Display And Debug Pim-Sm - 3Com 7700 Configuration Manual

136 C 6: M
HAPTER ULTICAST
Display and Debug
PIM-SM
P
ROTOCOL
multicast group in the specified range. It is suggested to configure Candidate RP
on the backbone router.
Configure RP to Filter the Register Messages Sent by DR
In the PIM-SM network, the register message filtering mechanism can control
which sources to send messages to which groups on the RP, i.e., RP can filter the
register messages sent by DR to accept specified messages only.
Perform the following configuration in PIM view.
Table 29 Configure RP to Filter the Register Messages Sent by DR
Operation
Configure RP to filter the
register messages sent by DR
Cancel the configured filter of
messages
If an entry of a source group is denied by the ACL, or the ACL does not define
operation to it, or there is no ACL defined, the RP will send RegisterStop messages
to the DR to prevent the register process of the multicast data stream.
CAUTION: Only the register messages matching the ACL permit clause can be
accepted by the RP. Specifying an undefined ACL will make the RP to deny all
register messages.
Set the Threshold of Switchover from the RPT to the SPT
The PIM-SM router uses the shared tree to forward multicast data packets initially.
If the rate of the multicast data exceeds the threshold, the last hop router will
initiate a switch from the shared tree to the shortest path tree.
Perform the following configuration in PIM view.
Table 30 Set the Threshold of Switchover from the RPT to the SPT
Operation
Set the threshold of
switchover from the RPT to the
SPT
Restore the default setting
By default, the threshold is 0. That is, the last hop router initiates the switch to the
shortest path tree upon the arrival of the first multicast data packet.
After the above configuration, execute display command in all views to display
PIM-SM configuration, and to verify the configuration.
Execute debugging command in user view for the debugging of PIM-SM.
Table 31 Display and Debug PIM-SM
Operation
Display the BSR information
Command
register-policy acl-number
undo register-policy
Command
spt-switch-threshold { traffic-rate | infinity } [ group-policy
acl-number ]
undo spt-switch-threshold { traffic-rate | infinity } [
group-policy acl-number ]
Command
display pim bsr-info