>sec_since_connect</code></dt>
1889 <dd>The amount of time since this controller last successfully
1890 connected to the switch (in seconds). Value is empty if controller
1891 has never successfully connected.</dd>
1892 <dt><code>sec_since_disconnect</code></dt>
1893 <dd>The amount of time since this controller last disconnected from
1894 the switch (in seconds). Value is empty if controller has never
1901 <table name="Manager" title="OVSDB management connection.">
1903 Configuration for a database connection to an Open vSwitch database
1908 This table primarily configures the Open vSwitch database
1909 (<code>ovsdb-server</code>), not the Open vSwitch switch
1910 (<code>ovs-vswitchd</code>). The switch does read the table to determine
1911 what connections should be treated as in-band.
1915 The Open vSwitch database server can initiate and maintain active
1916 connections to remote clients. It can also listen for database
1920 <group title="Core Features">
1921 <column name="target">
1922 <p>Connection method for managers.</p>
1924 The following connection methods are currently supported:
1927 <dt><code>ssl:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
1930 The specified SSL <var>port</var> (default: 6632) on the host at
1931 the given <var>ip</var>, which must be expressed as an IP address
1932 (not a DNS name). The <ref table="Open_vSwitch" column="ssl"/>
1933 column in the <ref table="Open_vSwitch"/> table must point to a
1934 valid SSL configuration when this form is used.
1937 SSL support is an optional feature that is not always built as
1938 part of Open vSwitch.
1942 <dt><code>tcp:<var>ip</var></code>[<code>:<var>port</var></code>]</dt>
1944 The specified TCP <var>port</var> (default: 6632) on the host at
1945 the given <var>ip</var>, which must be expressed as an IP address
1948 <dt><code>pssl:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
1951 Listens for SSL connections on the specified TCP <var>port</var>
1952 (default: 6632). If <var>ip</var>, which must be expressed as an
1953 IP address (not a DNS name), is specified, then connections are
1954 restricted to the specified local IP address.
1957 The <ref table="Open_vSwitch" column="ssl"/> column in the <ref
1958 table="Open_vSwitch"/> table must point to a valid SSL
1959 configuration when this form is used.
1962 SSL support is an optional feature that is not always built as
1963 part of Open vSwitch.
1966 <dt><code>ptcp:</code>[<var>port</var>][<code>:<var>ip</var></code>]</dt>
1968 Listens for connections on the specified TCP <var>port</var>
1969 (default: 6632). If <var>ip</var>, which must be expressed as an
1970 IP address (not a DNS name), is specified, then connections are
1971 restricted to the specified local IP address.
1974 <p>When multiple managers are configured, the <ref column="target"/>
1975 values must be unique. Duplicate <ref column="target"/> values yield
1976 unspecified results.</p>
1979 <column name="connection_mode">
1981 If it is specified, this setting must be one of the following strings
1982 that describes how Open vSwitch contacts this OVSDB client over the
1987 <dt><code>in-band</code></dt>
1989 In this mode, this connection's traffic travels over a bridge
1990 managed by Open vSwitch. With this setting, Open vSwitch allows
1991 traffic to and from the client regardless of the contents of the
1992 OpenFlow flow table. (Otherwise, Open vSwitch would never be able
1993 to connect to the client, because it did not have a flow to enable
1994 it.) This is the most common connection mode because it is not
1995 necessary to maintain two independent networks.
1997 <dt><code>out-of-band</code></dt>
1999 In this mode, the client's traffic uses a control network separate
2000 from that managed by Open vSwitch, that is, Open vSwitch does not
2001 use any of its own network devices to communicate with the client.
2002 The control network must be configured separately, before or after
2003 <code>ovs-vswitchd</code> is started.
2008 If not specified, the default is implementation-specific.
2013 <group title="Client Failure Detection and Handling">
2014 <column name="max_backoff">
2015 Maximum number of milliseconds to wait between connection attempts.
2016 Default is implementation-specific.
2019 <column name="inactivity_probe">
2020 Maximum number of milliseconds of idle time on connection to the client
2021 before sending an inactivity probe message. If Open vSwitch does not
2022 communicate with the client for the specified number of seconds, it
2023 will send a probe. If a response is not received for the same
2024 additional amount of time, Open vSwitch assumes the connection has been
2025 broken and attempts to reconnect. Default is implementation-specific.
