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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 35 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 multilayer 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:
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:
• Sources you advertise (based on your sources)
• Receivers of source information (based on knowing the requestor)
For more information, see the “Redistributing Sources” section on page 35-9 and the “Filtering
Source-Active Request Messages” section on page 35-11.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
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.
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.
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