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To implement refined management, an IPv6 PIM-SM/IPv6 BIDIR-PIM domain can be divided into one
IPv6 global scope zone and multiple IPv6 administratively scoped zones (IPv6 admin-scope zones). We
call this IPv6 administrative scoping mechanism.
The IPv6 administrative scoping mechanism effectively releases stress on the management in a
single-BSR domain and enables provision of zone-specific services using private group addresses.
IPv6 admin-scope zones correspond to IPv6 multicast groups with different scope values in their group
addresses. The boundary of the IPv6 admin-scope zone is formed by zone border routers (ZBRs). Each
IPv6 admin-scope zone maintains one BSR, which provides services for multicast groups within a specific
scope. IPv6 multicast protocol packets, such as assert messages and bootstrap messages, for a specific
group range cannot cross the IPv6 admin-scope zone boundary. IPv6 multicast group ranges to which
different IPv6 admin-scope zones are designated can overlap. An IPv6 multicast group is valid only
within its local IPv6 admin-scope zone, functioning as a private group address.
The IPv6 global scope zone maintains a BSR, which provides services for the IPv6 multicast groups with
the Scope field in their group addresses being 14.
Relationship between IPv6 admin-scope zones and the IPv6 global scope zone
The IPv6 global scope zone and each IPv6 admin-scope zone have their own C-RPs and BSRs. These
devices are effective only to 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
An IPv6 admin-scope zone is a logical zone for particular IPv6 multicast groups with the same
scope filed value. The IPv6 multicast packets for such IPv6 multicast groups are confined within the
local IPv6 admin-scope zone and cannot cross the boundary of the zone.
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