Manage The Source-Active Cache; Viewing The Source-Active Cache - Dell S4820T Configuration Manual

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Examples of Configuring and Viewing MSDP

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

To view details about a peer, use the show ip msdp peer command in EXEC privilege mode.

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.

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

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

RPs can transmit SA messages periodically to prevent SA storms

only sources that are in the cache are advertised in the SA to prevent transmitting multiple copies of

the same source information

To view the source-active cache, use the following command.

View the SA cache.

EXEC Privilege mode

show ip msdp sa-cache

Example of the show ip msdp sa-cache Command

R3_E600#show ip msdp sa-cache

MSDP Source-Active Cache - 1 entries

Expire UpTime

Multicast Source Discovery Protocol (MSDP)