H3C Technologies H3C S12500 Series Switches - Manual (Page 152)

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specific multicast group range. The global-scoped zone also maintains a BSR to provide services for all
the remaining multicast groups.
Enabling administrative scoping
Before you configure an admin-scoped zone, you must enable administrative scoping first.
Perform the following configuration on routers that you want to configure as a C-BSR and ZBR.
To enable administrative scoping:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter public network PIM view
or VPN instance PIM view. pim [ vpn-instance
vpn-instance-name ]
N/A
3. Enable administrative
scoping.
c-bsr admin-scope Disabled by default.
Configuring an admin-scoped zone boundary
The boundary of each admin-scoped zone is formed by ZBRs. Each admin-scoped zone maintains a BSR
to provide services for a specific multicast group range. Multicast protocol packets (such as assert
messages and bootstrap messages) that belong to this range cannot cross the admin-scoped zone
boundary.
Perform the following configuration on routers that you want to configure as a ZBR.
To configure an admin-scoped zone boundary:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure a multicast
forwarding boundary. multicast boundary group-address
{ mask | mask-length }
By default, no multicast forwarding
boundary is configured.
The group-address { mask |
mask-length } argument of the
multicast boundary command can
be used to specify the multicast
groups to which an admin-scoped
zone is designated, in the range of
239.0.0.0/8.
Configuring C-BSRs for each admin-scoped zone and the global-scoped zone
In a network with administrative scoping enabled, group-range-specific BSRs are elected from C-BSRs.
C-RPs in the network send advertisement messages to a specific BSR. The BSR summarizes the
advertisement messages to form an RP-set and advertises it to all routers in a specific admin-scoped zone.
All the routers use the same hash algorithm to get the RP address corresponding to a specific multicast
group.
You can configure the hash mask length and C-BSR priority globally, in an admin-scoped zone, and in
the global-scoped zone.