Protocols And Standards - HP 5920 series Configuration Manual

Figure 30 Relationship in view of geographical locations
As shown in
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 31 Relationship in view of multicast group address ranges
Admin-scope 1
G1 address
Global-scope
−
G G1
As shown in
admin-scoped zone 3 is a subset of the admin-scoped zone 1. The global-scoped zone serves all
the multicast groups that are not covered by the admin-scoped zones 1 and 2, G−G1−G2 in this
case.

Protocols and standards

RFC 3973, Protocol Independent Multicast-Dense Mode (PIM-DM): Protocol Specification(Revised)
•
Figure 30, for the multicast groups in a specific group address range, the
Admin-scope 3
G3 address
−
G2 address
Figure 31, the admin-scoped zones 1 and 2 have no intersection, but the
Admin-scope 2
G2 address
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