Reference Guide

Multicast Source Discovery Protocol (MSDP) | 593
Figure 31-13. Preventing MSDP from Advertising a Local Source
Preventing MSDP from Advertising a Local Source
In Figure 31-14, 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.
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 3]
Dell(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
Dell(conf)#do show run acl
!
ip access-list extended myremotefilter
seq 5 deny ip host 239.0.0.1 host 10.11.4.2
Dell(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 00:03:59
Dell(conf)#do show ip msdp sa-cache
Dell(conf)#
Dell(conf)#do show ip msdp peer
Peer Addr: 192.168.0.1
Local Addr: 0.0.0.0(639) Connect Source: Lo 0
State: Listening Up/Down Time: 00:01:19
Timers: KeepAlive 30 sec, Hold time 75 sec
SourceActive packet count (in/out): 0/0
SAs learned from this peer: 0
SA Filtering:
Input (S,G) filter: myremotefilter
Output (S,G) filter: none