Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 621)

Multi-Service IronWare Routing Configuration Guide 593
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Configuring BGP4+ graceful restart
BGP4+ Graceful Restart can be executed in both IPv4 and IPv6 address families. Depending on the
remote neighbor address family, the command and its parameters will be taken from the IPv4
family or IPv6 family.
When the graceful restart command is enabled, the BGP graceful restart capability is negotiated
with neighbors in the BGP OPEN message when the session is established. If the neighbor also
advertises support for graceful restart, then graceful restart is activated for that neighbor session.
If the neighbor does not advertise support for graceful restart, then graceful restart is not activated
for that neighbor session even though it is enabled locally. If the neighbor has not sent graceful
restart parameters, the restarting router will not wait for the neighbor to start route-calculation, but
graceful restart will be enabled.
Configuring BGP4+ graceful restart for the global routing instance
Use the following command to enable the BGP4+ graceful restart feature globally on a device.
Brocade(config)# router bgp
Brocade(config-bgp)# graceful-restart
Syntax: [no] graceful-restart
Configuring BGP4+ graceful restart on IPv4 VRF
Use the following command to enable the BGP4 restart feature for a specified VRF.
Brocade(config)# router bgp
Brocade(config-bgp)# address-family ipv4 unicast vrf blue
Brocade(config-bgp-ipv4u-vrf)# graceful-restart
Syntax: [no] graceful-restart
Configuring timers for BGP4+ graceful restart (optional)
You can optionally configure the following timers to change their values from the default values:
• Restart Timer
• Stale Routes Timer
• Purge Timer
Configuring the restart timer for BGP4+ graceful restart
Use the following command to specify the maximum amount of time a device will maintain routes
from and forward traffic to a restarting device.
Brocade(config-bgp)# graceful-restart restart-timer 150
Syntax: [no] graceful-restart restart-timer seconds
The seconds variable sets the maximum restart wait time advertised to neighbors. The allowable
range is 1 to 3600 seconds. The default value is 120 seconds.
Configuring BGP4+ graceful restart stale routes timer
Use the following command to specify the maximum amount of time a helper device will wait for an
end-of-RIB message from a peer before deleting routes from that peer.