HP 6125XLG R2306-HP 6125XLG Blade Switch IP Multicast Configuration Guide - Page 76
Relationship in view of geographical locations
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Figure 30 Relationship in view of geographical locations As shown in Figure 30, for the multicast groups in a specific group address range, the admin-scoped zones must be geographically separated and isolated. A router cannot belong to multiple admin-scoped zones. An admin-scoped zone contains routers that are different from other admin-scoped zones. However, the global-scoped zone includes all routers in the PIM-SM domain. Multicast packets that do not belong to any admin-scoped zones are forwarded in the entire PIM-SM domain. • In view of multicast group address ranges: Each admin-scoped zone provides services for 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. The global-scoped zone provides services for all the multicast groups other than those of the admin-scoped zones. Figure 31 Relationship in view of multicast group address ranges Admin-scope 1 G1 address Admin-scope 3 G3 address Global-scope G−G1−G2 address Admin-scope 2 G2 address As shown in Figure 31, the admin-scoped zones 1 and 2 have no intersection, but the admin-scoped zone 3 is a subset of the admin-scoped zone 1. The global-scoped zone provides services for all the multicast groups that are not covered by the admin-scoped zones 1 and 2, G−G1−G2 in this case. 69