IPv6 administrative scoping

Typically, an IPv6 PIM-SM domain or an IPv6 BIDIR-PIM domain contains only one BSR, which is responsible for advertising RP-set information within the entire domain. Information about all IPv6 multicast groups is forwarded within the network that the BSR administers. This is called the "IPv6 non-scoped BSR mechanism."

IPv6 administrative scoping mechanism

To implement refined management, you can divide an IPv6 PIM-SM domain or IPv6 BIDIR-PIM domain into an IPv6 global-scoped zone and multiple IPv6 administratively-scoped zones (admin-scoped zones). This is called the "IPv6 administrative scoping mechanism."

The administrative scoping mechanism effectively releases stress on the management in a single-BSR domain and enables provision of zone-specific services through private group addresses.

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.