PIM-SSM configuration example

As shown in Figure 35:

• The receivers receive VOD information through multicast. The receiver groups of different organizations form stub networks, and one or more receiver hosts exist in each stub network. The entire PIM domain operates in the SSM mode.

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

• The SSM group range is 232.1.1.0/24.

• IGMPv3 runs between Switch A and N1 and between Switch B, Switch C, and N2.

1. Assign an IP address and subnet mask to each interface according to Figure 35. (Details not shown.)

2. Configure OSPF on the switches in the PIM-SSM domain to make sure the following conditions are met: (Details not shown.)

   • The switches are interoperable at the network layer.

   • The switches can dynamically update their routing information.

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

   # On Switch A, enable IP multicast routing.

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

   # Enable IGMPv3 on the receiver-side interface (VLAN-interface 100).

   [SwitchA] interface vlan-interface 100
   [SwitchA-Vlan-interface100] igmp enable
   [SwitchA-Vlan-interface100] igmp version 3
   [SwitchA-Vlan-interface100] quit
   

   # Enable PIM-SM on the other interfaces.

   [SwitchA] interface vlan-interface 101
   [SwitchA-Vlan-interface101] pim sm
   [SwitchA-Vlan-interface101] quit
   [SwitchA] interface vlan-interface 102
   [SwitchA-Vlan-interface102] pim sm
   [SwitchA-Vlan-interface102] quit
   

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

   # Enable IP multicast routing and PIM-SM on Switch D and Switch E in the same way Switch A is configured. (Details not shown.)

4. Configure the SSM group range:

   # Configure the SSM group range as 232.1.1.0/24 on Switch A.

   [SwitchA] acl number 2000
   [SwitchA-acl-basic-2000] rule permit source 232.1.1.0 0.0.0.255
   [SwitchA-acl-basic-2000] quit
   [SwitchA] pim
   [SwitchA-pim] ssm-policy 2000
   [SwitchA-pim] quit
   

   # Configure the SSM group range on Switch B, Switch C, Switch D and Switch E in the same way Switch A is configured. (Details not shown.)

# Display PIM information on Switch A.

[SwitchA] display pim interface
 Interface           NbrCnt HelloInt   DR-Pri     DR-Address
 Vlan100             0      30         1          10.110.1.1     (local)
 Vlan101             1      30         1          192.168.1.2
 Vlan102             1      30         1          192.168.9.2

# Send an IGMPv3 report from Host A to join the multicast source and group (10.110.5.100, 232.1.1.1). (Details not shown.)

# Display PIM routing table information on Switch A.

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

 (10.110.5.100, 232.1.1.1)
     Protocol: pim-ssm, Flag:
     UpTime: 00:13:25
     Upstream interface: Vlan-interface101
         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: igmp, UpTime: 00:13:25, Expires: 00:03:25

# Display PIM routing table information on Switch D.

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

 (10.110.5.100, 232.1.1.1)
     Protocol: pim-ssm, Flag: LOC
     UpTime: 00:12:05
     Upstream interface: Vlan-interface300
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: Vlan-interface105
             Protocol: pim-ssm, UpTime: 00:12:05, Expires: 00:03:25

The output shows that switches on the SPT path (Switch A and Switch D) have generated the correct (S, G) entries.