Controlling Source Information That Your Switch Forwards; Using A Filter - Cisco Catalyst 3750 Software Configuration Manual

Configuring MSDP

Controlling Source Information that Your Switch Forwards

By default, the switch forwards all SA messages it receives to all its MSDP peers. However, you can
prevent outgoing messages from being forwarded to a peer by using a filter or by setting a time-to-live
(TTL) value. These methods are described in the next sections.

Using a Filter

By creating a filter, you can perform one of these actions:
•
•
•
Beginning in privileged EXEC mode, follow these steps to apply a filter. This procedure is optional.
Command
Step 1
configure terminal
Step 2
ip msdp sa-filter out ip-address | name
or
ip msdp sa-filter out {ip-address | name}
list access-list-number
or
ip msdp sa-filter out {ip-address | name}
route-map map-tag
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Filter all source/group pairs
Specify an IP extended access list to pass only certain source/group pairs
Filter based on match criteria in a route map
Purpose
Enter global configuration mode.
Filter all SA messages to the specified MSDP peer.
or
To the specified peer, pass only those SA messages that pass the IP
extended access list. The range for the extended access-list-number
is 100 to 199.
If both the list and the route-map keywords are used, all conditions
must be true to pass any (S,G) pair in outgoing SA messages.
or
To the specified MSDP peer, pass only those SA messages that meet the
match criteria in the route map map-tag.
If all match criteria are true, a permit from the route map passes routes
through the filter. A deny filters routes.
Chapter 32 Configuring MSDP
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