Configuring Parameters For A Bgp Gr Session - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
BGP GR is enabled.
By default, BGP GR is disabled.
Step 4 (Optional) Run:
graceful-restart peer-reset
The router is enabled to reset a BGP session in GR mode.
Currently, BGP does not support dynamic capability negotiation. Therefore, each time a new
BGP capability is enabled on a router, the BGP speaker tears down existing sessions with its
peer and renegotiates BGP capabilities. This process will interrupt ongoing services. To prevent
the service interruptions, run the graceful-restart peer-reset command to enable the router to
reset a BGP session in GR mode. Then, the router will not delete routing entries for existing
sessions when a new BGP capability is enabled.
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8.22.3 Configuring Parameters for a BGP GR Session

BGP GR session parameter values can be adjusted as needed, but default values are
recommended. Changing the BGP restart period reestablishes BGP peer relationships.
Context
GR time is the period of time during which the GR helper retains the forwarding information
after having found the GR restarter Down. If the GR helper finds that the GR restarter goes
Down, the GR helper keeps the topology information or routes learned from the GR restarter
till the GR time expires.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
Step 3 Run:
graceful-restart timer restart time
The maximum period of time used for reestablishing a BGP session is set.
The restart period of the router is the maximum waiting period from the time when the GR helper
discovers that the GR restarter restarts to the time when the BGP session is reestablished. By
default, the restart period is 150 seconds.
Step 4 Run:
graceful-restart timer wait-for-rib time
Issue 02 (2014-09-30)
NOTE
Changing the BGP restart period reestablishes BGP peer relationships.
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