Cisco IE 4000, Software Configuration Manual

Page: 742 / 1066

738
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.
Follow this procedure 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.
DETAILED STEPS
To return to the default setting, use the no ip msdp sa-request { ip-address | name } global configuration command.
EXAMPLE
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 Redistributing Sources, page 738 and Filtering Source-Active Request Messages, page 740 .
Redistributing Sources
SA messages originate on RPs to which sources have registered. By default, any source that registers with an RP is
advertised. The
A flag is set in the RP when a source is registered, which means the source is advertised in an SA unless
it is filtered. Follow this procedure to further restrict which registered sources are advertised. This procedure is optional.
Table 0- 3
Command Purpose
1. configure terminal Enter global configuration mode.
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.
3. end Return to privileged EXEC mode.
4. show running-config Verify your entries.
5. copy running-config
startup-config (Optional) Save your entries in the configuration file.