Multicast Source Discovery Protocol (MSDP) | 577
Prevent MSDP from Caching a Remote Source
In Figure 26-14, 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; it is not stored in the rejected SA
cache.
Figure 26-13. Preventing MSDP from Advertising a Local Source
Task Command Syntax Command Mode
OPTIONAL: Cache sources that are denied by the
SA filter in the rejected SA cache.
ip msdp cache-rejected-sa CONFIGURATION
Prevent the system from caching remote sources
learned from a specific peer based on source and
group.
ip msdp sa-filter list out peer list ext-acl CONFIGURATION
[Router 3]
R3_E600(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_E600(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_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 00:03:59
R3_E600(conf)#do show ip msdp sa-cache
R3_E600(conf)#
R3_E600(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
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