Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 576
Preventing MSDP from Caching a Remote Source
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CONFIGURATION mode ip msdp cache-rejected-sa 2 Prevent the system from caching local SA entries based on source and group using an extended ACL. CONFIGURATION mode ip msdp redistribute list Example of Verifying the System is not Caching Local Sources When you apply this filter, the SA cache is not affected immediately. When sources that are denied by the ACL time out, they are not refreshed. Until they time out, they continue to reside in the cache. To apply the redistribute filter to entries already present in the SA cache, first clear the SA cache. You may optionally store denied sources in the rejected SA cache. R1(conf)#do show run msdp ! ip multicast-msdp ip msdp peer 192.168.0.3 connect-source Loopback 0 ip msdp redistribute list mylocalfilter ip msdp cache-rejected-sa 1000 R1_E600(conf)#do show run acl ! ip access-list extended mylocalfilter seq 5 deny ip host 239.0.0.1 host 10.11.4.2 seq 10 deny ip any any R1_E600(conf)#do show ip msdp sa-cache R1_E600(conf)#do show ip msdp sa-cache rejected-sa MSDP Rejected SA Cache 1 rejected SAs received, cache-size 1000 UpTime GroupAddr SourceAddr RPAddr LearnedFrom 00:02:20 239.0.0.1 10.11.4.2 192.168.0.1 local Reason Redistribute Preventing MSDP from Caching a Remote Source To 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 mode ip msdp cache-rejected-sa 2 Prevent the system from caching remote sources learned from a specific peer based on source and group. CONFIGURATION mode ip msdp sa-filter list out peer list ext-acl Example of Verifying the System is not Caching Remote Sources As 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 applied to 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-msdp ip msdp peer 192.168.0.1 connect-source Loopback 0 ip msdp sa-filter in 192.168.0.1 list myremotefilter R3(conf)#do show run acl ! ip access-list extended myremotefilter seq 5 deny ip host 239.0.0.1 host 10.11.4.2 R3(conf)#do show ip msdp sa-cache MSDP Source-Active Cache - 1 entries GroupAddr SourceAddr RPAddr LearnedFrom Expire 239.0.0.1 10.11.4.2 192.168.0.1 192.168.0.1 1 R3(conf)#do show ip msdp sa-cache UpTime 00:03:59 Multicast Source Discovery Protocol (MSDP) 576
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