BigIron RX Series Configuration Guide 629
53-1002253-01
Configuring Multicast Source Discovery Protocol (MSDP)
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• Configure the MSDP peers
The PIM Sparse Rendezvous Point (RP) is also an MSDP peer.
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
You must save the configuration and reload the software to place the change into effect.
To enable MSDP, enter the following commands. 
BigIron RX(config)# router msdp
BigIron RX(config-msdp-router)# write memory
Syntax: [no] router msdp
Configuring MSDP peers
To configure an MSDP peer, enter a command such as the following at the MSDP configuration 
level.
BigIron RX(config-msdp-router)# msdp-peer 205.216.162.1
Syntax: [no]msdp-peer <ip-addr> [connect-source loopback <num>]
The <ip-addr> parameter specifies the IP address of the neighbor. 
The connect-source loopback <num> parameter specifies the loopback interface you want to use 
as the source for sessions with the neighbor. 
It is strongly recommended that you use the connect-source loopback <num> parameter when 
issuing the msdp-peer command. If you do not use this parameter, the BigIron RX uses the subnet 
interface configured on the port. Also, make sure the IP address of the connect-source loopback is 
the same as the source IP address used by the MSDP router, the PIM-RP, and the BGP router. 
The commands in the following example add an MSDP neighbor and specify a loopback interface 
as the source interface for sessions with the neighbor. By default, the BigIron RX uses the subnet 
address configured on the physical interface where you configure the neighbor as the source 
address for sessions with the neighbor. 
BigIron RX(config)# interface loopback 1
BigIron RX(config-lbif-1)# ip address 9.9.9.9/32
BigIron RX(config-lbif-1)# exit
BigIron RX(config)# router msdp
BigIron RX(config-msdp-router)# msdp-peer 2.2.2.99 connect-source loopback 1