Dell BigIron RX Series, Configuration Manual

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852 BigIron RX Series Configuration Guide
53-1002253-01
Displaying BGP4 information
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NOTE
After configuring BGP Graceful Restart, you need to reset neighbor session whether or not the
neighbor session is up to enable BGP graceful restart. Use the clear ip bgp neighbor command to
clear and re-establish neighbor sessions.
Configuring BGP graceful restart on a router
Use the following command to enable the BGP graceful restart feature on a BigIron RX device.
BigIron RX(config)#router bgp
BigIron RX(config-bgp)#graceful-restart
Configuring BGP graceful restart timer
Use the following command to specify the maximum amount of time a router will maintain routes
from a restarting router and forward traffic to a restarting router.
BigIron RX(config)#router bgp
BigIron RX(config-bgp)#graceful-restart
BigIron RX(config-bgp)#graceful-restart restart-time 60
Syntax: graceful-restart restart-time <seconds>
The <seconds> variable sets the maximum number of seconds the restarting router will take to
restart. Also, the peer routers waits this number of seconds to re-establish BGP connection and to
keep using the learned routes from the restarting router. Enter 10 – 3600 seconds. The default
value is 120 seconds.
Configuring BGP graceful restart stale routes timer
Use the following command to specify the maximum amount of time a helper router will wait for an
end-of-RIB message from a restarting router before deleting stale routes learned from that
restarting router.
BigIron RX(config-bgp)#graceful-restart stale-routes-time 30
Syntax: graceful-restart stale-routes-time <seconds>
The <seconds> variable sets the number of seconds that a helper router will wait for an end-of-RIB
(restart complete) message from a restarting router. Enter 10 – 3600 seconds. The default value is
360 seconds.
BGP graceful restart example
The following example configures three routers for BGP Graceful Restart. The default timer values
are accepted in this configuration.
Router 1
12.1.0.14
Router 2
12.2.0.14
Router 3
12.3.0.14
Restarting Router