Operation Manual – Multicast ProtocolH3C S3610&S5510 Series Ethernet Switches Chapter 6 PIM Configuration6-13BSR 3G3 addressBSR 2G2 addressBSR 1G1 addressGlobalG-G1-G2 addressFigure 6-8 Relationship between BSR admin-scope regions and the global scope zonein group address rangesIn Figure 6-8, the group address ranges of admin-scope-scope regions BSR1 andBSR2 have no intersection, whereas the group address range of BSR3 is a subset ofthe address range of BSR1. The group address range of the global scope zone coversall 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 isa supplementary relationship between the global scope zone and all the BSRadmin-scope regions in terms of group address ranges.Relationships between BSR admin-scope regions and the global scope zone are asfollows:z The global scope zone and each BSR admin-scope region have their own C-RPsand BSR. These devices are effective only in their respective admin-scoperegions. Namely, the BSR election and RP election are implementedindependently 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 transmittedonly within the domain.z Likewise, the multicast information in the global scope zone cannot enter any BSRadmin-cope region.z In terms of multicast information propagation, BSR admin-scope regions areindependent of one another and each BSR admin-scope region is independent ofthe global scope zone, and no overlapping is allowed between any two BSRadmin-scope regions.6.1.6 SSM Model Implementation in PIMThe source-specific multicast (SSM) model and the any-source multicast (ASM) modelare two opposite models. Presently, the ASM model includes the PIM-DM and PIM-SMmodes. The SSM model can be implemented by leveraging part of the PIM-SMtechnique.
