Dell PowerConnect B-FCXs, Configuration Manual

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1090 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Updating route information and resetting a neighbor session
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This example shows the active configuration for a route map called “setcomm“.
Syntax: show route-map [ <map-name> ]
Displaying BGP4 graceful restart neighbor information
Use the show ip bgp neighbors command to display BGP4 restart information for BGP4 neighbors.
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.
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