The graceful-restart peer-reset command enables a device to reset a BGP connection in GR mode.
The undo graceful-restart peer-reset command restores the default configuration.
By default, a device is not enabled to reset a BGP connection in GR mode.
Usage Scenario
Currently, BGP does not support dynamic capability negotiation. Therefore, each time a new BGP capability is enabled on a BGP speaker, the BGP speaker tears down existing sessions with its peer and renegotiates BGP capabilities. To prevent the service interruptions, run the graceful-restart peer-reset command to enable the BGP speaker to reset a BGP session in GR mode.
With the GR reset function configured, when you enable a new BGP capability on the BGP speaker, the BGP speaker enters the GR state, resets the BGP session, and renegotiates BGP capabilities with the peer. In the whole process, the BGP speaker re-establishes the existing sessions but does not delete the routing entries for the existing sessions, so that the existing services are not interrupted.
Prerequisites
GR has been enabled by running the graceful-restart command. If this prerequisite is not met, the system does not allow you to configure the graceful-restart peer-reset command.
Precautions
After you run the undo graceful-restart command to disable GR, the graceful-restart peer-reset command configuration will be deleted automatically.