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Multicast Source Discovery Protocol | 623
• RPs can transmit SA messages periodically to prevent SA storms, and
• only sources that are in the cache are advertised in the SA to prevent transmitting multiple copies of
the same source information.
View the Source-active Cache
Figure 28-9. Displaying the MSDP Source-active Cache
Limit the Source-active Cache
Set the upper limit of the number of active sources that FTOS 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 RPF and policy check.
If the total number of active sources is already larger than the limit when limiting is applied, the sources
that are already in FTOS are not discarded. To enforce the limit in such a situation, use the command
clear
ip msdp sa-cache
to clear all existing entries.
Clear the Source-active Cache
Enable the Rejected Source-active Cache
Active sources can be rejected because
• the RPF check failed,
• the SA limit is reached,
Task Command Syntax Command Mode
View the SA cache.
show ip msdp sa-cache
EXEC Privilege
Task Command Syntax Command Mode
Limit the number of sources that can be stored in the SA
cache.
show ip msdp sa-limit
EXEC Privilege
Task Command Syntax Command Mode
Clear the SA cache of all, local, or rejected entries, or
entries for a specific group.
clear ip msdp sa-cache
[group-address | local | rejected-sa]
CONFIGURATION
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