HP MSR2003 Configuration Manual page 298

An IPv6 admin-scoped zone is designated to particular IPv6 multicast groups with the same scope field
value in their group addresses. Zone border routers (ZBRs) form the boundary of an IPv6 admin-scoped
zone. Each IPv6 admin-scoped zone maintains one BSR for IPv6 multicast groups with the same scope
field value. IPv6 multicast protocol packets, such as assert messages and BSMs, of these IPv6 multicast
groups cannot cross the boundary of the IPv6 admin-scoped zone for the group range. The IPv6 multicast
group ranges to which different IPv6 admin-scoped zones are designated can have intersections.
However, the IPv6 multicast groups in an IPv6 admin-scoped zone are valid only within its local zone,
and theses IPv6 multicast groups are regarded as private group addresses.
The IPv6 global-scoped zone can be regarded as a special IPv6 admin-scoped zone, and it maintains a
BSR for the IPv6 multicast groups with the scope field value as 14.
Relationship between IPv6 admin-scoped zones and the IPv6 global-scoped zone
The IPv6 global-scoped zone and each IPv6 admin-scoped zone have their own C-RPs and BSRs. These
devices are effective only on their respective zones, and the BSR election and the RP election are
implemented independently. Each IPv6 admin-scoped zone has its own boundary. The IPv6 multicast
information within a zone cannot cross this boundary in either direction. You can have a better
understanding of the IPv6 global-scoped zone and IPv6 admin-scoped zones based on geographical
locations and the scope field values.
In view of geographical locations
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An IPv6 admin-scoped zone is a logical zone for particular IPv6 multicast groups with the same
scope field value. The IPv6 multicast packets for such IPv6 multicast groups are confined within the
local IPv6 admin-scoped zone and cannot cross the boundary of the zone.
As shown in
admin-scoped zones must be geographically separated and isolated. The IPv6 global-scoped
zone includes all routers in the IPv6 PIM-SM domain or IPv6 BIDIR-PIM domain. IPv6 multicast
packets that do not belong to any IPv6 admin-scoped zones are forwarded in the entire IPv6
PIM-SM domain or IPv6 BIDIR-PIM domain.
In view of the scope field values
•
In terms of the scope field values, the scope field in an IPv6 multicast group address shows the
zone to which the IPv6 multicast group belongs.
Figure 93 Relationship in view of geographical locations
Figure 93, for the IPv6 multicast groups with the same scope field value, the IPv6
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