Example for Configuring Basic PIM-DM Functions

Procedure

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

   # Enable multicast on FW_A and enable PIM-DM on each interface. The configuration procedures on FW_B, FW_C, and FW_D are similar to those on FW_A, and are not mentioned here.

   [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

2. Enable PIM silent on the interface connected to hosts, and configure IGMP on the interface.

   # On FW_A, enable PIM silent on the interface connected to hosts, and configure IGMP on the interface.

   [FW_A] interface GigabitEthernet 0/0/5

   [FW_A-GigabitEthernet0/0/5] pim silent

   [FW_A-GigabitEthernet0/0/5] igmp enable

   [FW_A-GigabitEthernet0/0/5] quit

   # On FW_B, configure IGMP on the interface. The configurations of FW_C are the same as that of FW_B, and are not mentioned here.

   [FW_B] interface GigabitEthernet 0/0/5

   [FW_B-GigabitEthernet0/0/5] igmp enable

   [FW_B-GigabitEthernet0/0/5] quit

3. Verify the configuration.

   # Run the display pim interface command to view the configuration and the running of PIM on the interface of the FW. Take the PIM configuration on FW_D as an example:

   <FW_D> display pim interface

   VPN-Instance: public net

   Interface      State   NbrCnt   HelloInt   DR-Pri     DR-Address

   GE0/0/4        up      0        30         1          10.110.5.1

   GE0/0/3        up      1        30         1          192.168.1.2

   GE0/0/1        up      1        30         1          192.168.2.2

   GE0/0/2        up      1        30         1          192.168.3.2

   # Run the display pim neighbor command to view the PIM neighbor relationship between FWs. Take the PIM neighbor relationship on FW_D as an example:

   <FW_D> display pim neighbor

    VPN-Instance: public net

    Total Number of Neighbors = 3 

    Neighbor        Interface         Uptime       Expires      Dr-Priority   BFD-Session

    192.168.1.1     GE0/0/3           00:02:22     00:01:27     1             N         

    192.168.2.1     GE0/0/1           00:00:22     00:01:29     1             N         

    192.168.3.1     GE0/0/2           00:00:23     00:01:31     1             N          

   # Run the display pim routing-table command, and you can view the PIM routing table. Assume that Host A requests the information of group G (225.1.1.1). After multicast source S (10.110.5.100) sends multicast packets to multicast group G (255.1.1.1), the MDT (Multicast Distribution Tree) is established by means of flooding. All PIM multicast FWs (including FW_A and FW_D) on the MDT have the (S, G) entry. Host A joins G, and FW_A generates an (*, G) entry. The display information on FW_B and FW_C is similar to that on FW_A.

   <FW_A> display pim routing-table

   VPN-Instance: public net

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

    (*, 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: GigabitEthernet0/0/5

                Protocol: igmp, UpTime: 01:38:19, Expires: never

   (10.110.5.100, 225.1.1.1)     

        Protocol: pim-dm, Flag: ACT

        UpTime: 00:00:44

        Upstream interface: GigabitEthernet0/0/1

            Upstream neighbor: 192.168.1.2

            RPF prime neighbor: 192.168.1.2

        Downstream interface(s) information:

        Total number of downstreams: 1

             1: GigabitEthernet0/0/5

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

   <FW_D> display pim routing-table

   VPN-Instance: public net

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

    (10.110.5.100, 225.1.1.1)

        Protocol: pim-dm, Flag: LOC ACT

        UpTime: 01:35:25

        Upstream interface: GigabitEthernet0/0/4

            Upstream neighbor: NULL

            RPF prime neighbor: NULL

        Downstream interface(s) information:

        Total number of downstreams: 3

           1: GigabitEthernet0/0/3

               Protocol: pim-dm, UpTime: 00:03:27, Expires: never

           2: GigabitEthernet0/0/1

               Protocol: pim-dm, UpTime: 00:03:27, Expires: never

           3: GigabitEthernet0/0/2

               Protocol: pim-dm, UpTime: 00:03:27, Expires: never