Dell BigIron RX Series, Configuration Manual

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810 BigIron RX Series Configuration Guide
53-1002253-01
Filtering
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Syntax: [no] neighbor <ip-addr> | <peer-group-name> capability orf prefixlist [send | receive]
The <ip-addr> | <peer-group-name> parameter specifies the IP address of a neighbor or the name
of a peer group of neighbors.
The send | receive parameter specifies the support you are enabling:
•
send – The device sends the IP prefix lists to the neighbor.
•
receive – The device accepts filters from the neighbor.
If you do not specify the capability, both capabilities are enabled.
The prefixlist parameter specifies the type of filter you want to send to the neighbor.
NOTE
The current release supports cooperative filtering only for filters configured using IP prefix lists.
Sending and receiving ORFs
Cooperative filtering affects neighbor sessions that start after the filtering is enabled, but do not
affect sessions that are already established.
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 device 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.
BigIron RX# 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 device, the device 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.
BigIron RX# 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 device sends the updated IP prefix list to the
neighbor as part of its route refresh message to the neighbor.
NOTE
If the device 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: