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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 serves 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 served by different IPv6

admin-scope zones 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 serves 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 in their respective IPv6 admin-scope zones. That is, BSR election and RP

election are implemented independently within each IPv6 admin-scope zone. Each IPv6 admin-scope

zone has its own boundary. The multicast information cannot cross this border in either direction. A

better understanding of the IPv6 global scope zone and IPv6 admin-scope zones should be based on

geographical space and group address range.

1. Geographical space

IPv6 admin-scope zones are logical zones specific to particular multicast groups. The multicast packets

of these multicast groups are confined within the local IPv6 admin-scope zone and cannot cross the

boundary of the zone.

Figure 95 Relationship between admin-scope zones and the global scope zone in geographic space

As shown in Figure 95, for multicast groups with the same Scope field in their group addresses, IPv6

admin-scope zones must be geographically separated from one another. Namely, a router must not

serve different admin-scope zones. In other words, different admin-scope zones contain different routers,

whereas the global scope zone covers all routers in the IPv6 PIM-SM/IPv6 BIDIR-PIM domain. Multicast

packets that do not belong to any admin-scope zones can be transmitted in the entire IPv6 PIM-SM/IPv6

BIDIR-PIM domain.

2. Multicast group address Scope field

As shown in Figure 96, the Sc

ope field in each IPv6 multicast group address indicates the admin-scope

zone the corresponding multicast group belongs to.

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