- A number of flows as a nonnegative integer. This sets number of - flows at which eviction from the datapath flow table will be - triggered. If there are a large number of flows then increasing this - value to around the number of flows present can result in reduced CPU - usage and packet loss. + The maximum + number of flows allowed in the datapath flow table. Internally OVS + will choose a flow limit which will likely be lower than this number, + based on real time network conditions.
- The default is 2500. Values below 100 will be rounded up to 100. + The default is 200000.
+ Specifies the number of threads for software datapaths to use for + handling new flows. The default the number of online CPU cores minus + the number of revalidators. +
+
+ This configuration is per datapath. If you have more than one
+ software datapath (e.g. some system bridges and some
+ netdev bridges), then the total number of threads is
+ n-handler-threads times the number of software
+ datapaths.
+
- Specifies userspace behaviour for handling flow misses. This takes
- precedence over flow-eviction-threshold.
+ Specifies the number of threads for software datapaths to use for
+ revalidating flows in the datapath. Typically, there is a direct
+ correlation between the number of revalidator threads, and the number
+ of flows allowed in the datapath. The default is the number of cpu
+ cores divided by four plus one. If n-handler-threads is
+ set, the default changes to the number of cpu cores minus the number
+ of handler threads.
-
autowith-facetswithout-facetssystem bridges and some
+ netdev bridges), then the total number of threads is
+ n-handler-threads times the number of software
+ datapaths.
OpenFlow10 will be used if this column is empty.
+ + List of OpenFlow protocols that may be used when negotiating + a connection with a controller. OpenFlow 1.0, 1.1, 1.2, and + 1.3 are enabled by default if this column is empty. +
+ +
+ The current implementation of OpenFlow 1.4 support is not safe:
+ ovs-vswitchd will abort when certain unimplemented
+ features are tested. Thus, for now it is suitable only for
+ experimental use. For this reason, OpenFlow 1.4 is supported only
+ if, in addition to specifying OpenFlow14 in this field,
+ ovs-vswitchd is invoked with the
+ --enable-of14 option. (When support becomes safe, this
+ option will be removed.)
+
The following modes require the upstream switch to support 802.3ad with
- successful LACP negotiation:
+ successful LACP negotiation. If LACP negotiation fails and
+ other-config:lacp-fallback-ab is true, then active-backup
+ mode is used:
off if unset.
+ disabled, unless other-config:lacp-fallback-ab is set to true.
+ Defaults to off if unset.
+ Determines the behavior of openvswitch bond in LACP mode. If
+ the partner switch does not support LACP, setting this option
+ to true allows openvswitch to fallback to
+ active-backup. If the option is set to false, the
+ bond will be disabled. In both the cases, once the partner switch
+ is configured to LACP mode, the bond will use LACP.
+
OpenFlow port number for this interface. Unlike most columns, this - column's value should be set only by Open vSwitch itself. Other - clients should set this column to an empty set (the default) when - creating an .
-Open vSwitch populates this column when the port number becomes - known. If the interface is successfully added, - will be set to a number between 1 and 65535 - (generally either in the range 1 to 65279, inclusive, or 65534, the - port number for the OpenFlow ``local port''). If the interface - cannot be added then Open vSwitch sets this column - to -1.
-When is not set, Open vSwitch picks - an appropriate value for this column and then tries to keep the value - constant across restarts.
-Requested OpenFlow port number for this interface. The port - number must be between 1 and 65279, inclusive. Some datapaths - cannot satisfy all requests for particular port numbers. When - this column is empty or the request cannot be fulfilled, the - system will choose a free port. The - column reports the assigned OpenFlow port number.
-The port number must be requested in the same transaction - that creates the port.
-+ When a client adds a new interface, Open vSwitch chooses an OpenFlow + port number for the new port. If the client that adds the port fills + in , then Open vSwitch tries to use its + value as the OpenFlow port number. Otherwise, or if the requested + port number is already in use or cannot be used for another reason, + Open vSwitch automatically assigns a free port number. Regardless of + how the port number was obtained, Open vSwitch then reports in the port number actually assigned. +
+ ++ Open vSwitch limits the port numbers that it automatically assigns to + the range 1 through 32,767, inclusive. Controllers therefore have + free use of ports 32,768 and up. +
+ ++ OpenFlow port number for this interface. Open vSwitch sets this + column's value, so other clients should treat it as read-only. +
+
+ The OpenFlow ``local'' port (OFPP_LOCAL) is 65,534.
+ The other valid port numbers are in the range 1 to 65,279,
+ inclusive. Value -1 indicates an error adding the interface.
+
+ Requested OpenFlow port number for this interface. +
+ ++ A client should ideally set this column's value in the same + database transaction that it uses to create the interface. Open + vSwitch version 2.1 and later will honor a later request for a + specific port number, althuogh it might confuse some controllers: + OpenFlow does not have a way to announce a port number change, so + Open vSwitch represents it over OpenFlow as a port deletion + followed immediately by a port addition. +
+ ++ If is set or changed to some other + port's automatically assigned port number, Open vSwitch chooses a + new port number for the latter port. +
+http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-03.
- VXLAN is currently supported only with the Linux kernel datapath
- with kernel version 2.6.26 or later.
