R1_E600(conf)#do show ip msdp sa-cacheR1_E600(conf)#do show ip msdp sa-cache rejected-saMSDP Rejected SA Cache1 rejected SAs received, cache-size 1000UpTime GroupAddr SourceAddr RPAddr LearnedFrom Reason00:02:20 239.0.0.1 10.11.4.2 192.168.0.1 local RedistributePreventing MSDP from Caching a Remote SourceTo prevent MSDP from caching a remote source, use the following commands.1 OPTIONAL: Cache sources that the SA filter denies in the rejected SA cache.CONFIGURATION modeip msdp cache-rejected-sa2 Prevent the system from caching remote sources learned from a specific peer based on source and group.CONFIGURATION modeip msdp sa-filter list out peer list ext-aclExample of Verifying the System is not Caching Remote SourcesAs shown in the following example, R1 is advertising source 10.11.4.2. It is already in the SA cache of R3 when an ingress SA filter is appliedto R3. The entry remains in the SA cache until it expires and is not stored in the rejected SA cache.[Router 3]R3(conf)#do show run msdp!ip multicast-msdpip msdp peer 192.168.0.1 connect-source Loopback 0ip msdp sa-filter in 192.168.0.1 list myremotefilterR3(conf)#do show run acl!ip access-list extended myremotefilterseq 5 deny ip host 239.0.0.1 host 10.11.4.2R3(conf)#do 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 1 00:03:59R3(conf)#do show ip msdp sa-cacheR3(conf)#R3(conf)#do show ip msdp peerPeer Addr: 192.168.0.1Local Addr: 0.0.0.0(639) Connect Source: Lo 0State: Listening Up/Down Time: 00:01:19Timers: KeepAlive 30 sec, Hold time 75 secSourceActive packet count (in/out): 0/0SAs learned from this peer: 0SA Filtering:Input (S,G) filter: myremotefilterOutput (S,G) filter: nonePreventing MSDP from Advertising a Local SourceTo prevent MSDP from advertising a local source, use the following command.• Prevent an RP from advertising a source in the SA cache.CONFIGURATION modeip msdp sa-filter list in peer list ext-acl568 Multicast Source Discovery Protocol (MSDP)
