Group policy and simulated joining configuration example(for VLANs)

As shown in Figure 14, Router A runs IGMPv2 and acts as the IGMP querier. Switch A runs IGMPv2 snooping.

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

• Host A and Host B receive only the multicast data addressed to multicast group 224.1.1.1. Multicast data can be forwarded through Ten-GigabitEthernet 1/0/3 and Ten-GigabitEthernet 1/0/4 of Switch A uninterruptedly, even though Host A and Host B fail to receive the multicast data.

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

1. Assign an IP address and subnet mask to each interface, as shown in Figure 14. (Details not shown.)

2. Configure Router A:

   # Enable IP multicast routing.

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

   # Enable IGMP on Ten-GigabitEthernet 1/0/1.

   [RouterA] interface ten-gigabitethernet 1/0/1
   [RouterA-Ten-GigabitEthernet1/0/1] igmp enable
   [RouterA-Ten-GigabitEthernet1/0/1] quit
   

   # Enable PIM-DM on Ten-GigabitEthernet 1/0/2.

   [RouterA] interface ten-gigabitethernet 1/0/2
   [RouterA-Ten-GigabitEthernet1/0/2] pim dm
   [RouterA-Ten-GigabitEthernet1/0/2] quit
   

3. Configure Switch A:

   # Enable the IGMP snooping feature.

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

   # Create VLAN 100, and assign Ten-GigabitEthernet 1/0/1 through Ten-GigabitEthernet 1/0/4 to the VLAN.

   [SwitchA] vlan 100
   [SwitchA-vlan100] port ten-gigabitethernet 1/0/1 to ten-gigabitethernet 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 hosts in VLAN 100 can join only multicast group 224.1.1.1.

   [SwitchA] acl basic 2001
   [SwitchA-acl-ipv4-basic-2001] rule permit source 224.1.1.1 0
   [SwitchA-acl-ipv4-basic-2001] quit
   [SwitchA] igmp-snooping
   [SwitchA-igmp-snooping] group-policy 2001 vlan 100
   [SwitchA-igmp-snooping] quit
   

   # Configure Ten-GigabitEthernet 1/0/3 and Ten-GigabitEthernet 1/0/4 as simulated member hosts of multicast group 224.1.1.1.

   [SwitchA] interface ten-gigabitethernet 1/0/3
   [SwitchA-Ten-GigabitEthernet1/0/3] igmp-snooping host-join 224.1.1.1 vlan 100
   [SwitchA-Ten-GigabitEthernet1/0/3] quit
   [SwitchA] interface ten-gigabitethernet 1/0/4
   [SwitchA-Ten-GigabitEthernet1/0/4] igmp-snooping host-join 224.1.1.1 vlan 100
   [SwitchA-Ten-GigabitEthernet1/0/4] 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 group entries for 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 ports (2 in total):
      XGE1/0/3                              (00:03:23)
      XGE1/0/4                              (00:04:10)

The output shows the following information:

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

• Host A and Host B have failed to join multicast group 224.2.2.2.