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49-12

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

OL-21521-01

Chapter 49 Configuring MSDP

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:

• 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

Beginning in privileged EXEC mode, follow these steps to apply a filter. This procedure is optional.

Command Purpose

Step 1

configure terminal Enter global configuration mode.

Step 2

ip msdp sa-filter out ip-address | name

ip msdp sa-filter out {ip

-address | name}

list access-list-number

ip msdp sa-filter out {ip

-address | name}

route-map map-tag

Filter all SA messages to the specified MSDP peer.

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.

To the specified MSDP peer, pass only those SA messa

ges 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.

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