Example for Configuring MLD SSM Mapping

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 2001::2 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 3001::1 64
   [RouterA-GigabitEthernet2/0/0] ospfv3 100 area 0
   [RouterA-GigabitEthernet2/0/0] quit
   [RouterA] interface gigabitethernet 3/0/0
   [RouterA-GigabitEthernet3/0/0] ipv6 enable
   [RouterA-GigabitEthernet3/0/0] ipv6 address 3003::1 64
   [RouterA-GigabitEthernet3/0/0] ospfv3 100 area 0
   [RouterA-GigabitEthernet3/0/0] 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
   [RouterA] interface gigabitethernet 3/0/0
   [RouterA-GigabitEthernet3/0/0] pim ipv6 sm
   [RouterA-GigabitEthernet3/0/0] quit
   

   # On RouterD, enable MLDv2 on GE1/0/0.

   [RouterD] interface gigabitethernet 1/0/0
   [RouterD-GigabitEthernet1/0/0] mld enable
   [RouterD-GigabitEthernet1/0/0] mld version 2
   [RouterD-GigabitEthernet1/0/0] quit
   

3. Configure MLD SSM mapping and mapping rules.

   # Set the range of SSM group addresses to FF3E::/64 on all routers. The configurations on RouterB, RouterC, and RouterD are similar to those on RouterA and are not mentioned here.

   [RouterA] acl ipv6 number 2000
   [RouterA-acl6-basic-2000] rule permit source ff3e::/64
   [RouterA-acl6-basic-2000] quit
   [RouterA] pim-ipv6
   [RouterA-pim6] ssm-policy 2000
   [RouterA-pim6] quit
   

   # On RouterD, enable MLD SSM mapping on GE1/0/0.

   [RouterD] interface gigabitethernet 1/0/0
   [RouterD-GigabitEthernet1/0/0] mld ssm-mapping enable
   [RouterD-GigabitEthernet1/0/0] quit
   

   # On RouterD, map multicast groups within the range of FF3E::/64 to Source1 and Source3.

   [RouterD] mld
   [RouterD-mld] ssm-mapping ff3e:: 64 2001::1
   [RouterD-mld] ssm-mapping ff3e:: 64 2003::1
   [RouterD-mld] quit
   

4. Verify the configuration.

   # Run the display mld ssm-mapping group command on RouterD to check mapping between multicast sources and multicast group addresses.

   <RouterD> display mld ssm-mapping group
   MLD SSM-Mapping conversion table
    Group: FF3E::/64 
     Number of Source(s): 2
        2001::1
        2003::1
   
   

   The command output shows that multicast groups within the range of FF3E::/64 are mapped to Source1 and Source3.

   # Run the display mld group ssm-mapping verbose command to check detailed information about all multicast group entries established with SSM mapping.

   <RouterD> display mld group ssm-mapping verbose
   Total entry on this router: 1
   Interface group report information of VPN-Instance: public net
    Limited entry of this VPN-Instance: - 
    GigabitEthernet1/0/0(FE80::4E1F:CCFF:FE47:C8A0):
     Total entry on this interface: 1 
     Limited entry on this interface: - 
     Total 1 MLD SSM-Mapping Group reported
      Group: FF3E::1
        Uptime: 00:53:02
        Expires: 00:04:20
        Last reporter: 2004::1
        Last-listener-query-counter: 0
        Last-listener-query-timer-expiry: off
        Group mode: exclude
        Version1-host-present-timer-expiry: 00:04:20
   
   

   The command output shows that Receiver has joined multicast group with the address of FF3E::1.

   # Run the display pim ipv6 routing-table command to check the IPv6 PIM-SM multicast routing table on each router. The multicast routing table on RouterD is as follows:

   <RouterD> display pim ipv6 routing-table
   VPN-Instance: public net
    Total 2 (S, G) entries
   
    (2001::1, FF3E::1)
        Protocol: pim-ssm, Flag: SG_RCVR
        UpTime: 01:23:43
        Upstream interface: GigabitEthernet3/0/0
            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: ssm-map, UpTime: 01:23:43, Expires: - 
   
    (2003::1, FF3E::1) 
        Protocol: pim-ssm, Flag: SG_RCVR
        UpTime: 01:23:43 
        Upstream interface: GigabitEthernet2/0/0
            Upstream neighbor: FE80::A01:100:1
            RPF prime neighbor: FE80::A01:100:1
        Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet1/0/0
                Protocol: ssm-map, UpTime: 01:23:43, Expires: - 
   
   

   The command output shows that (2001::1, FF3E::1) and (2003::1, FF3E::1) entries exist on RouterD and the protocol type is ssm-map, indicating that GE1/0/0 has joined the multicast group with the address of FF3E::1 using SSM mapping. After multicast sources 2001::1 and 2003::1 send multicast data to FF3E::1, RouterD receives the multicast data from the two multicast sources through GE3/0/0 and GE2/0/0 respectively.