Example for Configuring Basic IGMP Functions

After basic IGMP functions are configured in the multicast network, user hosts can stably receive multicast data from multicast sources for a long period of time.

Networking Requirements

In the IPv4 network shown in Figure 1, unicast routes work properly. Multicast must be implemented in the network to enable hosts to receive the Video On Demand (VoD) information.

When the host connected to a certain interface of a FW needs to receive a popular program for a long time, you can add the interface to a multicast group statically. As shown in the following network, if Host A and Host B need to receive the multicast data of multicast group 225.1.1.1 for a long time, add GE 1/0/1 of the FW_A to multicast group 225.1.1.1 statically.

Figure 1 Networking diagram of configuring basic IGMP functions

Configuration Roadmap

The configuration roadmap is as follows:

Enable multicast on all FWs because multicast is a prerequisite to IGMP.
Enable PIM-SM on all interfaces.
Enable IGMP on the interface connected to hosts.
Add GE 1/0/1 on FW_A to multicast group 225.1.1.1 statically. In this manner, hosts can steadily receive the multicast data of multicast group 225.1.1.1 for a long period of time.

Procedure

Enable multicast on each FW, and configure IGMP and PIM-SM on the interface connected to hosts.
Enable multicast on FW_A; enable IGMP and PIM-SM on Gigabit Ethernet 1/0/1; configure the IGMP version to 2. The configurations of FW_B and FW_C are the same as the configuration of FW_A, and are not provided here.
```
[FW_A] multicast routing-enable
[FW_A] interface GigabitEthernet 0/0/1
[FW_A-GigabitEthernet0/0/1] pim sm
[FW_A-GigabitEthernet0/0/1] igmp enable
[FW_A-GigabitEthernet0/0/1] quit
[FW_A] pim
[FW_A-pim] static-rp 192.168.4.1
[FW_A-pim] quit
```
Add GE 1/0/1 on FW_A to multicast group 225.1.1.1 statically. In this manner, the hosts connected to GE 1/0/1 can steadily receive the multicast data sent to multicast group 225.1.1.1.
```
[FW_A] interface GigabitEthernet 0/0/1
```
```
[FW_A-GigabitEthernet0/0/1] igmp static-group 225.1.1.1
```

Verify the configuration.

# Run the display igmp interface command to view the configuration and running status of IGMP on the interfaces of each FW. Take the display on GE 1/0/1 of FW_B as an example.

<FW_B> display igmp interface GigabitEthernet 0/0/1
Interface information of VPN-Instance: public net
 GigabitEthernet0/0/1(10.110.2.1):
   IGMP is enabled
   Current IGMP version is 2
   IGMP state: up 
   IGMP group policy: none
   IGMP limit: -
   Value of query interval for IGMP (negotiated): - 
   Value of query interval for IGMP(in seconds): 60 s
   Value of other querier timeout for IGMP(in seconds): 0 s
   Value of maximum query response time for IGMP(in seconds): 10 s
   Querier for IGMP: 10.110.2.1 (this router)

# Run the display pim routing-table command on FW_A to check whether GE 1/0/1 is added to multicast group 225.1.1.1 statically. If (*, 225.1.1.1) entry is generated on FW_A, the downstream interface is GE 1/0/1, and the protocol type is set to static, it indicates that GE 1/0/1 is successfully added to multicast group 225.1.1.1.

<FW_A> display pim routing-table
VPN-Instance: public net
 Total 1 (*, G) entry; 0 (S, G) entry
 (*, 225.1.1.1)
     RP: 192.168.4.1
     Protocol: pim-sm, Flag: WC
     UpTime: 00:12:17
     Upstream interface: GigabitEthernet0/0/3
         Upstream neighbor: 192.168.1.1
         RPF prime neighbor: 192.168.1.1
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/0/1
             Protocol: static, UpTime: 00:12:17, Expires: -

Configuration Scripts

Configuration script of FW_A

 sysname FW_A

 multicast routing-enable

interface GigabitEthernet0/0/1

 ip address 10.110.1.1 255.255.255.0

 pim sm

 igmp enable

igmp static-group 225.1.1.1

interface GigabitEthernet0/0/3

 link-protocol ppp

 ip address 192.168.1.1 255.255.255.0

 pim sm

ospf 1

 area 0.0.0.0

  network 10.110.1.0 0.0.0.255

  network 192.168.1.0 0.0.0.255

pim

static-rp 192.168.4.1

return

Configuration script of FW_B

 sysname FW_B

 multicast routing-enable

interface GigabitEthernet0/0/1

 ip address 10.110.2.1 255.255.255.0

 pim sm

 igmp enable

interface GigabitEthernet0/0/3

 link-protocol ppp

 ip address 192.168.2.1 255.255.255.0

 pim sm

ospf 1

 area 0.0.0.0

  network 10.110.2.0 0.0.0.255

  network 192.168.2.0 0.0.0.255

pim

static-rp 192.168.4.1

return

Configuration script of FW_C

 sysname FW_C

 multicast routing-enable

interface GigabitEthernet0/0/1

 ip address 10.110.2.2 255.255.255.0

 pim sm

 igmp enable

interface GigabitEthernet0/0/3

 link-protocol ppp

 ip address 192.168.3.1 255.255.255.0

 pim sm

ospf 1

 area 0.0.0.0

  network 10.110.2.0 0.0.0.255

  network 192.168.3.0 0.0.0.255

pim

static-rp 192.168.4.1

return