Example for Configuring PIM-SSM Multicast

This section provides an example for configuring basic Protocol Independent Multicast-Source-Specific Multicast (PIM-SSM) functions so that hosts can receive multicast data from specific multicast source.

Networking Requirements

On the ISP network shown in Figure 1, multicast services are deployed. An IGP has been deployed on this network, and unicast traffic forwarding is normal. It is required that hosts on the network can join source-specific multicast groups.

Figure 1 Configuring PIM-SSM multicast

**Table 1**
Device	Interface	IP Address
Device A	GE 0/1/0	192.168.2.1/24
Device A	GigabitEthernet0/1/8	10.110.1.2/24
DeviceB	GE 0/1/0	192.168.2.2/24
DeviceB	GE 0/1/8	192.168.4.1/24
Device C	GE 0/1/0	192.168.4.2/24
Device C	GigabitEthernet0/1/8	10.110.2.1/24

Precautions

When configuring PIM-SSM multicast, note the following precautions:

PIM-SM must be enabled before IGMP is enabled.
You must set the same SSM group address range on all routers.
A Rendezvous Point (RP) must be configured on the PIM-SSM network.

Configuration Roadmap

The configuration roadmap is as follows:

Configure an IP address for each router interface and configure a unicast routing protocol.
Enable multicast routing on all multicast routers.
Enable PIM-SM on all router interfaces.
Enable IGMP on interfaces that directly connect to hosts.
Set the same SSM group address range on all routers.

Data Preparation

To complete the configuration, you need the following data:

IP address of the multicast source
SSM group address range

Procedure

Configure an IP address for each router interface and a unicast routing protocol. For configuration details, see Configuration Files in this section.

Enable multicast routing on each router and PIM-SM on each router interface.

# Configure Device A. Repeat this step for Device B and Device C. For configuration details, see Configuration Files in this section.

[~DeviceA] multicast routing-enable
[*DeviceA] interface gigabitethernet 0/1/8
[*DeviceA-GigabitEthernet0/1/8] pim sm
[*DeviceA-GigabitEthernet0/1/8] quit
[*DeviceA] interface gigabitEthernet 0/1/0
[*DeviceA-GigabitEthernet0/1/0] pim sm
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit

Enable IGMP on Device interfaces that directly connect to hosts.

# Enable IGMP on the interface connecting Device C to the host and set the IGMP version to 3.

[~DeviceC] interface gigabitethernet 0/1/8
[~DeviceC-GigabitEthernet0/1/8] igmp enable
[*DeviceC-GigabitEthernet0/1/8] igmp version 3
[*DeviceC-GigabitEthernet0/1/8] commit
[~DeviceC-GigabitEthernet0/1/8] quit

Set the SSM group address range to 232.1.1.0/24 on all Devices.

# Configure router A. Repeat this step for Device B and Device C. For configuration details, see Configuration Files in this section.

[~DeviceA] acl number 2000
[*DeviceA-acl4-basic-2000] rule permit source 232.1.1.0 0.0.0.255
[*DeviceA-acl4-basic-2000] quit
[*DeviceA] pim
[*DeviceA-pim] ssm-policy 2000
[*DeviceA-pim] commit
[~DeviceA-pim] quit

Verify the configuration.

# Have Host A receive the data sent from source 10.110.1.1/24 to group 232.1.1.1/24. Then, run the display pim routing-table command to view information about the PIM routing table on each router. The following examples use the command outputs on Device A and Device B.

<DeviceA> display pim routing-table
 VPN-Instance: public net
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.110.1.1, 232.1.1.1)
     Protocol: pim-ssm, Flag: LOC
     UpTime: 00:02:13
     Upstream interface: GigabitEthernet0/1/8, Refresh time: 00:02:13
         Upstream neighbor: 10.110.1.1
         RPF prime neighbor: 10.110.1.1
     Downstream interface(s) information:
     Total number of downstreams: 1
        1: GigabitEthernet0/1/0
             Protocol:  pim-ssm, UpTime: 00:02:13, Expires: 00:03:17
<DeviceB> display pim routing-table
 VPN-Instance: public net
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.110.1.1, 232.1.1.1)
     Protocol: pim-ssm, Flag:
     UpTime: 00:09:15
     Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:09:15
         Upstream neighbor: 192.168.2.1
         RPF prime neighbor: 192.168.2.1
     Downstream interface(s) information:
     Total number of downstreams: 1
        1: GigabitEthernet0/1/8
             Protocol:  pim-ssm, UpTime: 00:09:15, Expires: 00:03:13

Configuration Files

Device A configuration file

#
sysname DeviceA
#
multicast routing-enable
#
acl number 2000
 rule 5 permit source 232.1.1.0 0.0.0.255
#
isis 1
 network-entity 10.0000.0000.0001.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 192.168.2.1 255.255.255.0
 pim sm
 isis enable 1
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 10.110.1.2 255.255.255.0
 pim sm
 isis enable 1
#
pim
 ssm-policy 2000
#
return

Device B configuration file

#
sysname DeviceB
#
multicast routing-enable
#
acl number 2000
 rule 5 permit source 232.1.1.0 0.0.0.255
#
isis 1
 network-entity 10.0000.0000.0002.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 192.168.2.2 255.255.255.0
 pim sm
 isis enable 1
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 192.168.4.1 255.255.255.0
 pim sm
 isis enable 1
#
pim
 ssm-policy 2000
#
return

Device C configuration file

#
sysname DeviceC
#
multicast routing-enable
#
acl number 2000
 rule 5 permit source 232.1.1.0 0.0.0.255
#
isis 1
 network-entity 10.0000.0000.0003.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 192.168.4.2 255.255.255.0
 pim sm
 isis enable 1
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 10.110.2.1 255.255.255.0
 pim sm
 igmp enable
 igmp version 3
 isis enable 1
#
pim
 ssm-policy 2000
#
return