Multicast
Configuring IGMP Snooping
260 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 
16
There can be only one IGMP Querier in a network. The device supports 
standards-based IGMP Querier election. Some of the values of the operational 
parameters of this table are sent by the elected querier. The other values are 
derived from the device.
STEP  4 Enter the parameters.
• VLAN ID—Select the VLAN ID on which IGMP snooping is defined.
• IGMP Snooping Status—Enable or disable the monitoring of network traffic 
for the selected VLAN.
• Operational IGMP Snooping Status—Displays the current status of the 
IGMP Snooping for the selected VLAN.
• MRouter Ports Auto Learn—Enable or disable auto learning of the ports to 
which the Mrouter is connected. 
• Query Robustness—Enter the Robustness Variable value to be used if this 
device is the elected querier. 
• Operational Query Robustness—Displays the robustness variable sent by 
the elected querier.
• Query Interval—Enter the interval between the General Queries to be used 
if this device is the elected querier. 
• Operational Query Interval—The time interval in seconds between General 
Queries sent by the elected querier. 
• Query Max Response Interval—Enter the delay used to calculate the 
Maximum Response Code inserted into the periodic General Queries.
• Operational Query Max Response Interval—Displays the Query Max 
Response Interval included in the General Queries sent by the elected 
querier.
• Last Member Query Counter—Enter the number of IGMP Group-Specific 
Queries sent before the device assumes there are no more members for the 
group, if the device is the elected querier.
• Operational Last Member Query Counter—Displays the operational value 
of the Last Member Query Counter.
• Last Member Query Interval—Enter the Maximum Response Delay to be 
used if the device cannot read Max Response Time value from group-
specific queries sent by the elected querier.