Controlling Source Information that Your Switch Receives By default, the device receives all SA messages that its MSDP RPF peers send to it. However, you can control the source information that you receive from MSDP peers by filtering incoming SA messages. In other words, you can configure the device to not accept them. You can perform one of these actions: • Filter all incoming SA messages from an MSDP peer • Specify an IP extended access list to pass certain source/group pairs Configuring MSDP Controlling Source Information that Your Switch Receives Command or Action Purpose Step 2 configure terminal Example: Device#configure terminal Enters global configuration mode.
Step 3 ip msdp ttl-threshold {ip-address | name} ttl Example: Device(config)#ip msdp ttl-threshold switch.cisco.com 0 Limits which multicast data is encapsulated in the first SA message to the specified MSDP peer. • For ip-address | name, enter the IP address or name of the MSDP peer to which the TTL limitation applies. • For ttl, enter the TTL value. The default is 0, which means all multicast data packets are forwarded to the peer until the TTL is exhausted. The range is 0 to 255. Step 4 end Example: Device(config)#end Returns to privileged EXEC mode. Step 5 show running-config Example: Device#show running-config Verifies your entries. Step 6 copy running-config startup-config Example:
Device#copy running-config startup-config (Optional) Saves your entries in the configuration file. Configuring MSDP 16