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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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IPv4 Multicast Protocols

IPv4 Multicast Protocols

In IP multicast transmission, the sender only needs to send data to a specified destination address and does not need to know the locations of receivers. It is the responsibility of network devices to forward data from the sender to the receivers. Multicast devices on the network must collect information about senders and duplicate and forward multicast data along the correct path. During multicast development, a complete suite of protocols are introduced.

Table 1-8 describes multicast protocols on an IPv4 network.

Table 1-8 IPv4 multicast protocols




Internet Group Management Protocol (IGMP)

IGMP manages IPv4 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 IGMP protocol to join or leave multicast groups. Layer 3 multicast devices use the IGMP protocol to manage and maintain group memberships. IGMP can interact with upper-layer multicast routing protocols.

IGMP has three versions: IGMPv1, IGMPv2, and IGMPv3.

All these versions support the any-source multicast (ASM) model. IGMPv3 can be independently used in the SSM model, whereas IGMPv1 and IGMPv2 use source-specific multicast (SSM) mapping.

Protocol Independent Multicast (PIM)

PIM runs on an IPv4 network and sends multicast data to multicast devices connected to group members interested in the data.

The CE12800 and CE12800E series switches support Protocol Independent Multicast - Dense Mode (PIM-DM), Protocol Independent Multicast - Sparse Mode (PIM-SM) and Bidirectional Protocol Independent Multicast (Bidirectional PIM). PIM-DM applies to small-scale networks with densely distributed group members, and PIM-SM applies to the large network where receivers are widely distributed, and Bidirectional PIM applies to the network with multiple multicast sources.

The PIM-DM model does not need to differentiate between ASM and SSM.

The PIM-SM model differentiates between ASM and SSM based on multicast addresses in data and protocol packets.
  • If multicast addresses of packets are in the SSM group address range, PIM-SM uses the SSM model to provide multicast services. The 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 ASM group address range, PIM-SM uses the ASM model to provide multicast services.

Multicast Source Discovery Protocol (MSDP)

MSDP is an inter-domain multicast protocol that implements multicast forwarding between PIM-SM domains. Multicast devices in a PIM-SM domain use MSDP to discover multicast sources in other PIM-SM domains, and send information about active sources in other PIM-SM domains to receivers in the local PIM domain.

MSDP is required only when the ASM model is used.

Multiprotocol Border Gateway Protocol (MBGP)

MBGP enables multicast data to be transmitted between multicast sources and receivers in different autonomous systems (ASs).


IGMP snooping and IGMP snooping proxy

IGMP snooping enables a switch to create and maintain a Layer 2 multicast forwarding table by listening to IGMP packets exchanged between the upstream Layer 3 device and user hosts. The switch controls forwarding of multicast data packets based on the Layer 2 multicast forwarding table to reduce multicast data flooding on the Layer 2 network.

IGMP snooping proxy enables the switch to act in place of an upstream device to send IGMP Query messages and receive IGMP Report/Leave messages from downstream devices. This function saves bandwidth between the upstream device and local switch.

IGMP snooping is an extension of IGMP on Layer 2 network devices. You can specify the IGMP snooping version on a switch to enable the switch to process IGMP packets of specific versions.

Updated: 2019-04-20

Document ID: EDOC1100074724

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