Example for Configuring a PIM-SM (ASM Model) Network

Procedure

1. Configure an IP address for each interface and configure the unicast routing protocol.

   # Configure an IP address and mask for each interface according to Figure 4-20. Configure OSPF on each router to ensure IP connectivity between them, and enable them to dynamically update routing information. The configuration of RouterB, RouterC, RouterD, and RouterE are similar to the configuration of RouterA, and are not provided here.

   <Huawei> system-view
   [Huawei] sysname RouterA
   [RouterA] interface gigabitethernet 1/0/0
   [RouterA-GigabitEthernet1/0/0] ip address 192.168.5.1 24
   [RouterA-GigabitEthernet1/0/0] quit
   [RouterA] interface gigabitethernet 2/0/0
   [RouterA-GigabitEthernet2/0/0] ip address 10.110.1.1 24
   [RouterA-GigabitEthernet2/0/0] quit
   [RouterA] interface gigabitethernet 3/0/0
   [RouterA-GigabitEthernet3/0/0] ip address 192.168.1.1 24
   [RouterA-GigabitEthernet3/0/0] quit
   [RouterA] ospf
   [RouterA-ospf-1] area 0
   [RouterA-ospf-1-area-0.0.0.0] network 10.110.1.0 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 192.168.5.0 0.0.0.255
   [RouterA-ospf-1-area-0.0.0.0] quit
   [RouterA-ospf-1] quit

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

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

   [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 connected to user hosts.

   # Enable IGMP on the interface that connects RouterA to user hosts. The configurations of RouterB and RouterC are similar to the configuration of RouterA, and are not mentioned here.

   [RouterA] interface gigabitethernet 2/0/0
   [RouterA-GigabitEthernet2/0/0] igmp enable

4. Enable PIM silent on the interface of RouterA.

   [RouterA] interface gigabitethernet 2/0/0
   [RouterA-GigabitEthernet2/0/0] pim silent

5. Configure the RP.

   The RP can be configured in two modes: the static RP and the dynamic RP. The static RP can be configured together with the dynamic RP. You can also configure only the static RP or the dynamic RP. When the static RP and the dynamic RP are configured simultaneously, you can adjust parameters to specify the preferred RP.

   This example shows how to configure a static RP and a dynamic RP together and to specify the dynamic RP as the preferred RP and the static RP as the standby RP.

   # Configure a dynamic RP. Configure one or more routers in the PIM-SM domain as the C-RP and C-BSR. In this example, RouterE is configured as both the C-RP and C-BSR. Set the service range of the RP and specify the locations of the C-BSR and C-RP on RouterE.

   [RouterE] acl number 2008
   [RouterE-acl-basic-2008] rule permit source 225.1.1.0 0.0.0.255
   [RouterE-acl-basic-2008] quit
   [RouterE] pim
   [RouterE-pim] c-bsr gigabitethernet 4/0/0 
   [RouterE-pim] c-rp gigabitethernet 4/0/0 group-policy 2008

   # Configure a static RP. Specify IP addresses for RPs on all routers. The configuration of RouterA is used as an example. The configurations of RouterB, RouterC, RouterD, and RouterE are similar to the configuration of RouterA, and are not mentioned here.

   If you enter preferred to the right of static-rp X.X.X.X, the static RP is selected as the RP in the PIM-SM domain.

   [RouterA] pim
   [RouterA-pim] static-rp 192.168.2.2

6. Configure the BSR boundary on the interface connecting RouterD to the Internet.

   [RouterD] interface gigabitethernet 2/0/0
   [RouterD-GigabitEthernet2/0/0] pim bsr-boundary
   [RouterD-GigabitEthernet2/0/0] quit

7. Verify the configuration.

   # Run the display pim interface command to view the configuration and running status of PIM on the interface. The PIM configuration on RouterC is as follows:

   <RouterC> display pim interface
   VPN-Instance: public net
   Interface      State   NbrCnt   HelloInt   DR-Pri     DR-Address
   GE1/0/0         up      0         30         1         10.110.2.2    (local)
   GE2/0/0         up      1         30         1         192.168.3.2

