Multicast Source Discovery Protocol (MSDP) | 679Prevent MSDP from Advertising a Local SourceIn Figure 31-14, R1 stops advertising source 10.11.4.2. Since it is already in the SA cache of R3, the entryremains there until it expires.Figure 31-14. Preventing MSDP from Advertising a Local SourceDisplay the configured SA filters for a peer using the command show ip msdp peer from EXEC Privilegemode (see Figure 31-14).Task Command Syntax Command ModePrevent an RP from advertising a source in the SAcache.ip msdp sa-filter list in peer list ext-acl CONFIGURATION[Router 1]R1_E600(conf)#do show run msdp!ip multicast-msdpip msdp peer 192.168.0.3 connect-source Loopback 0ip msdp sa-filter out 192.168.0.3 list mylocalfilterR1_E600(conf)#do show run acl!ip access-list extended mylocalfilterseq 5 deny ip host 239.0.0.1 host 10.11.4.2seq 10 deny ip any anyR1_E600(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 local 70 00:27:20R3_E600(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 00:10:29[Router 3]R3_E600(conf)#do show ip msdp sa-cacheR3_E600(conf)#
