3Com Switch 4800G 24-Port Configuration Manual page 638

638 C 47: PIM C
HAPTER ONFIGURATION
Figure 193 Relationship between BSR admin-scope regions and the global scope zone in
geographic space
C-RP
C-RP
BSR admin-scope regions are geographically separated from one another. Namely,
a router must not serve different BSR admin-scope regions. In other words,
different BSR admin-scope regions contain different routers, whereas the global
scope zone covers all routers in the PIM-SM domain.
2 In terms of multicast group address ranges
Each BSR admin-scope region serves specific multicast groups. Usually, these
addresses have no intersections; however, they may overlap one another.
Figure 194 Relationship between BSR admin-scope regions and the global scope zone in
group address ranges
BSR 1
G1 address
Global
G-G1-G2 address
In Figure 194, the group address ranges of admin-scope-scope regions BSR1 and
BSR2 have no intersection, whereas the group address range of BSR3 is a subset of
the address range of BSR1. The group address range of the global scope zone
covers all the group addresses other than those of all the BSR admin-scope
regions. That is, the group address range of the global scope zone is G-G1-G2. In
other words, there is a supplementary relationship between the global scope zone
and all the BSR admin-scope regions in terms of group address ranges.
Relationships between BSR admin-scope regions and the global scope zone are as
follows:
C-RP BSR
BSR 2
BSR
BSR 1
C-RP BSR
Global
BSR
BSR 3
G3 address
BSR 2
G2 address
C-RP BSR
BSR 3
C-RP BSR