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H3C Technologies H3C S12500-X Series Switches User Manual

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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
An IPv6 admin-scoped 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-scoped zone and cannot cross the boundary of the zone.

Figure 50 Relationship in view of geographical locations

As shown in

Figure 50

, for the IPv6 multicast groups with the same scope field value, the IPv6

admin-scoped zones must be geographically separated and isolated. The IPv6 global-scoped
zone includes all routers in the IPv6 PIM-SM domain. IPv6 multicast packets that do not belong to

any IPv6 admin-scoped zones are forwarded in the entire IPv6 PIM-SM 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 to which
zone the IPv6 multicast group belongs.

Figure 51 IPv6 multicast address format

An IPv6 admin-scoped zone with a larger scope field value contains an IPv6 admin-scoped zone
with a smaller scope field value. The zone with the scope field value of E is the IPv6 global-scoped

zone.

Table 5

lists the possible values of the scope field.