H3C Technologies H3C S10500 Series Switches - Manual (Page 181)

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Configuring administrative scoping
With administrative scoping disabled, a BIDIR-PIM domain has only one BSR. The BSR manages the
whole network. To manage your network more effectively and specifically, partition the BIDIR-PIM
domain into multiple admin-scope zones. Each admin-scope zone maintains a BSR, which serves a
specific multicast group range. The global scope zone also maintains a BSR, which serves all the rest
multicast groups.
Enabling administrative scoping
Before you configure an admin-scope zone, you must enable administrative scoping first.
Perform the following configuration on all routers in the BIDIR-PIM domain.
Follow these steps to enable administrative scoping:
To do… Use the command… Remarks
Enter system view system-view —
Enter public network PIM view or
VPN instance PIM view pim [ vpn-instance
vpn-instance-name ]
—
Enable administrative scoping c-bsr admin-scope
Required
Disabled by default
Configuring an admin-scope zone boundary
The boundary of each admin-scope zone is formed by ZBRs. Each admin-scope zone maintains a BSR,
which serves a specific multicast group range. Multicast protocol packets (such as assert messages and
bootstrap messages) that belong to this range cannot cross the admin-scope zone boundary.
Perform the following configuration on routers that you want to configure as a ZBR.
Follow these steps to configure an admin-scope zone boundary:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Configure a multicast forwarding
boundary
multicast boundary group-address
{ mask | mask-length }
Required
By default, no multicast forwarding
boundary is configured.
NOTE:
The group-address { mask | mask-length } part of the multicast boundary command can be used to
specify the multicast groups an admin-scope zone serves, in the range of 239.0.0.0/8. For more
information about the multicast boundary command, see IP Multicast Command Reference.
Configuring C-BSRs for each admin-scope zone and the global-scope 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 the specific BSR. The BSR summarizes the
advertisement messages to form an RP-set and advertises it to all routers in the specific admin-scope zone.
All the routers use the same hash algorithm to get the RP address corresponding to the specific multicast
group.