672 | Multicast Source Discovery Protocol (MSDP)
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Enable MSDP
Enable MSDP by peering RPs in different administrative domains.
Figure 31-7. Configuring an MSDP Peer
Figure 31-8. Displaying Details about a Peer
Multicast sources in remote domains are stored on the RP in the Source-active cache (SA cache). The
system does not create entries in the multicast routing table until there is a local receiver for the
corresponding multicast group.
Manage the Source-active Cache
Each SA-originating RP caches the sources inside its domain (domain-local), and the sources which it has
learned from its peers (domain-remote). By caching sources:
• domain-local receivers experience a lower join latency,
Step Task Command Syntax Command Mode
1 Enable MSDP.
ip multicast-msdp
CONFIGURATION
2 PeerPIM systems in different
administrative domains.
ip msdp peer connect-source
CONFIGURATION
Task Command Syntax Command Mode
View details about about a peer.
show ip msdp peer
EXEC Privilege
R3_E600(conf)#ip multicast-msdp
R3_E600(conf)#ip msdp peer 192.168.0.1 connect-source Loopback 0
R3_E600(conf)#do show ip msdp summary
Peer Addr Local Addr State Source SA Up/Down
Description
R3_E600#show ip msdp peer
Peer Addr: 192.168.0.1
Local Addr: 192.168.0.3(639) Connect Source: Lo 0
State: Established Up/Down Time: 00:15:20
Timers: KeepAlive 30 sec, Hold time 75 sec
SourceActive packet count (in/out): 8/0
SAs learned from this peer: 1
SA Filtering:
Input (S,G) filter: none
Output (S,G) filter: none
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