272CHAPTER 9: BRIDGE-WIDE PARAMETERS

bridge multicast igmp queryMode

3500

9000

9400

3900

9300

For CoreBuilder 9000: Applies to Layer 2 switching modules only.

Enables or disables the querying function of the Internet Group Management Protocol (IGMP). From all IGMP-capable devices on a given subnetwork, the one with the lowest IP address is elected as the querier.

Valid Minimum Abbreviation

b mu i querym

Important Considerations

The value that you select applies to the entire system.

If you enable igmp querymode, but disable igmp snoopmode, the system or module cannot operate as an IGMP querier.

To prevent IP multicast traffic from occupying unnecessary bandwidth, the best device to operate as the querier is the one closest to the source of IP multicast traffic. You can disable querying on select devices or manipulate IP addresses with the bridge multicast igmp queryIpAddress command to force this configuration.

IGMP querying must be disabled on a CoreBuilder 9400 switch if you configure it as a MultiPoint Link Aggregation (MPLA) core switch. For more information about MPLA, see the CoreBuilder 9400 Implementation Guide.

For the CoreBuilder 3500 system and CoreBuilder 9000 Layer 3 modules, IGMP commands exist under the ip multicast igmp menu.

Options

Prompt

Description

Possible Values

[Default]

 

 

 

 

 

IGMP

Whether the system can

enabled

enabled (factory

querying

operate as the IGMP querier if

disabled

default), or

 

so elected

current value

 

 

 

 

 

 

 

 

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3Com 3500 manual Bridge multicast igmp queryMode