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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 43 Configuring MSDP
Configuring MSDP
Note An alternative to this command is the ip msdp sa-request global configuration command, which causes
the switch to send an SA request message to the MSDP peer when a new member for a group becomes
active. For more information, see the next section.
To return to the default setting (no SA state is created), use the no ip msdp cache-sa-state global
configuration command.
This example shows how to enable the cache state for all sources in 171.69.0.0/16 sending to
groups
224.2.0.0/16:
Switch(config)# ip msdp cache-sa-state 100
Switch(config)# access-list 100 permit ip 171.69.0.0 0.0.255.255 224.2.0.0 0.0.255.255
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.
Step 5
show running-config Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
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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