R3303-HP 6600/HSR6600 Routers IP Multicast Configuration Guide

IGMP snooping querier configuration example

Network requirements

As shown in Figure 16, in a Layer 2–only network environment, two multicast sources Source 1 and

Source 2 send multicast data to multicast groups 224.1.1.1 and 225.1.1.1, respectively. Host A and Host C

are receivers of multicast group 224.1.1.1. Host B and Host D are receivers of multicast group 225.1.1.1.

IGMPv2 runs on all the receivers, and IGMPv2 snooping runs on all the routers. Router A, which is close

to the multicast sources, is chosen as the IGMP snooping querier.

To prevent flooding of unknown multicast traffic within the VLAN, be sure to configure all the routers to

drop unknown multicast data packets.

Because the SAP module does not enlist a port that has heard an IGMP query with a source IP address

of 0.0.0.0 (default) as a dynamic router port, configure a non-all-zero IP address as the source IP address

of IGMP queries to ensure normal creation of Layer 2 multicast forwarding entries.

Figure 16 Network diagram

Configuration procedure

1. Configure Router A:

# Enable IGMP snooping globally.

<RouterA> system-view

[RouterA] igmp-snooping

[RouterA-igmp-snooping] quit

# Create VLAN 100 and assign GigabitEthernet 2/0/1 through GigabitEthernet 2/0/3 to the

VLAN.

[RouterA] vlan 100

[RouterA-vlan100] port gigabitethernet 2/0/1 to gigabitethernet 2/0/3

# Enable IGMP snooping and the function of dropping unknown multicast traffic in VLAN 100.

[RouterA-vlan100] igmp-snooping enable

[RouterA-vlan100] igmp-snooping drop-unknown

# Enable the IGMP snooping querier function in VLAN 100