Ipv6 Pim-Ssm Overview - HP 6125G Configuration Manual

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
Table 1 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 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
•
lists the possible values of the scope field.
Meaning
Reserved
Interface-local scope
Link-local scope
Subnet-local scope
Admin-local scope
Site-local scope
Unassigned
Organization-local scope
Global scope
297
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