Managed Switch CLI Manual, Release 8.0.3
Switching Commands 3-148
v1.0, July 2010
show mac-address-table igmpsnooping
This command displays the IGMP Snooping entries in the MFDB table.
IGMP Snooping Querier Commands
IGMP Snooping requires that one central switch or router periodically query all end-devices on the
network to announce their multicast memberships. This central device is the “IGMP Querier”. The
IGMP query responses, known as IGMP reports, keep the switch updated with the current
multicast group membership on a port-by-port basis. If the switch does not receive updated
membership information in a timely fashion, it will stop forwarding multicasts to the port where
the end device is located.
Format show igmpsnooping mrouter vlan <unit/slot/port>
Mode Privileged EXEC
Term Definition
Interface The port on which multicast router information is being displayed.
VLAN ID The list of VLANs of which the interface is a member.
Format show mac-address-table igmpsnooping
Mode Privileged EXEC
Term Definition
MAC Address A multicast MAC address for which the switch has forwarding or filtering information. The
format is two-digit hexadecimal numbers that are separated by colons, for example
01:23:45:67:89:AB. In an IVL system the MAC address is displayed as a MAC address
and VLAN ID combination of 8 bytes.
Type The type of the entry, which is either static (added by the user) or dynamic (added to the
table as a result of a learning process or protocol).
Description The text description of this multicast table entry.
Interfaces The list of interfaces that are designated for forwarding (Fwd:) and filtering (Flt:).
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