4000 Router Series IP Multicast Configuration Guide

IGMP configuration example

Network requirements

AS shown in Figure 23, VOD streams are sent to receiver hosts in multicast. Receiver hosts of different

organizations form stub networks N1 and N2. Host A and Host C are receiver hosts in N1 and N2,

respectively.

IGMPv2 runs between Router A and N1, and between the other two routers and N2. Router A acts as the

IGMP querier in N1. Router B acts as the IGMP querier in N2 because it has a lower IP address.

The hosts in N1 can join only the multicast group 224.1.1.1. The hosts in N2 can join any multicast groups.

Figure 23 Network diagram

Configuration procedure

1. Assign the IP address and subnet mask of each interface as shown in Figure 23. (Details not

shown.)

2. Configure OSPF on the PIM network to make sure the network-layer is interoperable on the PIM

network and the routing information among the routers can be dynamically updated. (Details not

shown.)

3. Enable IP multicast routing, and enable IGMP and PIM-DM:

# On Router A, enable IP multicast routing globally, enable IGMP on Ethernet 1/1, and enable

PIM-DM on each interface.

<RouterA> system-view

[RouterA] multicast routing

[RouterA-mrib] quit

[RouterA] interface ethernet 1/1

[RouterA-Ethernet1/1] igmp enable

Router A

Router B

Router C

Querier

PIM network

Receiver

Host A

Host B

Host C

Host D

Eth1/1

10.110.1.1/24

Eth1/1

10.110.2.1/24

Eth1/1

10.110.2.2/24