Brocade TurboIron 24X Series Configuration Guide - Manual (Page 798)

764 Brocade TurboIron 24X Series Configuration Guide
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Updating route information and resetting a neighbor session
Closing or resetting a neighbor session
You can close a neighbor session or resend route updates to a neighbor.
If you make changes to filters or route maps and the neighbor does not support dynamic route
refresh, use the following methods to ensure that neighbors contain only the routes you want them
to contain:
• If you close a neighbor session, the Layer 3 Switch and the neighbor clear all the routes they
learned from each other. When the Layer 3 Switch and neighbor establish a new BGP4
session, they exchange route tables again. Use this method if you want the Layer 3 Switch to
relearn routes from the neighbor and resend its own route table to the neighbor.
• If you use the soft-outbound option, the Layer 3 Switch compiles a list of all the routes it would
normally send to the neighbor at the beginning of a session. However, before sending the
updates, the Layer 3 Switch also applies the filters and route maps you have configured to the
list of routes. If the filters or route maps result in changes to the list of routes, the Layer 3
Switch sends updates to advertise, change, or even withdraw routes on the neighbor as
needed. This ensures that the neighbor receives only the routes you want it to contain. Even if
the neighbor already contains a route learned from the Layer 3 Switch that you later decided to
filter out, using the soft-outbound option removes that route from the neighbor.
You can specify a single neighbor or a peer group.
To close a neighbor session and thus flush all the routes exchanged by the Layer 3 Switch and the
neighbor, enter the following command.
TurboIron#clear ip bgp neighbor all
Syntax: clear ip bgp neighbor all | <ip-addr> | <peer-group-name> | <as-num> [soft-outbound |
soft [in | out]]
The all | <ip-addr> | <peer-group-name> | <as-num> specifies the neighbor. The <ip-addr>
parameter specifies a neighbor by its IP interface with the Layer 3 Switch. The <peer-group-name>
specifies all neighbors in a specific peer group. The <as-num> parameter specifies all neighbors
within the specified AS. The all parameter specifies all neighbors.
To resend routes to a neighbor without closing the neighbor session, enter a command such as the
following.
TurboIron#clear ip bgp neighbor 10.0.0.1 soft out
Clearing and resetting BGP4 routes in the IP route table
To clear BGP4 routes from the IP route table and reset the routes, enter a command such as the
following.
TurboIron#clear ip bgp routes
Syntax: clear ip bgp routes [<ip-addr>/<prefix-length>]
NOTE
The clear ip bgp routes command has the same effect as the clear ip route command, but applies
only to routes that come from BGP4.