Example: Configuring VLAN-based IGMP snooping static ports

As shown in Figure 15:

• Router A runs IGMPv2 and acts as the IGMP querier. Switch A, Switch B, and Switch C run IGMPv2 snooping.

• Host A and host C are permanent receivers of multicast group 224.1.1.1.

Configure static ports to meet the following requirements:

• To enhance the reliability of multicast traffic transmission, configure HundredGigE 1/0/3 and HundredGigE 1/0/5 on Switch C as static member ports for multicast group 224.1.1.1.

• Suppose the STP runs on the network. To avoid data loops, the forwarding path from Switch A to Switch C is blocked. Multicast data flows to the receivers attached to Switch C only along the path of Switch A—Switch B—Switch C. When this path is blocked, a minimum of one IGMP query-response cycle must be completed before multicast data flows to the receivers along the path of Switch A—Switch C. In this case, the multicast delivery is interrupted during the process. For more information about the STP, see Layer 2—LAN Switching Configuration Guide.

  Configure HundredGigE 1/0/3 on Switch A as a static router port. Then, multicast data can flow to the receivers nearly uninterruptedly along the path of Switch A—Switch C when the path of Switch A—Switch B—Switch C is blocked.

  Figure 15: Network diagram

  

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1. Assign an IP address and subnet mask to each interface, as shown in Figure 15. (Details not shown.)

2. Configure Router A:

   # Enable IP multicast routing.

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

   # Enable IGMP on HundredGigE 1/0/1.

   [RouterA] interface hundredgige 1/0/1
   [RouterA-HundredGigE1/0/1] igmp enable
   [RouterA-HundredGigE1/0/1] quit
   

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

   [RouterA] interface hundredgige 1/0/2
   [RouterA-HundredGigE1/0/2] pim dm
   [RouterA-HundredGigE1/0/2] 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 HundredGigE 1/0/1 through HundredGigE 1/0/3 to the VLAN.

   [SwitchA] vlan 100
   [SwitchA-vlan100] port hundredgige 1/0/1 to hundredgige 1/0/3
   

   # Enable IGMP snooping for VLAN 100.

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

   # Configure HundredGigE 1/0/3 as a static router port.

   [SwitchA] interface hundredgige 1/0/3
   [SwitchA-HundredGigE1/0/3] igmp-snooping static-router-port vlan 100
   [SwitchA-HundredGigE1/0/3] quit
   

4. Configure Switch B:

   # Enable the IGMP snooping feature.

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

   # Create VLAN 100, and assign HundredGigE 1/0/1 and HundredGigE 1/0/2 to the VLAN.

   [SwitchB] vlan 100
   [SwitchB-vlan100] port hundredgige 1/0/1 hundredgige 1/0/2
   

   # Enable IGMP snooping for VLAN 100.

   [SwitchB-vlan100] igmp-snooping enable
   [SwitchB-vlan100] quit
   

5. Configure Switch C:

   # Enable the IGMP snooping feature.

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

   # Create VLAN 100, and assign HundredGigE 1/0/1 through HundredGigE 1/0/5 to the VLAN.

   [SwitchC] vlan 100
   [SwitchC-vlan100] port hundredgige 1/0/1 to hundredgige 1/0/5
   

   # Enable IGMP snooping for VLAN 100.

   [SwitchC-vlan100] igmp-snooping enable
   [SwitchC-vlan100] quit
   

   # Configure HundredGigE 1/0/3 and HundredGigE 1/0/5 as static member ports for multicast group 224.1.1.1.

   [SwitchC] interface hundredgige 1/0/3
   [SwitchC-HundredGigE1/0/3] igmp-snooping static-group 224.1.1.1 vlan 100
   [SwitchC-HundredGigE1/0/3] quit
   [SwitchC] interface hundredgige 1/0/5
   [SwitchC-HundredGigE1/0/5] igmp-snooping static-group 224.1.1.1 vlan 100
   [SwitchC-HundredGigE1/0/5] quit
   

# Display static router port information for VLAN 100 on Switch A.

[SwitchA] display igmp-snooping static-router-port vlan 100
VLAN 100:
  Router ports (1 in total):
    HGE1/0/3

The output shows that HundredGigE 1/0/3 on Switch A has become a static router port.

# Display static IGMP snooping group entries for VLAN 100 on Switch C.

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

VLAN 100: Total 1 entries.
  (0.0.0.0, 224.1.1.1)
    Host ports (2 in total):
      HGE1/0/3
      HGE1/0/5

The output shows that HundredGigE 1/0/3 and HundredGigE 1/0/5 on Switch C have become static member ports of multicast group 224.1.1.1.