3Com Switch 8800 Advanced Software V5 Configuration Guide

584 CHAPTER 42: PIM CONFIGURATION
Configuring C-RP timers
To enable the BSR to distribute the RP-Set information within the PIM-SM domain,
C-RPs must periodically send C-RP-Adv messages to the BSR. The BSR learns the
RP-Set information from the received messages, and encapsulates its own IP
address together with the RP-Set information in its bootstrap messages. The BSR
then floods the bootstrap messages to all PIM devices (224.0.0.13) in the network.
Each C-RP encapsulates a timeout value in its C-RP-Adv message. Upon receiving
this message, the BSR obtains this timeout value and starts a C-RP timeout timer. If
the BSR fails to hear a subsequent C-RP-Adv message from the C-RP when the
timer times out, the BSR assumes the C-RP to have expired or become
unreachable.
Follow these steps to configure C-RP timers:
n
■ The commands introduced in this section are to be configured on C-RPs.
■ For the configuration of other timers in PIM-SM, see “Configuring PIM
Common Timers” on page 590.
Configuring PIM-SM
Register Messages
Within a PIM-SM domain, the source-side DR sends register messages to the RP,
and these register messages have different multicast source or group addresses.
You can configure a filtering rule to filter register messages so that the RP can
serve specific multicast groups. If an (S, G) entry is denied by the filtering rule, or
the action for this entry is not defined in the filtering rule, the RP will send a
register-stop message to the DR to stop the registration process for the multicast
data.
In view of information integrity of register messages in the transmission process,
you can configure the device to calculate the checksum based on the entire
register messages. However, to reduce the workload of encapsulating data in
register messages and for the sake of interoperability, this method of checksum
calculation is not recommended.
When receivers stop receiving multicast data addressed to a certain multicast
group through the RP (that is, the RP stops serving the receivers of a specific
To do... Use the command... Remarks
Enter system view system-view -
Enter PIM view pim -
Enable auto-RP auto-rp enable Optional
Disabled by default
To do... Use the command... Remarks
Enter system view system-view -
Enter PIM view pim -
Configure the C-RP-Adv
interval
c-rp advertisement-interval
interval
Optional
60 seconds by default
Configure C-RP timeout time c-rp holdtime interval Optional
150 seconds by default