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 PIM
PIM overview
Protocol Independent Multicast for IPv6 (IPv6 PIM) provides IPv6 multicast forwarding by leveraging IPv6
unicast static routes or IPv6 unicast routing tables generated by any IPv6 unicast routing protocol, such
as RIPng, OSPFv3, IPv6 IS-IS, or IPv6 BGP. IPv6 PIM is not dependent on any particular IPv6 unicast
routing protocol, and it uses the underlying IPv6 unicast routing to generate a routing table with routes.
IPv6 PIM uses the RPF mechanism to implement multicast forwarding. When an IPv6 multicast packet
arrives on an interface of the device, the packet undergoes an RPF check. If the RPF check succeeds, the
device creates an IPv6 multicast routing entry and forwards the packet. If the RPF check fails, the device
discards the packet. For more information about RPF, see "Configuring IPv6 multicast routing and
fo
rwarding."
Based on the implementation mechanism, IPv6 PIM includes the following categories:
• Protocol Independent Multicast–Dense Mode for IPv6 (IPv6 PIM-DM)
• Protocol Independent Multicast–Sparse Mode for IPv6 (IPv6 PIM-SM)
In this document, an IPv6 PIM domain refers to a network composed of IPv6 PIM routers.
The term "interface" in the IPv6 PIM 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).
IPv6 PIM-DM overview
IPv6 PIM-DM uses the push mode for multicast forwarding and is suitable for small networks with densely
distributed IPv6 multicast members.
The following describes the basic implementation of IPv6 PIM-DM:
• IPv6 PIM-DM assumes that all downstream nodes want to receive IPv6 multicast data when a source
starts sending, so IPv6 multicast data is flooded to all downstream nodes on the network.
• Branches without downstream receivers are pruned from the forwarding trees, leaving only those
branches that contain receivers.
• The pruned state of a branch has a finite holdtime timer. When the timer expires, IPv6 multicast
data is again forwarded to the pruned branch. This flood-and-prune cycle takes place periodically
to maintain the forwarding branches.
• To reduce join latency when a new receiver on a previously pruned branch joins an IPv6 multicast
group, IPv6 PIM-DM uses a graft mechanism to turn the pruned branch into a forwarding branch.