14.1 Overview of IPv6 Multicast Routing Management
The system maintains a protocol routing table, multicast routing table, and multicast forwarding
table for multicast routing and forwarding. A multicast routing protocol creates multicast routing
entries through RPF.
In the IPv6 multicast network, PIM-IPv6 adopts the Reverse Path Forwarding (RPF) check,
creates, and updates routing entries, including the (*, G) entry and (S, G) entry. The RPF check
is implemented on the basis of RPF routes. IPv6 RPF routes are selected from unicast routes.
The multicast routing table records (S, G) entries and downloads the entries to the multicast
forwarding table. The multicast forwarding table directly guides the forwarding of multicast data
packets.
An (S, G) forwarding entry contains the following information:
l Source address S
l Group address G
l Incoming interface, which indicates that multicast data is received through this interface.
The incoming interface corresponds to the upstream interface of the related routing entry.
l Outgoing interface, which indicates that multicast data is sent out through this interface.
The outgoing interface corresponds to the downstream interface in the downstream
interface list of the related routing entry.
NOTE
IPv6 multicast forwarding and routing are similar to IPv4 multicast forwarding and routing. For details,
refer to the chapter "Multicast Forwarding and Routing" in the Quidway S7700 Smart Routing Switch
Feature Description - IP Multicast.
14.2 IPv6 Multicast Routing Management Features
Supported by the S7700
The IPv6 multicast routing management features supported by the system are: configuring IPv6
multicast routing policies, controlling the scope of multicast forwarding, controlling the
parameters of a multicast forwarding table, and configuring multicast splitting.
Configuring the IPv6 Multicast Routing Policy
When a switch enabled with IPv6 multicast selects the upstream interface, you need to configure
the route selection policy if multiple equal-cost unicast routes exist. You can configure the
switch to select the route with the highest next-hop address or configure load splitting.
Performing multicast load splitting according to different policies can optimize network traffic
transmission in the scenario where multiple multicast data flows exist.
There are five multicast load splitting policies: stable-preferred, balance-preferred, source
address-based, group address-based, and source and group addresses-based. The five load
splitting policies are mutually exclusive. In stable-preferred mode and balance-preferred mode,
you can configure IPv6 load splitting weights on the interfaces to achieve unbalanced multicast
load splitting.
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 14 IPv6 Multicast Routing Management
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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