Example for Configuring IGMP SSM Mapping

Procedure

1. Configure IP addresses for interfaces and configure a unicast routing protocol on each Router.

   # Configure IP addresses and masks for router interfaces according to Figure 2-20. Configure Open Shortest Path First (OSPF) on the routers to implement IP interworking and dynamic route update. The configurations of RouterB, RouterC, and RouterD are similar to the configuration of RouterA, and are not mentioned here. See Configuration Files.

   <Huawei> system-view
   [Huawei] sysname RouterA
   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] ip address 10.10.1.2 24
   [RouterA-GigabitEthernet1/0/0] quit
   [RouterA] interface gigabitethernet 2/0/0
   [RouterA-GigabitEthernet2/0/0] ip address 192.168.1.1 24
   [RouterA-GigabitEthernet2/0/0] quit
   [RouterA] interface gigabitethernet 3/0/0
   [RouterA-GigabitEthernet3/0/0] ip address 192.168.4.2 24
   [RouterA-GigabitEthernet3/0/0] quit
   [RouterA] ospf
   [RouterA-ospf-1] area 0
   [RouterA-ospf-1-area-0.0.0.0] network 10.10.1.0 0.0.0.255
   [RouterA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
   [RouterA-ospf-1-area-0.0.0.0] network 192.168.4.0 0.0.0.255
   [RouterA-ospf-1-area-0.0.0.0] quit
   [RouterA-ospf-1] quit

2. Enable IP multicast routing on all the routers and enable PIM-SM on all interfaces.

   # Enable IP multicast routing on RouterA and enable PIM-SM on all its interfaces. The configurations of RouterB, RouterC, and RouterD are similar to the configuration of RouterA, and are not mentioned here. See Configuration Files.

   [RouterA] multicast routing-enable
   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] pim sm
   [RouterA-GigabitEthernet1/0/0] quit
   [RouterA] interface gigabitethernet 2/0/0
   [RouterA-GigabitEthernet2/0/0] pim sm
   [RouterA-GigabitEthernet2/0/0] quit
   [RouterA] interface gigabitethernet 3/0/0
   [RouterA-GigabitEthernet3/0/0] pim sm
   [RouterA-GigabitEthernet3/0/0] quit

3. Enable IGMP on the interface of RouterD connected to Receiver and set the IGMP version to IGMPv3.

   # Enable IGMP on GE1/0/0 of RouterD and set the IGMP version to IGMPv3.

   [RouterD] interface gigabitethernet 1/0/0
   [RouterD-GigabitEthernet1/0/0] igmp enable
   [RouterD-GigabitEthernet1/0/0] igmp version 3
   [RouterD-GigabitEthernet1/0/0] quit

4. Enable IGMP SSM mapping on the interface connected to Receiver.

   # Enable SSM mapping on GE1/0/0 of RouterD.

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

5. Configure the SSM group address range on all routers.

   # Set the SSM group address range to 232.1.1.0/24 on RouterA. The configurations of RouterB, RouterC, and RouterD are similar to the configuration of RouterA, and are not mentioned here. See Configuration Files.

   [RouterA] acl number 2000
   [RouterA-acl-basic-2000] rule permit source 232.1.1.0 0.0.0.255
   [RouterA-acl-basic-2000] quit
   [RouterA] pim
   [RouterA-pim] ssm-policy 2000
   [RouterA-pim] quit

6. Configure IGMP SSM mapping rules on RouterD.

   # On RouterD, map the multicast groups in the range of 232.1.1.0/24 to Source1 and Source3.

   [RouterD] igmp
   [RouterD-igmp] ssm-mapping 232.1.1.0 24 10.10.1.1
   [RouterD-igmp] ssm-mapping 232.1.1.0 24 10.10.3.1
   [RouterD-igmp] quit

7. Verify the configuration.

   # Run the display igmp ssm-mapping group command on RouterD to view the mappings between multicast sources and multicast groups.

   <RouterD> display igmp ssm-mapping group
   IGMP SSM-Mapping conversion table of VPN-Instance: public net
    Total 2 entries    2 entries matched
   
    00001. (10.10.1.1, 232.1.1.0/24)
   
    00002. (10.10.3.1, 232.1.1.0/24)
   
    Total 2 entries matched
   

   The preceding information shows that multicast groups in the range of 232.1.1.0/24 are mapped to Source1 and Source3.

   # Run the display igmp group ssm-mapping command on RouterD to view information about the group address used in SSM mapping. The command output is as follows:

   <RouterD> display igmp group ssm-mapping
   
   IGMP SSM mapping interface group report information of VPN-Instance: public net
   
    Limited entry of this VPN-Instance: - 
    GigabitEthernet1/0/0(10.10.4.2):
     Total 1 IGMP SSM-Mapping Group reported
      Group Address   Last Reporter   Uptime      Expires
      232.1.1.1       10.10.4.1       00:01:44    00:00:26
   
   

   The preceding information shows that Receiver has joined group 232.1.1.1.

   # Run the display pim routing-table command on RouterD to view the PIM-SM multicast routing table. The command output is as follows:

   <RouterD> display pim routing-table
   VPN-Instance: public net
    Total 2 (S, G) entries
   
    (10.10.1.1, 232.1.1.1)
        Protocol: pim-ssm, Flag: SG_RCVR
        UpTime: 00:19:40
        Upstream interface: GigabitEthernet3/0/0
            Upstream neighbor: 192.168.4.2
            RPF prime neighbor: 192.168.4.2
        Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet1/0/0
                Protocol: ssm-map, UpTime: 00:19:40, Expires: - 
   
    (10.10.3.1, 232.1.1.1)
        Protocol: pim-ssm, Flag: SG_RCVR
        UpTime: 00:19:40
        Upstream interface: GigabitEthernet2/0/0
            Upstream neighbor: 192.168.3.1
            RPF prime neighbor: 192.168.3.1
        Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet1/0/0
                Protocol: ssm-map, UpTime: 00:19:40, Expires: - 
   

   You can see that multicast sources 10.10.1.1 and 10.10.3.1 send data to group 232.1.1.1, and RouterD receives the multicast data from the two multicast sources through interfaces GE3/0/0 and GE2/0/0 respectively.