Example for Implementing Multicast Through a Static Multicast Routed Tunnel

Procedure

1. Configure an IP address for each interface.

   Configure an IP address and mask for each interface as shown in Figure 1.

   • On FW_A:

     # Assign an IP address to GigabitEthernet 0/0/1.

     <FW_A> system-view
     [FW_A] interface GigabitEthernet 0/0/1
     [FW_A-GigabitEthernet0/0/1] ip address 10.1.1.1 24
     [FW_A-GigabitEthernet0/0/1] quit

     # Assign an IP address to GigabitEthernet 0/0/5.

     [FW_A] interface GigabitEthernet 0/0/5
     [FW_A-GigabitEthernet0/0/5] ip address 10.3.1.1 24
     [FW_A-GigabitEthernet0/0/5] quit

   • On FW_B:

     # Assign an IP address to GigabitEthernet 0/0/5.

     <FW_B> system-view
     [FW_B] interface GigabitEthernet 0/0/5
     [FW_B-GigabitEthernet0/0/5] ip address 10.4.1.1 24
     [FW_B-GigabitEthernet0/0/5] quit

     # Assign an IP address to GigabitEthernet 0/0/3.

     [FW_B] interface GigabitEthernet 0/0/7
     [FW_B-GigabitEthernet0/0/3] ip address 10.1.4.1 24
     [FW_B-GigabitEthernet0/0/3] quit

   • On FW_C:

     # Assign an IP address to GigabitEthernet 0/0/1.

     [FW_C] interface GigabitEthernet 0/0/1
     [FW_C-GigabitEthernet0/0/1] ip address 10.1.1.1 24
     [FW_C-GigabitEthernet0/0/1] quit

     # Assign an IP address to GigabitEthernet 0/0/2.

     <FW_C> system-view
     [FW_C] interface GigabitEthernet 0/0/2
     [FW_C-GigabitEthernet0/0/2] ip address 10.2.1.1 24
     [FW_C-GigabitEthernet0/0/2] quit

2. Establish a GRE tunnel between FW_A and FW_B.

   # Configure FW_A.

   [FW_A] interface tunnel 1/0/1

   [FW_A-Tunnel1/0/1] ip address 10.5.1.1 24

   [FW_A-Tunnel1/0/1] tunnel-protocol gre

   [FW_A-Tunnel1/0/1] source 10.1.1.1

   [FW_A-Tunnel1/0/1] destination 10.2.1.2

   [FW_A-Tunnel1/0/1] quit

   # Configure FW_B.

   [FW_B] interface tunnel 1/0/1

   [FW_B-Tunnel1/0/1] ip address 10.5.1.2 24

   [FW_B-Tunnel1/0/1] tunnel-protocol gre

   [FW_B-Tunnel1/0/1] source 10.2.1.2

   [FW_B-Tunnel1/0/1] destination 10.1.1.1

   [FW_B-Tunnel1/0/1] quit

3. Configure OSPF to interconnect FW_A, FW_B, and FW_C.

   # Configure OSPF on FW_A.

   [FW_A] ospf 1

   [FW_A-ospf-1] area 0

   [FW_A-ospf-1-area-0.0.0.0] network 10.3.1.0 0.0.0.255

   [FW_A-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

   [FW_A-ospf-1-area-0.0.0.0] network 10.5.1.1 0.0.0.255

   [FW_A-ospf-1-area-0.0.0.0] quit

   [FW_A-ospf-1] quit

   # Configure OSPF on FW_B.

   [FW_B] ospf 1

   [FW_B-ospf-1] area 0

   [FW_B-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255

   [FW_B-ospf-1-area-0.0.0.0] network 10.4.1.0 0.0.0.255

   [FW_B-ospf-1-area-0.0.0.0] network 10.5.1.2 0.0.0.255

   [FW_B-ospf-1-area-0.0.0.0] quit

   [FW_B-ospf-1] quit

   # Configure OSPF on FW_C.

   [FW_C] ospf 1

   [FW_C-ospf-1] area 0

   [FW_C-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

   [FW_C-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255

   [FW_C-ospf-1-area-0.0.0.0] quit

   [FW_C-ospf-1] quit

4. Enable multicast on FW_A and FW_B and enable PIM-DM on each interface.

   # Enable multicast on FW_A and FW_B, enable PIM-DM on each interface, and enable IGMP on the interface connected to hosts.

   # Configure FW_A.

   [FW_A] multicast routing-enable

   [FW_A] interface GigabitEthernet 0/0/5

   [FW_A-GigabitEthernet0/0/5] pim dm

   [FW_A-GigabitEthernet0/0/5] quit

   [FW_A] interface GigabitEthernet 0/0/1

   [FW_A-GigabitEthernet0/0/1] pim dm

   [FW_A-GigabitEthernet0/0/1] quit

   [FW_A] interface tunnel 1/0/1

   [FW_A-Tunnel1/0/1] pim dm

   [FW_A-Tunnel1/0/1] quit

   # Configure FW_B.

   [FW_B] multicast routing-enable

   [FW_B] interface GigabitEthernet 0/0/3

   [FW_B-GigabitEthernet0/0/3] pim dm

   [FW_B-GigabitEthernet0/0/3] quit

   [FW_B] interface GigabitEthernet 0/0/5

   [FW_B-GigabitEthernet0/0/5] pim dm

   [FW_B-GigabitEthernet0/0/5] igmp enable

   [FW_B-GigabitEthernet0/0/5] quit

   [FW_B] interface tunnel 1/0/1

   [FW_B-Tunnel1/0/1] pim dm

   [FW_B-Tunnel1/0/1] quit

5. Configure a static multicast route.

   Configure a static multicast RPF route on FW_B and specify FW_A as the RPF neighbor.

   [FW_B] ip rpf-route-static 10.3.1.0 255.255.255.0 10.5.1.1

6. Verify the configuration.

   Source 10.3.1.2/24 sends multicast data to G 225.1.1.1. The receiver joins G, and can receive multicast data sent by Source1. Run the display pim routing-table command on FW_B to check the routing table.

   <FW_B> display pim routing-table

   VPN-Instance: public net

    Total 0 (*, G) entry; 1 (S, G) entry

    (10.3.1.2, 225.1.1.1)

        Protocol: pim-dm, Flag: ACT

        UpTime: 00:13:29

        Upstream interface: Tunnel1/0/1

            Upstream neighbor: 10.5.1.1

            RPF prime neighbor: 10.5.1.1

        Downstream interface(s) information:

        Total number of downstreams: 1

            1: GigabitEthernet0/0/5

                  Protocol: pim-dm, UpTime:  - , Expires:  -