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cannot cross this boundary in either direction. You can have a better understanding of the global-scoped
zone and admin-scoped zones based on geographical locations and multicast group address ranges.
• In view of geographical locations
An admin-scope zone is a logical zone for particular multicast groups. The multicast packets for
such multicast groups are confined within the local admin-scope zone and cannot cross the
boundary of the zone.
Figure 42 Relationship in view of geographical locations
As shown in Figure 42, for the multicast groups in a specific group address range, the
admin-scope zones must be geographically separated and isolated. A router cannot belong to
multiple admin-scope zones. In other words, different admin-scope zones contain different routers.
However, the global-scoped zone includes all routers in the PIM-SM domain. Multicast packets that
do not belong to any admin-scope zones are forwarded in the entire PIM-SM domain.
• In view of multicast group address ranges
Each admin-scope zone serves specific multicast groups, of which the multicast group addresses
are valid only within the local zone. The multicast groups of different admin-scoped zones might
have intersections. All the multicast groups other than those of the admin-scoped zones are served
by the global-scoped zone.
Figure 43 Relationship in view of multicast group address ranges
Admin-scope 3
G3 address
Admin-scope 2
G2 address
Admin-scope 1
G1 address
Global-scope
G
−G1−G2 address
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