   # Run the display pim bsr-info command to view information about BSR election on routers. For example, BSR information on RouterA and RouterE is as follows (C-BSR information is also displayed on RouterE):

   <RouterA> display pim bsr-info
   VPN-Instance: public net
    Elected AdminScoped BSR Count: 0
    Elected BSR Address: 192.168.4.2
        Priority: 0
        Hash mask length: 30
        State: Accept Preferred
        Scope: Not scoped
        Uptime: 01:40:40
        Expires: 00:01:42
        C-RP Count: 1
   
   <RouterE> display pim bsr-info
   VPN-Instance: public net
    Elected AdminScoped BSR Count: 0
    Elected BSR Address: 192.168.4.2
        Priority: 0
        Mask length: 30
        State: Elected
        Scope: Not scoped
        Uptime: 00:00:18
        Next BSR message scheduled at :00:01:42
        C-RP Count: 1
    Candidate AdminScoped BSR Count: 0
    Candidate BSR Address is: 192.168.4.2
        Priority: 0
        Hash mask length: 30
        State:Elected
        Scope: Not scoped   
        Wait to be BSR: 0

   # Run the display pim rp-info command on routers to check RP information. RP information on RouterA is as follows:

   <RouterA> display pim rp-info
   VPN-Instance: public net
    PIM-SM BSR RP Number:1
    Group/MaskLen: 225.1.1.0/24
        RP: 192.168.4.2
        Priority: 0
        Uptime: 00:45:13
        Expires: 00:02:17
    PIM SM static RP Number:1
        Static RP: 192.168.2.2   

   # Run the display pim routing-table command to view the PIM multicast routing table on the routers. The multicast source 10.110.3.100/24 sends messages to the multicast group 225.1.1.1/24. HostA and HostB join the multicast group 225.1.1.1/24. Take RouterA and RouterB as an example. The command output is as follows:

   By default, when the receiver's DR receives the first multicast packet, it triggers an SPT switchover and creates a new (S, G) entry. The (S, G) entry displayed on the router is the (S, G) entry created after the SPT switchover completes.

   [RouterA] display pim routing-table
   VPN-Instance: public net
    Total 1 (*, G) entry; 1 (S, G) entry
    
   (*, 225.1.1.1)
        RP: 192.168.4.2
        Protocol: pim-sm, Flag: WC
        UpTime: 00:13:46
        Upstream interface: GigabitEthernet3/0/0
            Upstream neighbor: 192.168.1.2
            RPF prime neighbor: 192.168.1.2
        Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet2/0/0
                Protocol: igmp, UpTime: 00:13:46, Expires:-
    
   (10.110.3.100, 225.1.1.1)
        RP: 192.168.4.2
        Protocol: pim-sm, Flag: SPT ACT
        UpTime: 00:00:42
        Upstream interface: GigabitEthernet1/0/0
            Upstream neighbor: 192.168.5.2
            RPF prime neighbor: 192.168.5.2
       Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet2/0/0
                Protocol: pim-sm, UpTime: 00:00:42, Expires:-
   [RouterB] display pim routing-table
   VPN-Instance: public net
    Total 1 (*, G) entry; 1 (S, G) entry
    
   (*, 225.1.1.1)
        RP: 192.168.4.2
        Protocol: pim-sm, Flag: WC
        UpTime: 00:10:12
        Upstream interface: GigabitEthernet1/0/0
            Upstream neighbor: 192.168.2.2
            RPF prime neighbor: 192.168.2.2
        Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet2/0/0
                Protocol: igmp, UpTime: 00:10:12, Expires:-
    
   (10.110.3.100, 225.1.1.1)
        RP: 192.168.4.2
        Protocol: pim-sm, Flag: SPT ACT
        UpTime: 00:00:42
        Upstream interface: GigabitEthernet1/0/0
            Upstream neighbor: 192.168.2.2
            RPF prime neighbor: 192.168.2.2
       Downstream interface(s) information:
        Total number of downstreams: 1
            1: GigabitEthernet2/0/0
                Protocol: pim-sm, UpTime: 00:00:30, Expires:-