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CLI-based Configuration Guide - IP Multicast

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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IPv6 Multicast Protocols

IPv6 Multicast Protocols

Table 1-9 describes multicast protocols on an IPv6 network.

Table 1-9  IPv6 multicast protocols




Multicast Listener Discovery (MLD)

MLD manages IPv6 multicast group members and runs on the end of a multicast network (network segments where Layer 3 multicast devices connect to user hosts). Hosts use the MLD protocol to join or leave multicast groups. Layer 3 multicast devices use the MLD protocol to manage and maintain group memberships. MLD can interact with upper-layer multicast routing protocols.

MLD has two versions: MLDv1 and MLDv2.

MLDv2 can be independently used in the source-specific multicast (SSM) model, whereas MLDv1 must use SSM mapping.

MLD works on an IPv6 network in the same way IGMP works on an IPv4 network. MLDv1 is similar to IGMPv2, and MLDv2 is similar to IGMPv3.

Protocol Independent Multicast (PIM) for IPv6

IPv6 PIM runs on an IPv6 network and sends multicast data to multicast devices connected to multicast group members interested in the data flows.

IPv6 PIM works in sparse mode (PIM-SM) or dense mode (PIM-DM). IPv6 PIM-SM applies to large-scale networks with sparsely distributed group members, and IPv6 PIM-DM applies to small-scale networks with densely distributed group members.

IPv6 PIM-DM does not need to differentiate between the any-source multicast (ASM) and SSM models.

IPv6 PIM-SM differentiates between the ASM and SSM models based on multicast addresses in multicast data and protocol packets.
  • If multicast addresses of packets are in the range of SSM group addresses, IPv6 PIM-SM uses the SSM model to provide multicast services. The IPv6 PIM-SSM model is efficient and simplifies the multicast address allocation process. It is applicable when a group has only one specific source.
  • If multicast addresses of packets are in the range of ASM group addresses, IPv6 PIM-SM uses the ASM model to provide multicast services.
Updated: 2019-08-09

Document ID: EDOC1100034230

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