Brocade TurboIron 24X Series Configuration Guide - Manual (Page 867)

Brocade TurboIron 24X Series Configuration Guide 833
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Multicast Source Discovery Protocol (MSDP)
Some MSDP routers that are also RPs can cache Source Active messages. If the RP is not caching
Source Active messages, the RP does not send a Join message unless it already has a receiver that
wants to join the group. Otherwise, the RP does not send a Join message and does not remember
the information in the Source Active message after forwarding it. If the RP receives a request from
a receiver for the group, the RP and receiver must wait for the next Source Active message for that
group before the RP can send a Join message for the receiver.
However, if Source Active caching is enabled on the MSDP and RP router, the RP caches the Source
Active messages it receives. In this case, even if the RP does not have a receiver for a group when
the RP receives the Source Active message for the group, the RP can immediately send a Join for a
new receiver that wants to join the group, without waiting for the next Source Active message from
the RP in the source domain.
The maximum size of the cache used to store MSDP Source Active messages is 8K and the default
size is 4K.
Configuring MSDP
To configure MSDP on a Layer 3 Switch, perform the following tasks:
• Enable MSDP
• Configure the MSDP peers
NOTE
The PIM Sparse Rendezvous Point (RP) is also an MSDP peer.
NOTE
Routers that run MSDP must also run BGP. Also, the source address used by the MSDP router
must be the same source address used by BGP.
Enabling MSDP
To enable MSDP, enter the following command.
TurboIron(config)#router msdp
NOTE
When enabling and disabling MSDP, you do not need to save the configuration and reload the
software. The configuration change takes effect immediately, as soon as you enter the CLI
command.
Syntax: [no] router msdp
Configuring MSDP peers
On a device, you can configure a maximum of 15 MSDP peers. To configure an MSDP peer, enter a
command such as the following at the MSDP configuration level.
TurboIron(config-msdp-router)#msdp-peer 10.216.162.1
Syntax: [no] msdp-peer <ip-addr> [connect-source loopback <num>]
The <ip-addr> parameter specifies the IP address of the neighbor.