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Default plugins

Default plugins manage basic configuration of VPP. The management of configuration is split among multiple packages. Detailed description can be found in particular READMEs:

Config file

The default plugins can use configuration file defaultplugins.conf to:

  • set global maximum transmission unit
  • enable/disable stopwatch
  • set VPP resync strategy

To run the vpp-agent with defaultplugins.conf:

vpp-agent --defaultplugins-config=/opt/vpp-agent/dev/defaultplugins.conf

MTU

MTU is used in interface plugin. The value is preferred before global setting which is set to 9000 bytes. Mtu is written in config as follows:

mtu: <value>

Stopwatch

Duration of VPP binary api call during resync can be measured using stopwatch. These data are then logged after every partial resync (interfaces, bridge domains, fib entries etc.). Enable stopwatch in defaultplugins.conf:

stopwatch: true or stopwatch: false

Stopwatch is disabled by default (if there is no config available).

Resync Strategy

There are several strategies available for VPP resync:

  • full always performs the full resync of all VPP plugins. This is the default strategy if none is set.
  • optimize-cold-start evaluates the existing configuration in the VPP at first. The state of interfaces is the decision-maker: if there is any interface configured except local0, the resync is performed normally. Otherwise it is skipped. Use it carefully because this strategy does not take into consideration the state of the etcd.

Strategy can be set in defaultplugins.conf:

strategy: full or strategy: optimize

To skip resync completely, start vpp-agent with --skip-vpp-resync parameter. In such a case the resync is skipped (config file resync strategy is not taken into account).