Open vSwitch uses UDP destination port 4789. The source port used for @@ -1337,9 +1402,18 @@
lisp+ A layer 3 tunnel over the experimental, UDP-based Locator/ID + Separation Protocol (RFC 6830). +
++ Only IPv4 and IPv6 packets are supported by the protocol, and + they are sent and received without an Ethernet header. Traffic + to/from LISP ports is expected to be configured explicitly, and + the ports are not intended to participate in learning based + switching. As such, they are always excluded from packet + flooding. +
patch- BFD, defined in RFC 5880 and RFC 5881, allows point to point - detection of connectivity failures by occasional transmission of - BFD control messages. It is implemented in Open vSwitch to serve - as a more popular and standards compliant alternative to CFM. -
- -- BFD operates by regularly transmitting BFD control messages at a - rate negotiated independently in each direction. Each endpoint - specifies the rate at which it expects to receive control messages, - and the rate at which it's willing to transmit them. Open vSwitch - uses a detection multiplier of three, meaning that an endpoint - which fails to receive BFD control messages for a period of three - times the expected reception rate, will signal a connectivity - fault. In the case of a unidirectional connectivity issue, the - system not receiving BFD control messages will signal the problem - to its peer in the messages it transmits. -
- -- The Open vSwitch implementation of BFD aims to comply faithfully - with the requirements put forth in RFC 5880. Currently, the only - known omission is ``Demand Mode'', which we hope to include in - future. Open vSwitch does not implement the optional - Authentication or ``Echo Mode'' features. -
- -true BFD is enabled on this
- , otherwise it's disabled. Defaults to
- false.
- 1000.
- 100.
- cpath_down to
- true which may cause the remote BFD session not to
- forward traffic to this . Defaults to
- false.
- in_key of zero. Defaults to
- false.
- 00:23:20:00:00:01 is used.
- UP.
- + BFD, defined in RFC 5880 and RFC 5881, allows point-to-point + detection of connectivity failures by occasional transmission of + BFD control messages. Open vSwitch implements BFD to serve + as a more popular and standards compliant alternative to CFM. +
-UP, and the remote system isn't signaling a
- problem such as concatenated path down.
- + BFD operates by regularly transmitting BFD control messages at a rate + negotiated independently in each direction. Each endpoint specifies + the rate at which it expects to receive control messages, and the rate + at which it is willing to transmit them. Open vSwitch uses a detection + multiplier of three, meaning that an endpoint signals a connectivity + fault if three consecutive BFD control messages fail to arrive. In the + case of a unidirectional connectivity issue, the system not receiving + BFD control messages signals the problem to its peer in the messages it + transmits. +
-+ The Open vSwitch implementation of BFD aims to comply faithfully + with RFC 5880 requirements. Open vSwitch does not implement the + optional Authentication or ``Echo Mode'' features. +
-+ A controller sets up key-value pairs in the + column to enable and configure BFD. +
+ +1000.
+ 100.
+ true, traffic received on the
+ is used to indicate the capability of packet
+ I/O. BFD control packets are still transmitted and received. At
+ least one BFD control packet must be received every 100 * amount of time. Otherwise, even if
+ traffic are received, the
+ will be false.
+ 00:23:20:00:00:01.
+ 169.254.1.0.
+ 169.254.1.1.
+ + The switch sets key-value pairs in the + column to report the status of BFD on this interface. When BFD is + not enabled, with , the switch clears + all key-value pairs from . +
+ +UP.
+ UP, and the remote
+ system isn't signaling a problem such as concatenated path down.
+ + A Maintenance Point ID (MPID) uniquely identifies each endpoint + within a Maintenance Association. The MPID is used to identify this + endpoint to other Maintenance Points in the MA. Each end of a link + being monitored should have a different MPID. Must be configured to + enable CFM on this . +
++ According to the 802.1ag specification, MPIDs can only range between + [1, 8191]. However, extended mode (see ) supports eight byte MPIDs. +
+cfm_interval configuration parameter by breaking wire
- compatibility with 802.1ag compliant implementations. Defaults to
- false.
+ compatibility with 802.1ag compliant implementations. And extended
+ mode allows eight byte MPIDs. Defaults to false.
@@ -2111,8 +2245,9 @@
+ This string set specifies which fields should be used for + address prefix tracking. Prefix tracking allows the + classifier to skip rules with longer than necessary prefixes, + resulting in better wildcarding for datapath flows. +
++ Prefix tracking may be beneficial when a flow table contains + matches on IP address fields with different prefix lengths. + For example, when a flow table contains IP address matches on + both full addresses and proper prefixes, the full address + matches will typically cause the datapath flow to un-wildcard + the whole address field (depending on flow entry priorities). + In this case each packet with a different address gets handed + to the userspace for flow processing and generates its own + datapath flow. With prefix tracking enabled for the address + field in question packets with addresses matching shorter + prefixes would generate datapath flows where the irrelevant + address bits are wildcarded, allowing the same datapath flow + to handle all the packets within the prefix in question. In + this case many userspace upcalls can be avoided and the + overall performance can be better. +
++ This is a performance optimization only, so packets will + receive the same treatment with or without prefix tracking. +
+
+ The supported fields are: tun_id,
+ tun_src, tun_dst,
+ nw_src, nw_dst (or aliases
+ ip_src and ip_dst),
+ ipv6_src, and ipv6_dst. (Using this
+ feature for tun_id would only make sense if the
+ tunnel IDs have prefix structure similar to IP addresses.)
+
+ For example, prefixes=ip_dst,ip_src instructs the
+ flow classifier to track the IP destination and source
+ addresses used by the rules in this specific flow table. To
+ set the prefix fields, the flow table record needs to exist:
+
ovs-vsctl set Bridge br0 flow_tables:0=@N1 -- --id=@N1 create Flow_Table name=table0ovs-vsctl set Flow_Table table0 prefixes=ip_dst,ip_src+ There is a maximum number of fields that can be enabled for any + one flow table. Currently this limit is 3. +
+Common
+ Columns at the beginning of this document.
+
+