2029 <group title="Other Features">
2030 <column name="external_ids">
2031 Key-value pairs for use by external frameworks that integrate with Open
2032 vSwitch, rather than by Open vSwitch itself. System integrators should
2033 either use the Open vSwitch development mailing list to coordinate on
2034 common key-value definitions, or choose key names that are likely to be
2035 unique. No common key-value pairs are currently defined.
2039 <group title="Status">
2040 <column name="is_connected">
2041 <code>true</code> if currently connected to this manager,
2042 <code>false</code> otherwise.
2045 <column name="status">
2046 <p>Key-value pairs that report manager status.</p>
2048 <dt><code>last_error</code></dt>
2049 <dd>A human-readable description of the last error on the connection
2050 to the manager; i.e. <code>strerror(errno)</code>. This key
2051 will exist only if an error has occurred.</dd>
2054 <dt><code>state</code></dt>
2055 <dd>The state of the connection to the manager. Possible values
2056 are: <code>VOID</code> (connection is disabled),
2057 <code>BACKOFF</code> (attempting to reconnect at an increasing
2058 period), <code>CONNECTING</code> (attempting to connect),
2059 <code>ACTIVE</code> (connected, remote host responsive), and
2060 <code>IDLE</code> (remote host idle, sending keep-alive). These
2061 values may change in the future. They are provided only for human
2065 <dt><code>sec_since_connect</code></dt>
2066 <dd>The amount of time since this manager last successfully connected
2067 to the database (in seconds). Value is empty if manager has never
2068 successfully connected.</dd>
2071 <dt><code>sec_since_disconnect</code></dt>
2072 <dd>The amount of time since this manager last disconnected from the
2073 database (in seconds). Value is empty if manager has never
2080 <table name="NetFlow">
2081 A NetFlow target. NetFlow is a protocol that exports a number of
2082 details about terminating IP flows, such as the principals involved
2085 <column name="targets">
2086 NetFlow targets in the form
2087 <code><var>ip</var>:<var>port</var></code>. The <var>ip</var>
2088 must be specified numerically, not as a DNS name.
2091 <column name="engine_id">
2092 Engine ID to use in NetFlow messages. Defaults to datapath index
2096 <column name="engine_type">
2097 Engine type to use in NetFlow messages. Defaults to datapath
2098 index if not specified.
2101 <column name="active_timeout">
2102 The interval at which NetFlow records are sent for flows that are
2103 still active, in seconds. A value of <code>0</code> requests the
2104 default timeout (currently 600 seconds); a value of <code>-1</code>
2105 disables active timeouts.
2108 <column name="add_id_to_interface">
2109 <p>If this column's value is <code>false</code>, the ingress and egress
2110 interface fields of NetFlow flow records are derived from OpenFlow port
2111 numbers. When it is <code>true</code>, the 7 most significant bits of
2112 these fields will be replaced by the least significant 7 bits of the
2113 engine id. This is useful because many NetFlow collectors do not
2114 expect multiple switches to be sending messages from the same host, so
2115 they do not store the engine information which could be used to
2116 disambiguate the traffic.</p>
2117 <p>When this option is enabled, a maximum of 508 ports are supported.</p>
2120 <column name="external_ids">
2121 Key-value pairs for use by external frameworks that integrate with Open
2122 vSwitch, rather than by Open vSwitch itself. System integrators should
2123 either use the Open vSwitch development mailing list to coordinate on
2124 common key-value definitions, or choose key names that are likely to be
2125 unique. No common key-value pairs are currently defined.
2130 SSL configuration for an Open_vSwitch.
2132 <column name="private_key">
2133 Name of a PEM file containing the private key used as the switch's
2134 identity for SSL connections to the controller.
2137 <column name="certificate">
2138 Name of a PEM file containing a certificate, signed by the
2139 certificate authority (CA) used by the controller and manager,
2140 that certifies the switch's private key, identifying a trustworthy
2144 <column name="ca_cert">
2145 Name of a PEM file containing the CA certificate used to verify
2146 that the switch is connected to a trustworthy controller.
