R3(conf)#do show ip msdp summaryPeer Addr Local Addr State Source SA Up/DownDescriptionTo 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 inthe multicast routing table until there is a local receiver for the corresponding multicast group.R3#show ip msdp peerPeer Addr: 192.168.0.1Local Addr: 192.168.0.3(639) Connect Source: Lo 0State: Established Up/Down Time: 00:15:20Timers: KeepAlive 30 sec, Hold time 75 secSourceActive packet count (in/out): 8/0SAs learned from this peer: 1SA Filtering:Input (S,G) filter: noneOutput (S,G) filter: noneManage the Source-Active CacheEach 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 informationViewing the Source-Active CacheTo view the source-active cache, use the following command.• View the SA cache.EXEC Privilege modeshow ip msdp sa-cacheExample of the show ip msdp sa-cache CommandR3#show ip msdp sa-cacheMSDP Source-Active Cache - 1 entriesGroupAddr SourceAddr RPAddr LearnedFrom Expire UpTime239.0.0.1 10.11.4.2 192.168.0.1 192.168.0.1 76 00:10:44Limiting the Source-Active CacheSet the upper limit of the number of active sources that the Dell Networking OS caches.The default active source limit is 500K messages. When the total number of active sources reaches the specified limit, subsequent activesources are dropped even if they pass the reverse path forwarding (RPF) and policy check.To limit the number of sources that SA cache stores, use the following command.• Limit the number of sources that can be stored in the SA cache.EXEC Privilege modeMulticast Source Discovery Protocol (MSDP) 541
