Configure Queriers in Flow-Based Configurations

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You can configure an IGS switch to send IGMP queries when no IGMP routers are present in a VLAN. A switch must be configured as a querier for a VLAN only when there are no queriers or routers in the network. 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 MAC-based.

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

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 0/1-3
```

Configure VLAN 2 as querier.

SEFOS(config-vlan)# ip igmp snooping querier

Configure the query-interval time as 60 seconds.

SEFOS(config-vlan)# ip igmp snooping query-interval 60
SEFOS(config-vlan)# exit

Configure VLAN 3 in the switch.
```
SEFOS(config)# vlan 3
```

Configure the static VLAN entry (VLAN 3) with the required ports.

SEFOS(config-vlan)# ports extreme-ethernet 0/4-5
SEFOS(config-vlan)# exit

Review the IGS-related configurations.

SEFOS# show ip igmp snooping globals
 
Snooping Configuration
-----------------------------
IGMP Snooping globally enabled
IGMP Snooping is operationally enabled
IGMP Snooping Enhanced mode is disabled               
Transmit Query on Topology Change globally disabled
Multicast forwarding mode is MAC 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 IGS-related information in VLAN 2.

SEFOS# show ip igmp snooping vlan 2
 
Snooping VLAN Configuration for the VLAN 2
  IGMP Snooping enabled
  IGMP configured version is V3
  Fast leave is disabled
  Snooping switch is configured as Querier
  Snooping switch is acting as Querier
  Query interval is 60 seconds
  Port Purge Interval is 130 seconds
  Max Response Code is 100, Time is 10 seconds

Review the configuration information for VLAN 2.

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

Review the configuration information for VLAN 3.

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

Because VLAN 2 is configured as a querier, the switch sends a general query every 60 seconds on the member ports of VLAN 2.