Configure the IP-Based Multicast Forwarding Mode

Language:

If you have questions about the topology used in this section, see Flow-Based Configuration Example. For the default settings, see Default Settings.

On DUT1, configure the multicast forwarding mode for IGS as IP-based.

SEFOS# configure terminal
SEFOS(config)# snooping multicast-forwarding-mode ip

Disable GMRP.
```
SEFOS(config)# set gmrp disable
```

Enable IGS.
```
SEFOS(config)# ip igmp snooping
```

Configure VLAN 2 in the switch.
```
SEFOS(config)# vlan 2
```

Configure the static VLAN entry (VLAN 2) with the required ports.

SEFOS(config-vlan)# ports extreme-ethernet 0/1-5
SEFOS(config-vlan)# exit

Enter the Interface Configuration mode for Gigabit Ethernet interface 0/1.
```
SEFOS(config)# interface extreme-ethernet 0/1
```

Set the PVID as VLAN 2.
```
SEFOS(config-if)# switchport pvid 2
```

Bring up the interface.

SEFOS(config-if)# no shutdown
SEFOS(config-if)# exit

Enter Interface Configuration mode for Gigabit Ethernet interface 0/2.
```
SEFOS(config)# interface extreme-ethernet 0/2
```

Set the PVID as VLAN 2.
```
SEFOS(config-if)# switchport pvid 2
```

Bring up the interface.

SEFOS(config-if)# no shutdown
SEFOS(config-if)# exit

Enter Interface Configuration mode for Gigabit Ethernet interface 0/3.
```
SEFOS(config)# interface extreme-ethernet 0/3
```

Set the PVID as VLAN 2.
```
SEFOS(config-if)# switchport pvid 2
```

Bring up the interface.

SEFOS(config-if)# no shutdown
SEFOS(config-if)# exit

Enter Interface Configuration mode for Gigabit Ethernet interface 0/4.
```
SEFOS(config)# interface extreme-ethernet 0/4
```

Set the PVID as VLAN 2.
```
SEFOS(config-if)# switchport pvid 2
```

Bring up the interface.

SEFOS(config-if)# no shutdown
SEFOS(config-if)# end

Enter Interface Configuration mode for Gigabit Ethernet interface 0/5.
```
SEFOS(config)# interface extreme-ethernet 0/5
```

Set the PVID as VLAN 2.
```
SEFOS(config-if)# switchport pvid 2
```

Bring up the interface.

SEFOS(config-if)# no shutdown
SEFOS(config-if)# end

Review the IGS-related configurations.

SEFOS# show ip igmp snooping globals
 
Snooping Configuration
-----------------------------
IGMP Snooping globally enabled
IIGMP Snooping is operationally enabled
IGMP Snooping Enhanced mode is disabled
Transmit Query on Topology Change globally disabled
Multicast forwarding mode is IP based
Proxy globally disabled
Proxy reporting globally enabled
Filter is disabled
Router port purge interval is 125 seconds
Port purge interval is 260 seconds
Report forward interval is 5 seconds
Group specific query interval is 2 seconds
Reports are forwarded on router ports
Group specific query retry count is 2
Multicast VLAN disabled
Leave config level is Vlan based

Review the VLAN information.

SEFOS# show vlan id 2
 
Vlan database-------------------Vlan ID             	: 2Member Ports        	: Ex0/1, Ex0/2, Ex0/3, Ex0/4, Ex0/5Untagged Ports      	: NoneForbidden Ports     	: NoneName                	:Status              	: Permanent----------------------------------------------------

Send V2 join messages for group MG1 (227.1.1.1) from host A.

Send V3 join messages for group MG1 (227.1.1.1) and SRC B (12.0.0.50) from host C.

Send multicast data packets for MG1 (01:00:5e:01:01:01) from SRC A (12.0.0.40) and SRC B (12.0.0.50).

Review the forwarding database.

SEFOS# show ip igmp snooping forwarding-database
 
Vlan     Source Address    Group Address        Ports ------ ---------------------- --------------------  -------    2      12.0.0.40         227.1.1.1           Ex0/2    2      12.0.0.50         227.1.1.1           Ex0/2, Ex0/4

Host A receives multicast data from both of the sources. However, host C receives multicast data only from SRC B.