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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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Multicast Deployment on an IPv4 Network

Multicast Deployment on an IPv4 Network

This section describes typical multicast service scenarios on an IPv4 network and applications of multicast protocols. Configure multicast services based on the actual situations and service requirements on your network. This section provides only deployment of basic multicast services.

Before deploying IPv4 multicast services on a network, ensure that IPv4 unicast routes on the network are reachable.

Multicast Within a PIM Domain

On a small-scale network, all network devices and hosts belong to the same PIM domain. Figure 1-7 shows this type of multicast service deployment.

Figure 1-7  Multicast service deployment within a PIM domain

Table 1-10  Protocols used for multicast within a PIM domain

Protocol

Application Position

Purpose

PIM (mandatory)

PIM must be configured on all interfaces of Layer 3 multicast devices in the PIM domain, including all interfaces of RouterA and RouterB.

For the configuration procedure, see IPv4 PIM Configuration.

PIM sends multicast data from the multicast source to RouterB, which is connected to multicast receivers.

IGMP (mandatory)

IGMP must be configured on user-side interface of Layer 3 multicast device RouterB.

For the configuration procedure, see IGMP Configuration.

IGMP allows receiver hosts to join or leave multicast groups, and allows RouterB to maintain and manage multicast memberships.

Multicast Between PIM-SM Domains

A multicast domain can be divided into multiple isolated PIM-SM domains to facilitate the management of multicast resources, including groups, multicast sources, and group members. To enable the PIM-SM domains to exchange multicast data, MSDP needs to be deployed between them, as shown in Figure 1-8.

NOTE:

MSDP is not required when PIM-SM uses the SSM model.

Figure 1-8  Multicast service deployment between PIM-SM domains

Table 1-11  Multicast protocols used for multicast between PIM-SM domains

Protocol

Application Position

Purpose

PIM-SM (mandatory)

PIM-SM must be configured on all Layer 3 interfaces of multicast devices in the PIM-SM domains, including all interfaces of Routers A to F.

For the configuration procedure, see Configuring IPv4 PIM-SM.

PIM-SM sends multicast data from multicast sources Source1 and Source2 to RouterF, which is connected to multicast receivers. After receiver hosts join a multicast group, multicast data is forwarded to the receiver hosts through rendezvous points (RPs) in the PIM-SM domains.

IGMP (mandatory)

IGMP must be configured on user-side interfaces of Layer 3 multicast device RouterF in the PIM-SM domains.

For the configuration procedure, see IGMP Configuration.

IGMP allows receiver hosts to join or leave multicast groups, and allows RouterF to maintain and manage multicast memberships.

MSDP (mandatory)

MSDP must be configured on the RP in each PIM-SM domain, that is, RouterC and RouterD.

For the configuration procedure, see MSDP Configuration.

MSDP transmits multicast data between PIM-SM1 and PIM-SM2. Host in PIM-SM2 can receive data from Source1.

Inter-AS Multicast

PIM forwards multicast data based on a unicast routing table; therefore, multicast forwarding paths are the same as unicast forwarding paths. When a multicast source and receivers are located in different autonomous systems (ASs), a multicast distribution tree needs to be set up between the ASs. In this scenario, MBGP can be used to create a multicast routing table independent of the unicast routing table. Then multicast data is transmitted based on the multicast routing table. Figure 1-9 shows the inter-AS multicast service deployment.
NOTE:

Before configuring MBGP between ASs, configure BGP between the ASs.

Figure 1-9  Inter-AS multicast service deployment

Table 1-12  Multicast protocols used for inter-AS multicast

Protocol

Application Position

Purpose

PIM-SM (mandatory)

PIM-SM must be configured on all interfaces of Layer 3 multicast devices in the PIM-SM domains, including all interfaces of Routers A to H.

For the configuration procedure, see Configuring IPv4 PIM-SM.

PIM-SM sends multicast data from multicast sources Source1 and Source2 to RouterB and RouterH, which are connected to multicast receivers. After receiver hosts join a multicast group, multicast data is forwarded to the receiver hosts through RPs in the PIM-SM domains.

IGMP (mandatory)

IGMP must be configured on user-side interfaces of Layer 3 multicast devices RouterB and RouterH in the PIM-SM domains.

For the configuration procedure, see IGMP Configuration.

IGMP allows receiver hosts to join or leave multicast groups, and allows RouterB and RouterH to maintain and manage multicast memberships.

MBGP (mandatory)

MBGP must be configured on RouterA and RouterF located at the AS borders.

For the configuration procedure, see Configuring MP-BGP.

MBGP sends multicast data from multicast sources Source1 and Source2 to receivers in another AS based on an independent multicast routing table.

MSDP (mandatory)

MSDP must be configured on the RP in each PIM-SM: RouterA, RouterD, and RouterF.

For the configuration procedure, see MSDP Configuration.

MSDP transmits multicast data among PIM-SM1, PIM-SM2, and PIM-SM3.

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Updated: 2019-08-09

Document ID: EDOC1100034230

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