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Example for Connecting the RPF Route Through a Static Multicast Route

After a static multicast route is configured in the multicast network, a receiver can receive multicast data from a multicast source in another area that is unreachable with unicast routes.

Networking Requirements

As shown in Figure 1, the network runs PIM-DM, all FWs support multicast, and receiver can receive information from the multicast source Source1. FW_B and FW_C run OSPF. There is no unicast route between FW_A and FW_B. It is required to use a multicast static route to enable the receiver to receive information sent by Source2.

Figure 1 Networking diagram for connecting the RPF route through static multicast routes

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure an IP address and OSPF on each interface.

  2. Enable multicast on each FW, PIM-DM on each interface, and IGMP on the interface connected to hosts.

  3. Configure a static multicast Reverse Path Forwarding (RPF) route between FW_B and FW_C.

Procedure

  1. Configure an IP address and a unicast routing protocol on each FW.

    As shown in Figure 1, configure IP addresses and masks of the interfaces on each FW. FW_B and FW_C belong to the same OSPF area, and the two FWs are able to update routes among them through the unicast routing protocol.

    • On FW_A:

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

      <FW_A> system-view
[FW_A] interface GigabitEthernet 0/0/5
[FW_A-GigabitEthernet0/0/5] ip address 10.1.5.1 24
[FW_A-GigabitEthernet0/0/5] quit

      # Assign an IP address to GigabitEthernet 0/0/7.

      [FW_A] interface GigabitEthernet 0/0/7
[FW_A-GigabitEthernet0/0/7] ip address 10.1.4.2 24
[FW_A-GigabitEthernet0/0/7] 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 10.1.2.2 24
[FW_B-GigabitEthernet0/0/5] quit

      # Assign an IP address to GigabitEthernet 0/0/6.

      [FW_B] interface GigabitEthernet 0/0/6
[FW_B-GigabitEthernet0/0/6] ip address 10.1.3.1 24
[FW_B-GigabitEthernet0/0/6] quit

      # Assign an IP address to GigabitEthernet 0/0/7.

      [FW_B] interface GigabitEthernet 0/0/7
[FW_B-GigabitEthernet0/0/5] ip address 10.1.4.1 24
[FW_B-GigabitEthernet0/0/5] quit

      # Configure OSPF.

      [FW_B] router id 2.2.2.2
[FW_B] ospf 1
[FW_B-ospf-1] area 0
[FW_B-ospf-1-area-0.0.0.0] network 10.1.2.0 0.0.0.255
[FW_B-ospf-1-area-0.0.0.0] network 10.1.3.0 0.0.0.255
[FW_B-ospf-1-area-0.0.0.0] network 10.1.4.0 0.0.0.255
[FW_B-ospf-1-area-0.0.0.0] quit
[FW_B-ospf-1] quit

    • On FW_C:

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

      [FW_C] interface GigabitEthernet 0/0/5
[FW_C-GigabitEthernet0/0/5] ip address 10.1.2.1 24
[FW_C-GigabitEthernet0/0/5] quit

      # Assign an IP address to GigabitEthernet 0/0/6.

      <FW_C> system-view
[FW_C] interface GigabitEthernet 0/0/6
[FW_C-GigabitEthernet0/0/6] ip address 10.1.1.1 24
[FW_C-GigabitEthernet0/0/6] quit

      # Configure OSPF.

      [FW_C] router id 2.2.2.2
[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 10.1.2.0 0.0.0.255
[FW_C-ospf-1-area-0.0.0.0] quit
[FW_C-ospf-1] quit

  2. Enable multicast on each FW and PIM-DM on each interface

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

    [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 0/0/7
    [FW_A-GigabitEthernet0/0/7] pim dm
    

    [FW_B] multicast routing-enable
    

    [FW_B] interface GigabitEthernet 0/0/5
    

    [FW_B-GigabitEthernet0/0/5] pim dm
    

    [FW_B-GigabitEthernet0/0/5] quit
    

    [FW_B] interface GigabitEthernet 0/0/6
    

    [FW_B-GigabitEthernet0/0/6] pim dm
    

    [FW_B-GigabitEthernet0/0/6] quit
    

    [FW_B] interface GigabitEthernet 0/0/7
    

    [FW_B-GigabitEthernet0/0/7] pim dm
    

    [FW_B-GigabitEthernet0/0/7] quit
    

    

    [FW_C] multicast routing-enable
    

    [FW_C] interface GigabitEthernet 0/0/5
    

    [FW_C-GigabitEthernet0/0/5] pim dm
    

    [FW_C-GigabitEthernet0/0/5] quit
    

    [FW_C] interface GigabitEthernet 0/0/6
    

    [FW_C-GigabitEthernet0/0/6] pim dm
    

    [FW_C-GigabitEthernet0/0/6] igmp enable
    

    [FW_C-GigabitEthernet0/0/6] quit
    

    # Source 1 (10.1.3.2/24) and Source 2 (10.1.5.2/24)
send multicast data to the multicast group G (225.1.1.1). The receiver
joins G. The receiver can then receive the multicast data sent by
Source 1, but cannot receive the multicast data sent by Source 2.
    

    # Run the display multicast rpf-info 10.1.5.2 command on FW_B and FW_C. If there is
no display, it indicates that FW_B and FW_C have no RPF
route to Source 2.
    

    

    3. 

