3Com 3500 - Manual (Page 524)

524 C HAPTER 18: IP M ULTICAST
ip multicast igmp
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snooping
For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Enables or disables the system’s ability to understand the Internet Group
Management Protocol (IGMP) and snoop on IGMP packets to determine
if IP multicast group members exist downstream from routing interfaces
and therefore if the system should forward group traffic on those
interfaces.
Valid Minimum Abbreviation
ip m i s
Important Considerations
■
Your selection applies to all interfaces in the system.
■
3Com recommends that you keep IGMP snooping enabled at all
times. It adds little processing overhead to the system and enhances
the efficiency of your network if IP multicast traffic is present.
Options
Prompt Description Possible Values [Default]
snooping
mode Whether the system
can observe, record,
and react to IGMP
packets and set
filters on appropriate
ports in an interface
■
enabled
■
disabled
enabled (factory default),
or current value