R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide
Table Of Contents
- Title Page
- Contents
- Multicast overview
- Configuring IGMP snooping
- Overview
- IGMP snooping configuration task list
- Configuring basic IGMP snooping functions
- Configuring IGMP snooping port functions
- Configuring IGMP snooping policies
- Displaying and maintaining IGMP snooping
- IGMP snooping configuration examples
- Troubleshooting IGMP snooping
- Configuring multicast routing and forwarding
- Configuring IGMP
- Configuring PIM
- Overview
- Configuring PIM-DM
- Configuring PIM-SM
- Configuring common PIM features
- Displaying and maintaining PIM
- PIM configuration examples
- Troubleshooting PIM
- Configuring MLD snooping
- Overview
- MLD snooping configuration task list
- Configuring basic MLD snooping functions
- Configuring MLD snooping port functions
- Configuring MLD snooping policies
- Displaying and maintaining MLD snooping
- MLD snooping configuration examples
- Troubleshooting MLD snooping
- Configuring IPv6 multicast routing and forwarding
- Configuring MLD
- Configuring IPv6 PIM
- PIM overview
- Configuring IPv6 PIM-DM
- Configuring IPv6 PIM-SM
- Configuring common IPv6 PIM features
- Displaying and maintaining IPv6 PIM
- IPv6 PIM configuration examples
- Troubleshooting IPv6 PIM
- Support and other resources
- Index
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Configuring IPv6 multicast routing and
forwarding
Overview
IPv6 multicast routing and forwarding uses the following tables:
• IPv6 multicast protocols' routing tables, such as the IPv6 PIM routing table.
• General IPv6 multicast routing table that summarizes the multicast routing information of different
IPv6 multicast routing protocols. The IPv6 multicast routing information from IPv6 multicast sources
to IPv6 multicast groups are stored in a set of (S, G) routing entries.
• IPv6 multicast forwarding table that guides IPv6 multicast forwarding. The optimal routing entries in
the IPv6 multicast routing table are added to the IPv6 multicast forwarding table.
The term "interface" in the IPv6 multicast routing and forwarding features collectively refers to Layer 3
interfaces, including VLAN interfaces and Layer 3 Ethernet interfaces. You can set an Ethernet port as a
Layer 3 interface by using the port link-mode route command (see Layer 2—LAN Switching
Configuration Guide).
RPF check mechanism
An IPv6 multicast routing protocol relies on the existing IPv6 unicast routing information in creating IPv6
multicast routing entries. When creating IPv6 multicast routing table entries, an IPv6 multicast routing
protocol uses the reverse path forwarding (RPF) check mechanism to ensure IPv6 multicast data delivery
along the correct path. The RPF check mechanism also helps avoid data loops caused by various
reasons.
A multicast routing protocol uses the IPv6 unicast routing table to perform the RPF check.
RPF check process
When performing an RPF check, a router searches its IPv6 unicast routing table by using the IPv6 address
of the packet source as the destination address and automatically selects an optimal route. The outgoing
interface of the route is the RPF interface and the next hop is the RPF neighbor. The router considers the
path of the IPv6 multicast packet that the RPF interface receives from the RPF neighbor as the shortest path
that leads back to the source.
The term "packet source "can mean different things in different situations:
• For a packet that travels along the SPT from the multicast source to the receivers or the RP, the packet
source for RPF check is the multicast source.