Example for Configuring MLD Limit

Procedure

1. Configure IPv6 addresses for interfaces and configure an IPv6 unicast routing protocol on the interfaces.

   # Configure an IPv6 address and subnet mask for the interface on each router. Configure Open Shortest Path First Version 3 (OSPFv3) on the routers to implement IP interworking and dynamic route update. The configurations on RouterB, RouterC, and RouterD are similar to those on RouterA and are not mentioned here.

   <Huawei> system-view
   [Huawei] sysname RouterA
   [RouterA] ipv6
   [RouterA] ospfv3 100
   [RouterA-ospfv3-100] router-id 1.1.1.1
   [RouterA-ospfv3-100] quit
   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] ipv6 enable
   [RouterA-GigabitEthernet1/0/0] ipv6 address 3000::12 64
   [RouterA-GigabitEthernet1/0/0] ospfv3 100 area 0
   [RouterA-GigabitEthernet1/0/0] quit
   [RouterA] interface gigabitethernet 2/0/0
   [RouterA-GigabitEthernet2/0/0] ipv6 enable
   [RouterA-GigabitEthernet2/0/0] ipv6 address 2002::1 64
   [RouterA-GigabitEthernet2/0/0] ospfv3 100 area 0
   [RouterA-GigabitEthernet2/0/0] quit

2. Configure the basic IPv6 multicast functions on each router.

   # Enable IPv6 multicast on RouterA and enable IPv6 PIM-SM on all its interfaces. The configurations on RouterB, RouterC, and RouterD are similar to those on RouterA and are not mentioned here.

   [RouterA] multicast ipv6 routing-enable
   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] pim ipv6 sm
   [RouterA-GigabitEthernet1/0/0] quit
   [RouterA] interface gigabitethernet 2/0/0
   [RouterA-GigabitEthernet2/0/0] pim ipv6 sm
   [RouterA-GigabitEthernet2/0/0] quit

   # Configure the rendezvous point (RP). On RouterD, configure GE1/0/0 as a C-BSR and a C-RP.

   [RouterD] pim-ipv6
   [RouterD-pim6] c-bsr 2000::1
   [RouterD-pim6] c-rp 2000::1
   [RouterD-pim6] quit

   # On RouterA, enable MLD on GE1/0/0 connected to the user network segment. The configurations on RouterB and RouterC are similar to those on RouterA and are not mentioned here.

   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] mld enable
   [RouterA-GigabitEthernet1/0/0] quit

3. Configure a static multicast group on GE1/0/0 of RouterA.

   # Configure static multicast group at FF16::1 on GE1/0/0 of RouterA so that receiver hosts connected to GE1/0/0 can stably receive multicast data sent to multicast group FF16::1.

   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] mld static-group FF16::1
   [RouterA-GigabitEthernet1/0/0] quit
   

4. Set the maximum number of MLD groups on the last-hop router. The configurations on RouterB and RouterC are similar to those on RouterA and are not mentioned here.

   # Set the maximum number of MLD entries on RouterA to 50.

   [RouterA] mld global limit 50
   

   # Set the maximum number of MLD entries on GE1/0/0 of RouterA to 30.

   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] mld limit 30 
   [RouterA-GigabitEthernet1/0/0] quit
   

5. Verify the configuration.

   # Run the display mld interface command to check the MLD configuration and running status on each interface of the router. MLD information on GE1/0/0 of RouterA is as follows:

   <RouterA> display mld interface gigabitethernet 1/0/0
   Interface information
    GigabitEthernet1/0/0(FE80::200:5EFF:FE66:5100):
      MLD is enabled
      Current MLD version is 2
      MLD state: up 
      MLD group policy: none
      MLD limit: 30
      Value of query interval for MLD (negotiated): 125 s
      Value of query interval for MLD (configured): 125 s
      Value of other querier timeout for MLD: 0 s
      Value of maximum query response time for MLD: 10 s 
      Querier for MLD: FE80::200:5EFF:FE66:5100 (this router)
     Total 1 MLD Group reported 
   
   

   The command output shows that a maximum of 30 MLD entries can be created on GE1/0/0 of RouterA.

   # Run the display mld group interface gigabitethernet 1/0/0 static verbose command to check detailed information about the interface on which a static multicast group is configured.

   <RouterA> display mld group interface gigabitethernet 1/0/0 static verbose
   Static join group information
    Total 1 entry
     00001.(*, FF16::1)
         1.GigabitEthernet1/0/0
             State:             UP
             Reference Count:   1
             Multicast Boundary:NO
             Outgoing Interface:NO
   
   

   The command output shows that static multicast group FF16::1 is configured on GE1/0/0 of RouterA.

   # Run the display pim ipv6 routing-table command to check the IPv6 PIM-SM multicast routing table on each router.

   <RouterA> display pim ipv6 routing-table
    VPN-Instance: public net
    Total 1 (*, G) entry; 1 (S, G) entry 
   
    (*, FF16::1)
        RP: 2000::1
        Protocol: pim-sm, Flag: WC
        UpTime: 00:21:35 
        Upstream interface: GigabitEthernet2/0/0
            Upstream neighbor: FE80::7A1D:BAFF:FECD:909D
            RPF prime neighbor: FE80::7A1D:BAFF:FECD:909D
        Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet1/0/0 
                Protocol: static mld, UpTime: 00:21:35, Expires: - 
   
    (2003::5, FF16::1) 
        RP: 2000::1
        Protocol: pim-sm, Flag: SPT ACT
        UpTime: 00:42:46
        Upstream interface: GigabitEthernet2/0/0
            Upstream neighbor: FE80::7A1D:BAFF:FECD:909D
            RPF prime neighbor: FE80::7A1D:BAFF:FECD:909D
        Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet1/0/0
                Protocol: pim-sm, UpTime: 00:21:35, Expires: -
   
   

   The command output shows that (*, FF16::1) and (2003::5, FF16::1) entries exist on RouterA, indicating that GE1/0/0 has joined group FF16::1, and can receive the multicast data sent from multicast source 2003::5 to group FF16::1.