Group policy configuration example

As shown in Figure 12, Router A runs IGMPv2 and acts as the IGMP querier. Switch A runs IGMPv2 snooping.

Configure a multicast group policy and simulate joining to meet the following requirements:

• Host A and Host B receive only the multicast data addressed to multicast group 224.1.1.1.

• Switch A drops unknown multicast data instead of flooding it in VLAN 100.

1. Assign an IP address and subnet mask to each interface according to Figure 12. (Details not shown.)

2. On Router A:

   # Enable IP multicast routing.

   <RouterA> system-view
   [RouterA] multicast routing
   [RouterA-mrib] quit
   

   # Enable IGMP and PIM-DM on FortyGigE 1/0/1.

   [RouterA] interface fortygige 1/0/1
   [RouterA-FortyGigE1/0/1] igmp enable
   [RouterA-FortyGigE1/0/1] pim dm
   [RouterA-FortyGigE1/0/1] quit
   

   # Enable PIM-DM on FortyGigE 1/0/2.

   [RouterA] interface fortygige 1/0/2
   [RouterA-FortyGigE1/0/2] pim dm
   [RouterA-FortyGigE1/0/2] quit
   

3. Configure Switch A:

   # Enable IGMP snooping globally.

   <SwitchA> system-view
   [SwitchA] igmp-snooping
   [SwitchA-igmp-snooping] quit
   

   # Create VLAN 100, and assign FortyGigE 1/0/1 through FortyGigE 1/0/4 to the VLAN.

   [SwitchA] vlan 100
   [SwitchA-vlan100] port fortygige 1/0/1 to fortygige 1/0/4
   

   # Enable IGMP snooping, and enable dropping unknown multicast data for VLAN 100.

   [SwitchA-vlan100] igmp-snooping enable
   [SwitchA-vlan100] igmp-snooping drop-unknown
   [SwitchA-vlan100] quit
   

   # Configure a multicast group policy so that the hosts in VLAN 100 can join only multicast group 224.1.1.1.

   [SwitchA] acl number 2001
   [SwitchA-acl-basic-2001] rule permit source 224.1.1.1 0
   [SwitchA-acl-basic-2001] quit
   [SwitchA] igmp-snooping
   [SwitchA-igmp-snooping] group-policy 2001 vlan 100
   [SwitchA-igmp-snooping] quit
   

# Send IGMP reports from Host A and Host B to join multicast groups 224.1.1.1 and 224.2.2.2. (Details not shown.)

# Display information about dynamic IGMP snooping forwarding entries in VLAN 100 on Switch A.

[SwitchA] display igmp-snooping group vlan 100
Total 1 entries.

VLAN 100: Total 1 entries.
  (0.0.0.0, 224.1.1.1)
    Host slots (1 in total):
      1
    Host ports (2 in total):
      FGE1/0/3
      FGE1/0/4

The output shows the following information:

• Host A and Host B have joined multicast group 224.1.1.1 through the member ports FortyGigE 1/0/4 and FortyGigE 1/0/3 on Switch A, respectively.

• Host A and Host B have failed to join multicast group 224.2.2.2. This means that the multicast group policy has taken effect.