Requesting Source Information From An Msdp Peer; Controlling Source Information That Your Switch Originates - Cisco Catalyst 3750 Software Configuration Manual

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
Step 1 configure terminal
Step 2
ip msdp sa-request {ip-address | name}
Step 3
end
Step 4
show running-config
Step 5 copy running-config startup-config
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

Controlling Source Information that Your Switch Originates

You can control the multicast source information that originates with your switch:
•
•
For more information, see the
Source-Active Request Messages" section on page
Catalyst 3750 Metro Switch Software Configuration Guide
32-8
Sources you advertise (based on your sources)
Receivers of source information (based on knowing the requestor)
Purpose
Enter global configuration mode.
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.
"Redistributing Sources" section on page 32-9
32-11.
Chapter 32 Configuring MSDP
and the "Filtering
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