  3. Configure a static multicast route

    # Configure a static multicast RPF route on FW_B and configure FW_A as the RPF neighbor
to Source 2.
    

    [FW_B] ip rpf-route-static 10.1.5.0 255.255.255.0 10.1.4.2
    

    # Configure a static multicast RPF route on FW_C, and configure FW_B as the RPF neighbor
to Source 2.
    

    [FW_C] ip rpf-route-static 10.1.5.0 255.255.255.0 10.1.2.2
    

    

    4. 

  4. Verify the configuration

    # Run the display multicast rpf-info 10.1.5.2 command
on FW_B and FW_C to view the
RPF information of Source 2. The display information of RPF is as
follows:
    

    <FW_B> display multicast rpf-info 10.1.5.2
    

    VPN-Instance: public net
    

    RPF information about source: 10.1.5.2
    

         RPF interface: GigabitEthernet0/0/7, RPF neighbor: 10.1.4.2
    

         Referenced route/mask: 10.1.5.0/24
    

         Referenced route type: mstatic
    

         Route selecting rule: preference-preferred
     Load splitting rule: disabled

    

    

    <FW_C> display multicast rpf-info 10.1.5.2
    

    VPN-Instance: public net
    

    RPF information about source: 10.1.5.2
    

         RPF interface: GigabitEthernet0/0/5, RPF neighbor: 10.1.2.2
    

         Referenced route/mask: 10.1.5.0/24
    

         Referenced route type: mstatic
    

         Route selection rule: preference-preferred
     Load splitting rule: disabled

    

    # Run the display pim routing-table command to
view the routing table. FW_C has the multicast entry of Source 2. The receiver can receive
the multicast data from Source 2.
    

    <FW_C> display pim routing-table
    

    VPN-Instance: public net
    

     Total 1 (*, G) entry; 2 (S, G) entries
    

    

     (*, 225.1.1.1)
    

         Protocol: pim-dm, Flag: WC
    

         UpTime: 03:54:19
    

         Upstream interface: NULL
    

             Upstream neighbor: NULL
    

             RPF prime neighbor: NULL
    

         Downstream interface(s) information:
    

         Total number of downstreams: 1
    

             1: GigabitEthernet0/0/6
    

                 Protocol: pim-dm, UpTime: 01:38:19, Expires: never
    

    

    (10.1.3.2, 225.1.1.1)     
    

         Protocol: pim-dm, Flag: ACT
    

         UpTime: 00:00:44
    

         Upstream interface: GigabitEthernet0/0/5
    

             Upstream neighbor: 10.1.2.2
    

             RPF prime neighbor: 10.1.2.2
    

         Downstream interface(s) information:
    

         Total number of downstreams: 1
    

              1: GigabitEthernet0/0/6
    

                  Protocol: pim-dm, UpTime: 00:00:44, Expires: never  
    

    

    (10.1.5.2, 225.1.1.1)     
    

         Protocol: pim-dm, Flag: ACT
    

         UpTime: 00:00:44
    

         Upstream interface: GigabitEthernet0/0/5
    

             Upstream neighbor: 10.1.2.2
    

             RPF prime neighbor: 10.1.2.2
    

         Downstream interface(s) information:
    

         Total number of downstreams: 1
    

              1: GigabitEthernet0/0/6
    

                  Protocol: pim-dm, UpTime: 00:00:44, Expires: never  
    

    

    5. 




Configuration Scripts
  • Configuration script of FW_A
    

    #
    

     sysname FW_A
    

    #
    

     multicast routing-enable
    

    #
    

    interface GigabitEthernet0/0/5
    

     ip address 10.1.5.1 255.255.255.0
    

     pim dm
    

    #
    

    interface GigabitEthernet0/0/7
    

     ip address 10.1.4.2 255.255.255.0
    

     pim dm
    

    #
    

    ospf 1
    

     area 0.0.0.0
    

      network 10.1.5.0 0.0.0.255
    

      network 10.1.4.0 0.0.0.255
    

    #
    

    return 
    

  • Configuration script of FW_B
    

    #
    

     sysname FW_B
    

    #
    

     multicast routing-enable
    

    #
    

    interface GigabitEthernet0/0/5
    

     ip address 10.1.2.2 255.255.255.0
    

     pim dm
    

    #
    

    interface GigabitEthernet0/0/6
    

     ip address 10.1.3.1 255.255.255.0
    

     pim dm
    

    #
    

    interface GigabitEthernet0/0/7
    

     ip address 10.1.4.1 255.255.255.0
    

     pim dm
    

    #
    

    ospf 1
    

     area 0.0.0.0
    

      network 10.1.2.0 0.0.0.255
    

      network 10.1.3.0 0.0.0.255
    

    #
    

    ip rpf-route-static 10.1.5.0 24 10.1.4.2
    

    #
    

    return 
    

  • Configuration script of FW_C
    

    #
    

     sysname FW_C
    

    #
    

     multicast routing-enable
    

    #
    

    interface GigabitEthernet0/0/5
    

     ip address 10.1.2.1 255.255.255.0
    

     pim dm
    

    #
    

    interface GigabitEthernet0/0/6
    

     ip address 10.1.1.1 255.255.255.0
    

     igmp enable
    

     pim dm
    

    #
    

    ospf 1
    

     area 0.0.0.0
    

      network 10.1.1.0 0.0.0.255
    

      network 10.1.2.0 0.0.0.255
    

    #
    

    ip rpf-route-static 10.1.5.0 24 10.1.2.2
    

    #
    

    return 
    
















Parent Topic:
Configuration Examples for IPv4 Multicast Routing Management





Copyright © Huawei Technologies Co., Ltd.



Copyright © Huawei Technologies Co., Ltd.



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