2149 <column name="bootstrap_ca_cert">
2150 If set to <code>true</code>, then Open vSwitch will attempt to
2151 obtain the CA certificate from the controller on its first SSL
2152 connection and save it to the named PEM file. If it is successful,
2153 it will immediately drop the connection and reconnect, and from then
2154 on all SSL connections must be authenticated by a certificate signed
2155 by the CA certificate thus obtained. <em>This option exposes the
2156 SSL connection to a man-in-the-middle attack obtaining the initial
2157 CA certificate.</em> It may still be useful for bootstrapping.
2160 <column name="external_ids">
2161 Key-value pairs for use by external frameworks that integrate with Open
2162 vSwitch, rather than by Open vSwitch itself. System integrators should
2163 either use the Open vSwitch development mailing list to coordinate on
2164 common key-value definitions, or choose key names that are likely to be
2165 unique. No common key-value pairs are currently defined.
2169 <table name="sFlow">
2170 <p>An sFlow(R) target. sFlow is a protocol for remote monitoring
2173 <column name="agent">
2174 Name of the network device whose IP address should be reported as the
2175 ``agent address'' to collectors. If not specified, the IP address
2176 defaults to the <ref table="Controller" column="local_ip"/> in the
2177 collector's <ref table="Controller"/>. If an agent IP address cannot be
2178 determined either way, sFlow is disabled.
2181 <column name="header">
2182 Number of bytes of a sampled packet to send to the collector.
2183 If not specified, the default is 128 bytes.
2186 <column name="polling">
2187 Polling rate in seconds to send port statistics to the collector.
2188 If not specified, defaults to 30 seconds.
2191 <column name="sampling">
2192 Rate at which packets should be sampled and sent to the collector.
2193 If not specified, defaults to 400, which means one out of 400
2194 packets, on average, will be sent to the collector.
2197 <column name="targets">
2198 sFlow targets in the form
2199 <code><var>ip</var>:<var>port</var></code>.
2202 <column name="external_ids">
2203 Key-value pairs for use by external frameworks that integrate with Open
2204 vSwitch, rather than by Open vSwitch itself. System integrators should
2205 either use the Open vSwitch development mailing list to coordinate on
2206 common key-value definitions, or choose key names that are likely to be
2207 unique. No common key-value pairs are currently defined.
2211 <table name="Capability">
2212 <p>Records in this table describe functionality supported by the hardware
2213 and software platform on which this Open vSwitch is based. Clients
2214 should not modify this table.</p>
2216 <p>A record in this table is meaningful only if it is referenced by the
2217 <ref table="Open_vSwitch" column="capabilities"/> column in the
2218 <ref table="Open_vSwitch"/> table. The key used to reference it, called
2219 the record's ``category,'' determines the meanings of the
2220 <ref column="details"/> column. The following general forms of
2221 categories are currently defined:</p>
2224 <dt><code>qos-<var>type</var></code></dt>
2225 <dd><var>type</var> is supported as the value for
2226 <ref column="type" table="QoS"/> in the <ref table="QoS"/> table.
2230 <column name="details">
2231 <p>Key-value pairs that describe capabilities. The meaning of the pairs
2232 depends on the category key that the <ref table="Open_vSwitch"
2233 column="capabilities"/> column in the <ref table="Open_vSwitch"/> table
2234 uses to reference this record, as described above.</p>
2236 <p>The presence of a record for category <code>qos-<var>type</var></code>
2237 indicates that the switch supports <var>type</var> as the value of
2238 the <ref table="QoS" column="type"/> column in the <ref table="QoS"/>
2239 table. The following key-value pairs are defined to further describe
2240 QoS capabilities:</p>
2243 <dt><code>n-queues</code></dt>
2244 <dd>Number of supported queues, as a positive integer. Keys in the
2245 <ref table="QoS" column="queues"/> column for <ref table="QoS"/>
2246 records whose <ref table="QoS" column="type"/> value
2247 equals <var>type</var> must range between 0 and this value minus one,
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