3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring PIM-SM 581
Configuring an admin-scope C-BSR
By default, a PIM-SM domain has only one BSR. The entire network should be
managed by this one BSR. To manage your network more effectively and specially,
you can divide a PIM-SM domain into multiple BSR admin-scope regions, with
each BSR admin-scope region having one BSR, which services specific multicast
groups.
Specific to particular multicast groups, the BSR administrative scoping mechanism
effectively lessens the management workload of a single-BSR domain and provides
group-specific services.
In a network divided into BSR admin-scope regions, BSRs are elected from
multitudinous C-BSRs to service different multicast groups. The C-RPs in a BSR
admin-scope region send C-RP-Adv messages to only the corresponding BSR. The
BSR summarizes the advertisement messages into an RP-set and advertises it to all
the devices in the BSR admin-scope region. All the devices use the same algorithm
to get the RP addresses corresponding to specific multicast groups.
Follow these steps to configure an admin-scope C-BSR:
n
A BSR admin-scope region is effective only for the multicast groups whose
addresses fall in the range of 239.0.0.0 to 239.255.255.255.
Configuring a BSR admin-scope region boundary
A BSR has its specific service scope. A number of BSR boundary interfaces divide a
network into different BSR admin-scope regions. Bootstrap messages cannot cross
the admin-scope region boundary, while other types of PIM messages can.
Follow these steps to configure a BSR admin-scope region boundary:
To do... Use the command... Remarks
Enter system view system-view -
Enter PIM view pim -
Configure a global-scope
C-BSR
c-bsr global [ hash-length
hash-length | priority priority
] *
Required
No global-scope C-BSRs by
default
To do... Use the command... Remarks
Enter system view system-view -
Enter PIM view pim -
Enable BSR administrative
scoping
c-bsr admin-scope Required
Disabled by default
Configure an admin-scope
C-BSR
c-bsr group group-address {
mask | mask-length } [
hash-length hash-length |
priority priority ] *
Optional
No admin-scope BSRs by
default
To do... Use the command... Remarks
Enter system view system-view -