Cisco Systems 3560 사용자 설명서

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.

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

You can control the multicast source information that originates with your switch:

Sources you advertise (based on your sources)

Receivers of source information (based on knowing the requestor)

For more information, see the 

 and the 

.

Enter global configuration mode.

ip msdp sa-request {ip-address | name}

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.

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.