Multicast Source Discovery Protocol | 629
Prevent MSDP from Advertising a Local Source
In Figure 28-14, R1 stops advertising source 10.11.4.2. Since it is already in the SA cache of R3, the entry
remains there until it expires.
Figure 28-14. Preventing MSDP from Advertising a Local Source
Display the configured SA filters for a peer using the command show ip msdp peer from EXEC Privilege
mode (see Figure 28-14).
Task Command Syntax Command Mode
Prevent an RP from advertising a source in the SA
cache.
ip msdp sa-filter list in peer list ext-acl
CONFIGURATION
[Router 1]
R1_E600(conf)#do show run msdp
!
ip multicast-msdp
ip msdp peer 192.168.0.3 connect-source Loopback 0
ip msdp sa-filter out 192.168.0.3 list mylocalfilter
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
MSDP Source-Active Cache - 1 entries
GroupAddr SourceAddr RPAddr LearnedFrom Expire UpTime
239.0.0.1 10.11.4.2 192.168.0.1 local 70 00:27:20
R3_E600(conf)#do show ip msdp sa-cache
MSDP Source-Active Cache - 1 entries
GroupAddr SourceAddr RPAddr LearnedFrom Expire UpTime
239.0.0.1 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-cache
R3_E600(conf)#
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