Example of the show ip msdp sa-cache Command
R3_E600#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 76 00:10:44

Limiting the Source-Active Cache

Set the upper limit of the number of active sources that the Dell Networking operating system caches.
The default active source limit is 500K messages. When the total number of active sources reaches the
specified limit, subsequent active sources are dropped even if they pass the reverse path forwarding (RPF)
and policy check.
To limit the number of sources that SA cache stores, use the following command.
• Limit the number of sources that can be stored in the SA cache.
EXEC Privilege mode
show ip msdp sa-limit
If the total number of active sources is already larger than the limit when limiting is applied, the sources
that are already in the system are not discarded. To enforce the limit in such a situation, use the clear
ip msdp sa-cache command to clear all existing entries.

Clearing the Source-Active Cache

To clear the source-active cache, use the following command.
• Clear the SA cache of all, local, or rejected entries, or entries for a specific group.
CONFIGURATION mode
clear ip msdp sa-cache [group-address | local | rejected-sa]

Enabling the Rejected Source-Active Cache

To cache rejected sources, use the following command.
Active sources can be rejected because the RPF check failed, the SA limit is reached, the peer RP is
unreachable, or the SA message has a format error.
• Cache rejected sources.
CONFIGURATION mode
ip msdp cache-rejected-sa
Accept Source-Active Messages that Fail the RFP Check
A default peer is a peer from which active sources are accepted even though they fail the RFP check.
Referring to the following illustrations:
Multicast Source Discovery Protocol (MSDP) 569