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ProSafe Managed Switch
show mac-address-table igmpsnooping
This command displays the IGMP Snooping entries in the MFDB table.
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:).
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.
This section describes commands used to configure and display information on IGMP
Snooping Queriers on the network and, separately, on VLANs.
set igmp querier
Use this command to enable IGMP Snooping Querier on the system, using Global Config
mode, or on a VLAN. Using this command, you can specify the IP Address that the Snooping
Querier switch should use as the source address while generating periodic queries.
If a VLAN has IGMP Snooping Querier enabled and IGMP Snooping is operationally disabled
on it, IGMP Snooping Querier functionality is disabled on that VLAN. IGMP Snooping
functionality is re-enabled if IGMP Snooping is operational on the VLAN.
Note: The Querier IP Address assigned for a VLAN takes preference over
global configuration.
Switching Commands
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