Example: Configuring PIM-DM

As shown in Figure 55:

• OSPF runs on the network.

• VOD streams are sent to receiver hosts in multicast. The receiver groups of different organizations form stub networks, and one or more receiver hosts exist on each stub network.

• The entire PIM domain operates in the dense mode.

• Host A and Host C are multicast receivers on two stub networks.

• IGMPv2 runs between Switch A and N1, and between Switch B, Switch C, and N2.

1. Assign an IP address and subnet mask for each interface, as shown in Figure 55. (Details not shown.)

2. Configure OSPF on the switches in the PIM-DM domain. (Details not shown.)

3. Enable IP multicast routing, IGMP, and PIM-DM:

   # On Switch A, enable IP multicast routing.

   <SwitchA> system-view
   [SwitchA] multicast routing
   [SwitchA-mrib] quit
   

   # Enable IGMP on VLAN-interface 100 (the interface that connects to the stub network).

   [SwitchA] interface vlan-interface 100
   [SwitchA-Vlan-interface100] igmp enable
   [SwitchA-Vlan-interface100] quit
   

   # Enable PIM-DM on VLAN-interface 103.

   [SwitchA] interface vlan-interface 103
   [SwitchA-Vlan-interface103] pim dm
   [SwitchA-Vlan-interface103] quit
   

   # Enable IP multicast routing, IGMP, and PIM-DM on Switch B and Switch C in the same way Switch A is configured. (Details not shown.)

   # On Switch D, enable IP multicast routing, and enable PIM-DM on each interface.

   <SwitchD> system-view
   [SwitchD] multicast routing
   [SwitchD-mrib] quit
   [SwitchD] interface vlan-interface 300
   [SwitchD-Vlan-interface300] pim dm
   [SwitchD-Vlan-interface300] quit
   [SwitchD] interface vlan-interface 103
   [SwitchD-Vlan-interface103] pim dm
   [SwitchD-Vlan-interface103] quit
   [SwitchD] interface vlan-interface 101
   [SwitchD-Vlan-interface101] pim dm
   [SwitchD-Vlan-interface101] quit
   [SwitchD] interface vlan-interface 102
   [SwitchD-Vlan-interface102] pim dm
   [SwitchD-Vlan-interface102] quit
   

# Display PIM information on Switch D.

[SwitchD] display pim interface
 Interface           NbrCnt HelloInt   DR-Pri     DR-Address
 Vlan300             0      30         1          10.110.5.1     (local)
 Vlan103             1      30         1          192.168.1.2    (local)
 Vlan101             1      30         1          192.168.2.2    (local)
 Vlan102             1      30         1          192.168.3.2    (local)

# Display PIM neighboring relationships on Switch D.

[SwitchD] display pim neighbor
 Total Number of Neighbors = 3

 Neighbor        Interface           Uptime   Expires  Dr-Priority Mode
 192.168.1.1     Vlan103             00:02:22 00:01:27 1
 192.168.2.1     Vlan101             00:00:22 00:01:29 3
 192.168.3.1     Vlan102             00:00:23 00:01:31 5

# Send an IGMP report from Host A to join multicast group 225.1.1.1. (Details not shown.)

# Send multicast data from multicast source 10.110.5.100/24 to multicast group 225.1.1.1. (Details not shown.)

# Display PIM routing entries on Switch A.

[SwitchA] display pim routing-table
 Total 1 (*, G) entry; 1 (S, G) entry

 (*, 225.1.1.1)
     Protocol: pim-dm, Flag: WC
     UpTime: 00:04:25
     Upstream interface: NULL
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: Vlan-interface100
             Protocol: igmp, UpTime: 00:04:25, Expires: -

 (10.110.5.100, 225.1.1.1)
     Protocol: pim-dm, Flag: ACT
     UpTime: 00:06:14
     Upstream interface: Vlan-interface103
         Upstream neighbor: 192.168.1.2
         RPF prime neighbor: 192.168.1.2
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: Vlan-interface100
             Protocol: pim-dm, UpTime: 00:04:25, Expires: -

# Display PIM routing entries on Switch D.

[SwitchD] display pim routing-table
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.110.5.100, 225.1.1.1)
     Protocol: pim-dm, Flag: LOC ACT
     UpTime: 00:03:27
     Upstream interface: Vlan-interface300
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 2
         1: Vlan-interface103
             Protocol: pim-dm, UpTime: 00:03:27, Expires: -
         2: Vlan-interface102
             Protocol: pim-dm, UpTime: 00:03:27, Expires: -

The output shows the following information:

• Switches on the SPT path (Switch A and Switch D) have the correct (S, G) entries.

• Switch A has the correct (*, G) entry.