Cisco Systems 3750E manual Requesting Source Information from an Msdp Peer, 43-8

Chapter 43 Configuring MSDP

Configuring MSDP

Requesting Source Information from an MSDP Peer

Local RPs can send SA requests and get immediate responses for all active sources for a given group. By default, the switch does not send any SA request messages to its MSDP peers when a new member joins a group and wants to receive multicast traffic. The new member waits to receive the next periodic SA message.

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, configure the switch 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.

Beginning in privileged EXEC mode, follow these steps to configure the switch to send SA request messages to the MSDP peer when a new member joins a group and wants to receive multicast traffic. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	ip msdp sa-request {ip-addressname}	Configure the switch 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 switch 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 3
	end	Return to privileged EXEC mode.
Step 4
	show running-config	Verify your entries.
Step 5
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To return to the default setting, use the no ip msdp sa-request{ip-address name} global configuration command.

This example shows how to configure the switch to send SA request messages to the MSDP peer at 171.69.1.1:

Switch(config)# ip msdp sa-request 171.69.1.1

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

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