3Com CoreBuilder 3500, Command Reference Manual

Page: 272 / 784

272 C
HAPTER
9: B
RIDGE
-
WIDE
P
ARAMETERS
bridge multicast igmp
3500
✓
9000
✓
9400
✓
3900
✓
9300
queryMode
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
querying Whether the system can
operate as the IGMP querier if
so elected
■
enabled
■
disabled
enabled (factory
default), or
current value