Chapter 15
IPv6 Static Multicast
Configuration
Table of Contents
15.1 IPv6 Static Multicast Introduction
Static multicast routes are applied in the scenario where multicast packets are expected
to be forwarded along the specified path rather than the optimal path in unicast routing.
Static multicast routing provides ingress and egress interfaces for configuring the multicast
routing table, and creates the multicast forwarding table based on the user configuration. If
static and dynamic multicast routes are available at the same time, static multicast routes
are selected due to a higher priority. Static multicast routing can be considered as a special
multicast routing protocol.
The applications of static multicast routing vary with the application scenario:
l
Changing
routes.
In general, the multicast networking structure is the same as the unicast networking
structure, and the transport path for multicast packets is the same as that for unicast
packets. RPF routes can be changed through the static multicast route configuration,
which creates a transport path for multicast packets. This path is different from the
transport path for unicast packets.
l
Re-establishing RPF routes.
When unicast routes are blocked, packets (including multicast packets) cannot be
forwarded due to no RPF routes.
RPF routes are generated through the static
multicast route configuration, and the multicast routing table is generated for the
forwarding of multicast packets.
When the multicast routing table is created by using the multicast routing protocol, the RPF
check mechanism is used to ensure the loop-free forwarding of multicast packets along
correct paths.
Three paths are separately selected from the unicast routing table,
routing table,
and static multicast routing table, and the optimal path to the multicast source is determined
based on one of the following rules:
15-1
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