3Com Switch 7754, Configuration Manual

Page: 475 / 940

Displaying and Debugging PIM 475
c
CAUTION:
■
If a source group entry (S, G) is denied in ACL, or no operation on the entry is
defined in the ACL, or ACLs are not defined, RP will send RegisterStop
messages to DR to stop the registration process of the multicast data flow.
■
Only the registration packets matching the permit command of ACLs can be
accepted When an invalid ACL is defined, RP will reject all the registration
packets.
Configuring the
Threshold for RPT-to-SPT
Switchover
Initially, a PIM-SM router forwards multicast packets through an RPT. However,
when the traffic rate of multicast packets reaches a configurable threshold, the
last-hop router that these multicast packets pass will initiate an RPT-to-SPT
switchover.
n
Only the threshold 0 and the infinity keyword are supported currently.
■
If the threshold is set to 0, the last-hop switch performs RPT-to-SPT switchover
upon receiving the first multicast packet.
■
The infinity keyword specifies that RPT-to-SPT switchover never takes place.
Displaying and
Debugging PIM
After completing the above configurations, you can execute the display
command in any view to verify the configuration by checking the displayed
information.
Quit VLAN view quit -
Enter PIM view pim -
Configure to filter the
registration packets from RP
to DR register-policy acl-number Required
■
You can configure to filter
the IP addresses of some
multicast groups in ACL.
■
By default, the switch does
not filter the registration
packets from DR.
Table 381 Filter the registration packets from RP to DR
Operation Command Description
Table 382 Set the threshold for RPT-to-SPT switchover
Operation Command Description
Enter system view system-view -
Enter PIM view pim Required
Set the threshold for
RPT-to-SPT switchover spt-switch-threshold { traffi
c-rate | infinity }
[ group-policy acl-number
[ order order-value ] ]
Optional
The threshold is 0 by default.