Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 225
Enable graceful restart, Command Syntax, Command Mode, Usage
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neighbor 100.10.92.9 local-as 6500 neighbor 100.10.92.9 no shutdown neighbor 192.168.10.1 remote-as 65123 neighbor 192.168.10.1 update-source Loopback 0 neighbor 192.168.10.1 no shutdown neighbor 192.168.12.2 remote-as 65123 neighbor 192.168.12.2 allowas-in 9 neighbor 192.168.12.2 update-source Loopback 0 neighbor 192.168.12.2 no shutdown R2(conf-router_bgp)#R2(conf-router_bgp)# Enable graceful restart Use this feature to lessen the negative effects of a BGP restart. FTOS advertises support for this feature to BGP neighbors through a capability advertisement. You can enable graceful restart by router and/or by peer or peer group. Note: By default, BGP graceful restart is disabled. The default role for BGP on is as a receiving or restarting peer. If you enable BGP, when a peer that supports graceful restart resumes operating, FTOS performs the following tasks: • Continues saving routes received from the peer if the peer advertised it had graceful restart capability. Continues forwarding traffic to the peer. • Flags routes from the peer as Stale and sets a timer to delete them if the peer does not perform a graceful restart. • Deletes all routes from the peer if forwarding state information is not saved. • Speeds convergence by advertising a special update packet known as an end-of-RIB marker. This marker indicates the peer has been updated with all routes in the local RIB. If you configure your system to do so, FTOS can perform the following actions during a hot failover: • Save all FIB and CAM entries on the line card and continue forwarding traffic while the secondary RPM is coming online. • Advertise to all BGP neighbors and peer-groups that the forwarding state of all routes has been saved. This prompts all peers to continue saving the routes they receive from your E-Series and to continue forwarding traffic. • Bring the secondary RPM online as the primary and re-open sessions with all peers operating in "no shutdown" mode. • Defer best path selection for a certain amount of time. This helps optimize path selection and results in fewer updates being sent out. Enable graceful restart using the configure router bgp graceful-restart command. The table below shows the command and its available options: Command Syntax bgp graceful-restart Command Mode Usage CONFIG-ROUTER-BGP Enable graceful restart for the BGP node. Border Gateway Protocol IPv4 (BGPv4) | 225
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