Ipv6 Administrative Scoping Overview - HP FlexNetwork 7500 Series Configuration Manual

Figure 101 RPT building at the IPv6 multicast source side
As shown in
When an IPv6 multicast source sends multicast packets to the IPv6 multicast group G, the DF
1.
in each subnet unconditionally forwards the packets to the RP.
The routers along the path from the source's directly connected router to the RP constitute an
2.
RPT branch. Each router on this branch adds a (*, G) entry to its forwarding table.
After a bidirectional RPT is built, the IPv6 multicast sources send multicast traffic to the RP along the
source-side RPT. Then, the RP forwards the traffic to the receivers along the receiver-side RPT.
IMPORTANT:
If a receiver and a source are at the same side of the RP, the source-side RPT and the receiver-side
RPT might meet at a node before reaching the RP. In this case, the multicast packets from the IPv6
multicast source to the receiver are directly forwarded by the node, instead of by the RP.

IPv6 administrative scoping overview

Typically, an IPv6 PIM-SM domain or an IPv6 BIDIR-PIM domain contains only one BSR, which is
responsible for advertising RP-set information within the entire domain. Information about all IPv6
multicast groups is forwarded within the network that the BSR administers. This is called the "IPv6
non-scoped BSR mechanism."
IPv6 administrative scoping mechanism
To implement refined management, you can divide an IPv6 PIM-SM domain or IPv6 BIDIR-PIM
domain into an IPv6 global-scoped zone and multiple IPv6 administratively-scoped zones
(admin-scoped zones). This is called the "IPv6 administrative scoping mechanism."
The administrative scoping mechanism effectively releases stress on the management in a
single-BSR domain and enables provision of zone-specific services through private group
addresses.
An IPv6 admin-scoped zone is designated to particular IPv6 multicast groups with the same scope
field value in their group addresses. Zone border routers (ZBRs) form the boundary of an IPv6
admin-scoped zone. Each IPv6 admin-scoped zone maintains one BSR for IPv6 multicast groups
with the same scope field value. IPv6 multicast protocol packets, such as assert messages and
Figure 101, the process for building a source-side RPT is relatively simple:
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