3Com 8807 Configuration Manual page 478

478 C 45: MSDP C
HAPTER
Configuring Originating
Configuring SA Caching
State
Configuring the
Maximum Number of SA
caching
Requesting Source
Information of MSDP
Peers
ONFIGURATION
During the creation of SA message, an MSDP peer can be configured to use the IP
RP address of a specified interface as the RP address in its SA message.
Please perform the following configurations in MSDP view.
Table 468 Configure Originating RP
Operation
Configure an MSDP peer to use the IP address
of a specified interface as the RP address of its
SA message
Remove the above operation
By default, the RP address in SA message is the one configured by PIM.
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.
Table 469 Configure SA caching state
Operation
Configure SA caching state
Disable SA caching state
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.
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.
Table 470 Configure the maximum number of SA caching
Operation
Configuring the maximum number of SA
caching
Restore the default configuration
By default, the maximum number of SA caching is 2048.
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.
Command
originating-rp interface-type
interface-number
undo originating-rp
Command
cache-sa-enable
undo cache-sa-enable
Command
peer peer-address sa-cache-maximum
sa-limit
undo peer peer-address
sa-cache-maximum