R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

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As shown in Figure 51, for the IPv6 multicast groups with the same scope field value, the IPv6
admin-scope zones must be geographically separated and isolated. The IPv6 global-scoped zone
includes all routers in the IPv6 PIM-SM domain. IPv6 multicast packets that do not belong to any
IPv6 admin-scope zones are forwarded in the entire IPv6 PIM-SM domain.
• In view of the scope field values
In terms of the scope field values, the scope field in an IPv6 multicast group address shows which
zone the IPv6 multicast group belongs to.
Figure 52 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 6 lists the po
ssible values of the scope field.
Table 6 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.
Protocols and standards
• RFC 3973, Protocol Independent Multicast-Dense Mode (PIM-DM): Protocol Specification(Revised)
• RFC 4601, Protocol Independent Multicast-Sparse Mode (PIM-SM): Protocol Specification (Revised)
• RFC 3956, Embedding the Rendezvous Point (RP) Address in an IPv6 Multicast Address
• RFC 5059, Bootstrap Router (BSR) Mechanism for Protocol Independent Multicast (PIM)