Ipv6 Pim-Ssm Overview - HP A8800 Configuration Manual

Figure 112 IPv6 multicast address format
The admin-scoped zone range increases with the value of the Scope field. For example, value E
indicates IPv6 global-scoped, which contains other admin-scoped zones with the Scope field
values smaller than E. Possible values of the Scope field are given in
Table 26 Values of the Scope field
Value
0, F
1
2
3
4
5
6, 7, 9 through D
8
E

IPv6 PIM-SSM overview

The source-specific multicast (SSM) model and the any-source multicast (ASM) model are two opposite
models. Currently, the ASM model includes the IPv6 PIM-DM and IPv6 PIM-SM modes. The SSM model
can be implemented by leveraging part of the IPv6 PIM-SM technique, and it is also called IPv6
PIM-SSM.
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 means of
advertisements, consultancy, and so on. Therefore, no RP is needed, no RPT is required, and is no source
registration process is needed for the purpose of discovering IPv6 multicast sources in other IPv6 PIM
domains.
In IPv6 PIM-SSM, the "channel" concept is used to refer to an IPv6 multicast group, and the "channel
subscription" concept is used to refer to a join message.
The working mechanism of the IPv6 PIM-SSM is summarized as follows:
Neighbor discovery
•
DR election
•
SPT building
•
Meaning
Reserved
Interface-local scope
Link-local scope
Subnet-local scope
Admin-local scope
Site-local scope
Unassigned
Organization-local scope
Global-scoped
387
Table 26.
Remarks
N/A
N/A
N/A
IPv6 admin-scoped zone.
IPv6 admin-scoped zone.
IPv6 admin-scoped zone.
IPv6 admin-scoped zone.
IPv6 admin-scoped zone.
IPv6 global-scoped zone.