3Com Switch 7750 Configuration Guide

Displaying and Debugging MSDP Configuration 493
Configuring SA Message
Cache
With the SA message caching mechanism enabled on the router, the group that a
new member subsequently joins can obtain all active sources directly from the SA
cache and join the corresponding SPT source tree, instead of waiting for the next
SA message.
You can configure the number of SA entries cached in each MSDP peer on the
router by executing the following command, but the number must be within the
system limit. The maximum number of cached SA messages on each MSDP peer
and on all the MSDP peers on a router is limited by the system. To protect a router
against Deny of Service (DoS) attacks, you can manually configure the maximum
number of SA messages cached on the router. Generally, the configured number
of SA messages cached should be less than the system limit.
Displaying and
Debugging MSDP
Configuration
Displaying and debugging MSDP configuration
After the above-mentioned configuration, you can use the display command in
any view to display the MSDP running information, so as to verify configuration.
In user view, you can execute the reset command to reset the MSDP counter.
Configure to filter SA
messages to be received
or forwarded
peer peer-address
sa-policy { import | export }
[ acl acl-number ]
Optional
By default, no filtering is
imposed on SA messages to be
received or forwarded, namely
all SA messages from MSDP
peers are received or forwarded.
Configure the minimum
TTL for the multicast
packets sent to the
specified MSDP peer
peer peer-address
minimum-ttl ttl-value
Optional
By default, the value of TTL
threshold is 0.
Table 391 Configure a rule for filtering received and forwarded SA messages
Operation Command Description
Table 392 Configure SA message cache
Operation Command Description
Enter system view system-view -
Enter MSDP view msdp -
Enable SA message
caching mechanism
cache-sa-enable Optional
By default, the SA message
caching mechanism is enabled.
Configure the maximum
number of SA messages
cached
peer peer-address
sa-cache-maximum sa-limit
Optional
By default, the maximum
number of SA messages cached
on a router is 2,048.
Table 393 Display and debug MSDP configuration
Operation Command
Display the brief information of MSDP peer state display msdp brief
Display the detailed information of MSDP peer
status
display msdp peer-status
[ peer-address ]