3Com Switch 8800 Family Configuration Guide

478 CHAPTER 45: MSDP CONFIGURATION
Configuring Originating
RP
During the creation of SA message, an MSDP peer can be configured to use the IP
address of a specified interface as the RP address in its SA message.
Please perform the following configurations in MSDP view.
By default, the RP address in SA message is the one configured by PIM.
Configuring SA Caching
State
When SA messages are cached on a router, the new join-in groups can directly
access all the active sources and join to the corresponding source tree, instead of
waiting for the arrival of the next SA message.
Please perform the following configurations in MSDP view.
By default, the router caches the SA state, or rather the (S, G) entry when receiving
an SA message.
Some memory is consumed as the join delay of groups is shortened by this
configuration.
Configuring the
Maximum Number of SA
caching
To prevent DoS (Deny of Service) attacks, you can set the maximum number of SAs
cached on the router.
Perform the following configuration in MSDP view.
By default, the maximum number of SA caching is 2048.
Requesting Source
Information of MSDP
Peers
When a new group joins, the router will send a SA request message to the
specified MSDP peer, and the MSDP peer will respond with the SA messages it
caches. If the MSDP peer does not enable the SA caching, the configuration is
invalid.
Tabl e 468 Configure Originating RP
Operation Command
Configure an MSDP peer to use the IP address
of a specified interface as the RP address of its
SA message
originating-rp interface-type
interface-number
Remove the above operation undo originating-rp
Tabl e 469 Configure SA caching state
Operation Command
Configure SA caching state cache-sa-enable
Disable SA caching state undo cache-sa-enable
Tabl e 470 Configure the maximum number of SA caching
Operation Command
Configuring the maximum number of SA
caching
peer peer-address sa-cache-maximum
sa-limit
Restore the default configuration
undo peer peer-address
sa-cache-maximum