Configuring BGP4
December 2005 © Foundry Networks, Inc. 21 - 57
To activate cooperative filtering, reset the session with the neighbor. This is required because the cooperative
filtering information is exchanged in Open messages during the start of a session.
To place a prefix-list change into effect after activating cooperative filtering, perform a soft reset of the neighbor
session. A soft reset does not end the current session, but sends the prefix list to the neighbor in the next route
refresh message.
NOTE: Make sure cooperative filtering is enabled on the Layer 3 Switch and on the neighbor before you send the
filters.
To reset a neighbor session and send ORFs to the neighbor, enter a command such as the following:
FESX424 Router# clear ip bgp neighbor 1.2.3.4
This command resets the BGP4 session with neighbor 1.2.3.4 and sends the ORFs to the neighbor. If the
neighbor sends ORFs to the Layer 3 Switch, the Layer 3 Switch accepts them if the send capability is enabled.
To perform a soft reset of a neighbor session and send ORFs to the neighbor, enter a command such as the
following:
FESX424 Router# clear ip bgp neighbor 1.2.3.4 soft in prefix-list
Syntax: clear ip bgp neighbor <ip-addr> [soft in prefix-filter]
If you use the soft in prefix-filter parameter, the Layer 3 Switch sends the updated IP prefix list to the neighbor as
part of its route refresh message to the neighbor.
NOTE: If the Layer 3 Switch or the neighbor is not configured for cooperative filtering, the command sends a
normal route refresh message.
Displaying Cooperative Filtering Information
You can display the following cooperative filtering information:
• The cooperative filtering configuration on the Layer 3 Switch.
• The ORFs received from neighbors.
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