287
Figure 95 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
7 lists the possible values of the scope field.
Table 17 Values of the Scope field
Value Meaning Remarks
0, F Reserved N/A
1 Interface-local scope N/A
2 Link-local scope N/A
3 Subnet-local scope IPv6 admin-scoped zone.
4 Admin-local scope IPv6 admin-scoped zone.
5 Site-local scope IPv6 admin-scoped zone.
6, 7, 9 through D Unassigned IPv6 admin-scoped zone.
8 Organization-local scope IPv6 admin-scoped zone.
E Global scope IPv6 global-scoped zone.
IPv6 PIM-SSM overview
The ASM model includes IPv6 PIM-DM and IPv6 PIM-SM. The SSM model can be implemented 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 relationship between
hosts and routers through MLDv2.
In actual applications, part of MLDv2 and IPv6 PIM-SM techniques are adopted to implement the SSM
model. In the SSM model, because receivers have located an IPv6 multicast source, no RP or RPT is
required. No source registration process is required for discovering IPv6 multicast sources in other IPv6
PIM domains.
Neighbor discovery
IPv6 PIM-SSM uses the same neighbor discovery mechanism as IPv6 PIM-SM. For more information, see
"Neighbor discovery."
DR election
IPv6 PIM-SSM uses the same DR election mechanism as IPv6 PIM-SM. For more information, see "DR
election."
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