HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 308
IPv6 PIM-SSM overview
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Figure 88 IPv6 multicast address format An IPv6 admin-scoped zone with a larger scope field value contains an IPv6 admin-scoped zone with a smaller scope field value. The zone with the scope field value of E is the IPv6 global-scoped zone. Table 1 lists the possible values of the scope field. Table 1 Values of the Scope field Value 0, F 1 2 3 4 5 6, 7, 9 through D 8 E Meaning Reserved Interface-local scope Link-local scope Subnet-local scope Admin-local scope Site-local scope Unassigned Organization-local scope Global scope Remarks N/A N/A N/A IPv6 admin-scope zone IPv6 admin-scope zone IPv6 admin-scope zone IPv6 admin-scope zone IPv6 admin-scope zone IPv6 global-scope zone IPv6 PIM-SSM overview The source-specific multicast (SSM) model and the any-source multicast (ASM) model are opposites. The ASM model includes the IPv6 PIM-DM and IPv6 PIM-SM modes. You can implement the SSM model by leveraging part of the IPv6 PIM-SM technique. It is also called "IPv6 PIM-SSM." The SSM model provides a solution for source-specific multicast. It maintains the relationships between hosts and routers through MLDv2. In actual application, MLDv2 and part of IPv6 PIM-SM technique is adopted to implement the SSM model. In the SSM model, receivers know exactly where an IPv6 multicast source is located by using advertisements, consultancy, and so on. This model does not require RP or RPT, and it does not require a source registration process for the purpose of discovering IPv6 multicast sources in other IPv6 PIM domains. In IPv6 PIM-SSM, the term "channel " refers to an IPv6 multicast group, and the term "channel subscription" refers to a join message. The working mechanism of IPv6 PIM-SSM is summarized as follows: • Neighbor discovery • DR election • SPT building 297
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