Configuring Ipv6 Pim - HP A8800 Configuration Manual

Configuring IPv6 PIM

Overview
Protocol Independent Multicast for IPv6 (IPv6 PIM) provides IPv6 multicast forwarding by leveraging IPv6
unicast static routes or IPv6 unicast routing tables generated by any IPv6 unicast routing protocol, such
as RIPng, OSPFv3, IS-ISv6, or BGP4+. IPv6 PIM uses an IPv6 unicast routing table to perform reverse
path forwarding (RPF) check to implement IPv6 multicast forwarding. Independent of the IPv6 unicast
routing protocols running on the device, IPv6 multicast routing can be implemented as long as the
corresponding IPv6 multicast routing entries are created through IPv6 unicast routes. IPv6 PIM uses the
reverse path forwarding (RPF) mechanism to implement IPv6 multicast forwarding. When an IPv6
multicast packet arrives on an interface of the device, it is subject to an RPF check. If the RPF check
succeeds, the device creates the corresponding routing entry and forwards the packet. If the RPF check
fails, the device discards the packet. For more information about RPF, see
routing and
Based on the implementation mechanism, IPv6 PIM supports the following types:
IPv6 Protocol Independent Multicast–Dense Mode (IPv6 PIM-DM)
•
• IPv6 Protocol Independent Multicast–Sparse Mode (IPv6 PIM-SM)
IPv6 Bidirectional Protocol Independent Multicast (IPv6 BIDIR-PIM)
•
IPv6 Protocol Independent Multicast Source-Specific Multicast (IPv6 PIM-SSM)
•
To facilitate description, a network comprising IPv6 PIM–supporting routers is referred to as an "IPv6 PIM
domain" in this document.
The router supports IPv6 BIDIR-PIM only when the system is operating in SPE mode. For more information
about system operating modes, see Fundamentals Configuration Guide.
IPv6 PIM-DM overview
IPv6 PIM-DM is a type of dense mode IPv6 multicast protocol. It uses the "push mode" for IPv6 multicast
forwarding, and is suitable for small-sized networks with densely distributed IPv6 multicast members.
The basic implementation of IPv6 PIM-DM is as follows:
IPv6 PIM-DM assumes that at least one IPv6 multicast group member exists on each subnet of a
•
network, and therefore IPv6 multicast data is flooded to all nodes on the network. Then, branches
without IPv6 multicast forwarding are pruned from the forwarding tree, leaving only those branches
that contain receivers. This "flood and prune" process takes place periodically, that is, pruned
branches resume IPv6 multicast forwarding when the pruned state times out and then data is
re-flooded down these branches, and then are pruned again.
When a new receiver on a previously pruned branch joins an IPv6 multicast group, to reduce the
•
join latency, IPv6 PIM-DM uses the graft mechanism to resume IPv6 multicast data forwarding to
that branch.
Generally speaking, the IPv6 multicast forwarding path is a source tree, namely a forwarding tree with
the IPv6 multicast source as its "root" and IPv6 multicast group members as its "leaves". Because the
forwarding."
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"Configuring IPv6 multicast