H3C Technologies H3C SecPath F1000-E - Manual (Page 187)

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if such devices exist in the IPv6 PIM-SM domain, you need to disable the semantic fragmentation function
on the C-BSRs.
Follow these steps to disable the BSM semantic fragmentation function:
To do… Use the command… Remarks
Enter system view system-view —
Enter IPv6 PIM view pim ipv6 —
Disable the BSM semantic
fragmentation function
undo bsm-fragment enable
Required
By default, the BSM semantic
fragmentation function is enabled.
NOTE:
Generally, a BSR performs BSM semantic fragmentation according to the MTU of its BSR interface.
However, the semantic fragmentation of BSMs originated due to learning of a new IPv6 PIM neighbor is
performed according to the MTU of the outgoing interface.
Configuring IPv6 Administrative Scoping
With IPv6 administrative scoping disabled, an IPv6 PIM-SM domain has only one BSR. The BSR
manages the whole network. To manage your network more effectively and specifically, you can
partition the IPv6 PIM-SM domain into multiple IPv6 admin-scope zones. Each IPv6 admin-scope zone
maintains a BSR, which serves a specific IPv6 multicast group range; while the IPv6 global scope zone
also maintains a BSR, which serves the IPv6 multicast groups with the Scope field in the group addresses
being 14.
Enabling IPv6 administrative scoping
Before configuring an IPv6 admin-scope zone, you must enable IPv6 administrative scoping first.
Perform the following configuration on routers that can become a C-BSR and ZBR.
Follow these steps to enable IPv6 administrative scoping:
To do… Use the command… Remarks
Enter system view system-view —
Enter IPv6 PIM view pim ipv6 —
Enable IPv6 administrative scoping c-bsr admin-scope
Required
Disabled by default
Configuring an IPv6 admin-scope zone boundary
The boundary of each IPv6 admin-scope zone is formed by ZBRs. Each admin-scope zone maintains a
BSR, which serves multicast groups with a specific Scope field in their group addresses. 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 can become a ZBR.
Follow these steps to configure an IPv6 admin-scope zone boundary: