Static port configuration example

As shown in Figure 45:

• Router A runs MLDv1 and acts as the MLD querier. Switch A, Switch B, and Switch C run MLDv1 snooping.

• Host A and Host C are permanent receivers of IPv6 multicast group FF1E::101.

Configure static ports to meet the following requirements:

• To enhance the reliability of IPv6 multicast traffic transmission, configure FortyGigE 1/0/3 and FortyGigE 1/0/5 on Switch C as static member ports for IPv6 multicast group FF1E::101.

• Suppose the STP runs on the network. To avoid data loops, the forwarding path from Switch A to Switch C is blocked under normal conditions. IPv6 multicast data flows to the receivers attached to Switch C only along the path of Switch A—Switch B—Switch C. Configure FortyGigE 1/0/3 on Switch A as a static router port, so that IPv6 multicast data can flow to the receivers nearly uninterrupted along the path of Switch A—Switch C when the path of Switch A—Switch B—Switch C is blocked.

	NOTE: If no static router port is configured, IPv6 multicast transmission is interrupted for a while after the path of Switch A—Switch B—Switch C is blocked. The reason is that at least one MLD query/response exchange is required before the new path can forward IPv6 multicast packets.

For more information about the STP, see Layer 2—LAN Switching Configuration Guide.

1. Assign an IPv6 address and prefix length to each interface according to Figure 45. (Details not shown.)

2. Configure Router A:

   # Enable IPv6 multicast routing.

   <RouterA> system-view
   [RouterA] ipv6 multicast routing
   [RouterA-mrib6] quit
   

   # Enable MLD on FortyGigE 1/0/1.

   [RouterA] interface fortygige 1/0/1
   [RouterA-FortyGigE1/0/1] mld enable
   [RouterA-FortyGigE1/0/1] quit
   

   # Enable IPv6 PIM-DM on FortyGigE 1/0/2.

   [RouterA] interface fortygige 1/0/2
   [RouterA-FortyGigE1/0/2] ipv6 pim dm
   [RouterA-FortyGigE1/0/2] quit
   

3. Configure Switch A:

   # Enable MLD snooping globally.

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

   # Create VLAN 100, and assign FortyGigE 1/0/1 through FortyGigE 1/0/3 to the VLAN.

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

   # Enable MLD snooping for VLAN 100.

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

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

   [SwitchA] interface fortygige 1/0/3
   [SwitchA-FortyGigE1/0/3] mld-snooping static-router-port vlan 100
   [SwitchA-FortyGigE1/0/3] quit
   

4. Configure Switch B:

   # Enable MLD snooping globally.

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

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

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

   # Enable MLD snooping for VLAN 100.

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

5. Configure Switch C:

   # Enable MLD snooping globally.

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

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

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

   # Enable MLD snooping for VLAN 100.

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

   # Configure FortyGigE 1/0/3 and FortyGigE 1/0/5 as static member ports for IPv6 multicast group FF1E::101.

   [SwitchC] interface fortygige 1/0/3
   [SwitchC-FortyGigE1/0/3] mld-snooping static-group ff1e::101 vlan 100
   [SwitchC-FortyGigE1/0/3] quit
   [SwitchC] interface fortygige 1/0/5
   [SwitchC-FortyGigE1/0/5] mld-snooping static-group ff1e::101 vlan 100
   [SwitchC-FortyGigE1/0/5] quit
   

# Display information about the static router ports in VLAN 100 on Switch A.

[SwitchA] display mld-snooping static-router-port vlan 100
VLAN 100:
  Router slots (1 in total):
    1
  Router ports (1 in total):
    FGE1/0/3

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

# Display static MLD snooping forwarding entries in VLAN 100 on Switch C.

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

VLAN 100: Total 1 entries).
  (::, FF1E::101)
    Host slots (0 in total):
    Host ports (2 in total):
      FGE1/0/3
      FGE1/0/5

The output shows that FortyGigE 1/0/3 and FortyGigE 1/0/5 on Switch C have become static member ports of IPv6 multicast group FF1E::101.