Requesting Source Information from an MSDP Peer If you want a new member of a group to learn the active multicast sources in a connected PIM sparse-mode domain that are sending to a group, perform this task for the device to send SA request messages to the specified MSDP peer when a new member joins a group. The peer replies with the information in its SA cache. If the peer does not have a cache configured, this command has no result. Configuring this feature reduces join latency but sacrifices memory. Follow these steps to configure the device to send SA request messages to the MSDP peer when a new member joins a group and wants to receive multicast traffic:
Procedure Configuring MSDP Requesting Source Information from an MSDP Peer Command or Action Purpose Device#copy running-config startup-config Command or Action Purpose Step 1 enable Example: Device>enable Enables privileged EXEC mode. • Enter your password if prompted. Step 2 configure terminal Example: Device#configure terminal Enters global configuration mode. Step 3 ip msdp sa-request {ip-address | name} Example: Device(config)#ip msdp sa-request 171.69.1.1 Configure the device to send SA request messages to the specified MSDP peer.
For ip-address | name, enter the IP address or name of the MSDP peer from which the local device requests SA messages when a new member for a group becomes active. Repeat the command for each MSDP peer that you want to supply with SA messages. Step 4 end Example: Device(config)#end Returns to privileged EXEC mode. Configuring MSDP 8