Chapter 11
IPv6 Static Multicast
Configuration
Table of Contents
11.1 IPv6 Static Multicast Overview
Static multicast routes are used for forwarding multicast packets through a specific path
instead of the optimum path of the unicast route.
Static multicast provides the outgoing and incoming interfaces in the user-configured
multicast routing table. A multicast forwarding table is formed in accordance with the
configuration of users. If a static multicast route and a dynamic multicast route exist
concurrently, the static multicast route has a higher priority. The logical position of static
multicast is equal to PIM-SM and PIM-DM. It can be understood as a special multicast
routing protocol.
Static multicast routes serve the following two purposes in accordance with different
application environments:
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Changing RPF routes
In general, multicast has the same network topology architecture with unicast.
Multicast data is transmitted through the same path as the unicast data. A static
multicast route can be configured for changing an RPF route, so that a transmission
path different from that of unicast data is created for multicast data.
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Making an RPF route uninterrupted
When a unicast route is blocked in the network, data (including multicast data) cannot
be forwarded because of no RPF route. An RPF route can be generated by configuring
a static multicast route, so that a multicast table entry is created to guide multicast data
forwarding.
Multicast routing protocols use the RPF check mechanism during creation of multicast
routing entries to ensure that multicast data can be transmitted through a correct path.
This can also avoid generation of loops due to various reasons.
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