Dell PowerConnect FCS624S Configuration Guide - Page 1132

30 Updating route information and resetting a neighbor session This example shows the active configuration for a route map called "setcomm". Syntax: show route-map [] Displaying BGP4 graceful restart neighbor information Use the show ip bgp neighbors command to display BGP4 restart information for BGP4 neighbors. PowerConnect# show ip bgp neighbors Total number of BGP Neighbors: 6 1 IP Address: 50.50.50.10, AS: 20 (EBGP), RouterID: 10.10.10.20 State: ESTABLISHED, Time: 0h0m18s, KeepAliveTime: 60, HoldTime: 180 KeepAliveTimer Expire in 34 seconds, HoldTimer Expire in 163 seconds Minimum Route Advertisement Interval: 0 seconds RefreshCapability: Received GracefulRestartCapability: Received Restart Time 120 sec, Restart bit 0 afi/safi 1/1, Forwarding bit 0 GracefulRestartCapability: Sent Restart Time 120 sec, Restart bit 0 afi/safi 1/1, Forwarding bit 1 Messages: Open Update KeepAlive Notification Refresh-Req The text in bold is the BGP4 restart information for the specified neighbor. Syntax: show ip bgp neighbors Updating route information and resetting a neighbor session The following sections describe ways to update route information with a neighbor, reset the session with a neighbor, and close a session with a neighbor. Whenever you change a policy (ACL, route map, and so on) that affects the routes that the Layer 3 Switch learns from a BGP4 neighbor or peer group of neighbors, you must enter a command to place the changes into effect. The changes take place automatically, but only affect new route updates. To make changes retroactive for routes received or sent before the changes were made, you need to enter a clear command. You can update the learned routes using either of the following methods: • Request the complete BGP4 route table from the neighbor or peer group. You can use this method if the neighbor supports the refresh capability (RFCs 2842 and 2858). • Clear (reset) the session with the neighbor or peer group. This is the only method you can use if the neighbor does not support the refresh capability. Each of these methods is effective, but can be disruptive to the network. The first method adds overhead while the Layer 3 Switch learns and filters the neighbor or group entire route table, while the second method adds more overhead while the devices re-establish their BGP4 sessions. You also can clear and reset the BGP4 routes that have been installed in the IP route table. Refer to "Clearing and resetting BGP4 routes in the IP route table" on page 1097. 1090 PowerConnect B-Series FCX Configuration Guide 53-1002266-01