Operation Manual – Multicast
H3C S5500-EI Series Ethernet Switches
Chapter 7 PIM Configuration
7-13
Figure 7-8
Relationship between BSR admin-scope regions and the global scope zone
in group address ranges
In
Figure 7-8
, 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:
z
The global scope zone and each BSR admin-scope region have their own C-RPs
and BSR. These devices are effective only in their respective admin-scope
regions. Namely, the BSR election and RP election are implemented
independently within each admin-scope region.
z
Each BSR admin-scope region has its own boundary. The multicast information
(such as C-RP-Adv messages and BSR bootstrap messages) can be transmitted
only within the domain.
z
Likewise, the multicast information in the global scope zone cannot enter any BSR
admin-cope region.
z
In terms of multicast information propagation, BSR admin-scope regions are
independent of one another and each BSR admin-scope region is independent of
the global scope zone, and no overlapping is allowed between any two BSR
admin-scope regions.
7.1.6 SSM Model Implementation in PIM
The source-specific multicast (SSM) model and the any-source multicast (ASM) model
are two opposite models. Presently, the ASM model includes the PIM-DM and PIM-SM
modes. The SSM model can be implemented by leveraging part of the PIM-SM
technique.