3Com Switch 8800 Advanced Software V5 Configuration Guide

582 CHAPTER 42: PIM CONFIGURATION
Configuring global C-BSR parameters
The BSR election winner advertises its own IP address and RP-Set information
throughout the region it serves through bootstrap messages. The BSR floods
bootstrap messages throughout the network periodically. Any C-BSR that receives
a bootstrap message maintains the BSR state for a configurable period of time
(BSR state timeout), during which no BSR election takes place. When the BSR state
times out, a new BSR election process will be triggered among the C-BSRs.
Follow these steps to global C-BSR parameters:
c
CAUTION: In configuration, make sure that the bootstrap interval is smaller than
the bootstrap timeout time.
Configuring an RP An RP can be manually configured or dynamically elected through the BSR
mechanism. For a large PIM network, static RP configuration is a tedious job.
Generally, static RP configuration is just a backup means for the dynamic RP
election mechanism to enhance the robustness and operation manageability of a
multicast network.
Configuring a static RP
If there is only one dynamic RP in a network, manually configuring a static RP can
avoid communication interruption due to single-point failures and avoid frequent
message exchange between C-RPs and the BSR. To enable a static RP to work
normally, you must perform this configuration on all the devices in the PIM-SM
domain and specify the same RP address.
Follow these steps to configure a static RP:
Enter VLAN/POS interface
view
interface interface-type
interface-number
-
Configure a BSR admin-scope
region boundary
pim bsr-boundary Required
No BSR admin-scope region
boundary by default
To do... Use the command... Remarks
Enter system view system-view -
Enter PIM view pim -
Configure the Hash mask
length for RP selection
calculation
c-bsr hash-length
hash-length
Optional
30 by default
Configure the C-BSR priority c-bsr priority priority Optional
0 by default
Configure the bootstrap
interval
c-bsr interval interval Optional
60 seconds by default
Configure the bootstrap
timeout time
c-bsr holdtime interval Optional
130 seconds by default
To do... Use the command... Remarks