Ipv6 Multicast Routing And Forwarding Configuration (Available Only On The A5500 Ei); Ipv6 Multicast Routing And Forwarding Overview; Rpf Check Mechanism - HP A5500 SI Switch Series Configuration Manual

IPv6 multicast routing and forwarding
configuration (available only on the A5500 EI)
NOTE:
router
The term
The interfaces in this document refer to Layer 3 interfaces in generic sense and Ethernet interfaces
operating in route mode. For more information about the operating mode of the Ethernet interface,
see in the

IPv6 multicast routing and forwarding overview

In IPv6 multicast implementations, the following types of tables implement multicast routing and
forwarding:
Multicast routing table of an IPv6 multicast routing protocol—Each IPv6 multicast routing protocol
•
has its own multicast routing table, such as IPv6 PIM routing table.
General IPv6 multicast routing table—The multicast routing information of different IPv6 multicast
•
routing protocols forms a general IPv6 multicast routing table.
IPv6 multicast forwarding table—The IPv6 multicast forwarding table guides the forwarding of IPv6
•
multicast packets.
An IPv6 multicast forwarding table consists of a set of (S, G) entries. Each entry indicates the routing
information for delivering multicast data from a multicast source to a multicast group. If a router supports
multiple IPv6 multicast protocols, its IPv6 multicast routing table will include routes that these protocols
generated. The router chooses the optimal route from the IPv6 multicast routing table based on the
configured multicast routing and forwarding policy and installs the route entry into its IPv6 multicast
forwarding table.

RPF check mechanism

An IPv6 multicast routing protocol relies on the existing IPv6 unicast routing information or IPv6 MBGP
routes in creating IPv6 multicast routing entries. When creating IPv6 multicast routing table entries, an
IPv6 multicast routing protocol uses the RPF check mechanism to ensure IPv6 multicast data delivery
along the correct path. In addition, the RPF check mechanism also helps avoid data loops caused by
various reasons.
RPF check process
An RPF check is based on one of the following routing tables:
IPv6 unicast routing table—Contains the shortest path to each destination subnet
•
IPv6 MBGP routing table—Contains IPv6 multicast routing information
•
When performing an RPF check, a router searches its IPv6 unicast routing table and IPv6 MBGP routing
table at the same time. The specific process is as follows:
in this document refers to both routers and Layer 3 switches.
Layer 2—LAN Switching Configuration Guide.
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