Chapter 14
| Multicast Filtering
Layer 3 IGMP (Query used with Multicast Routing)
– 582 –
Displaying Multicast
Group Information
When IGMP (Layer 3) is enabled on the switch, use the Multicast > IGMP > Group
Information pages to display the current multicast groups learned through IGMP.
When IGMP (Layer 3) is disabled and IGMP (Layer 2) is enabled, the active multicast
groups can be viewed on the Multicast > IGMP Snooping > Forwarding Entry page
(see page 556).
Command Usage
To display information about multicast groups, IGMP must first be enabled on the
interface to which a group has been assigned (see “Configuring IGMP Interface
Parameters” on page 578), and multicast routing must be enabled globally on the
system (see “Configuring Global Settings for Multicast Routing” on page 754).
Parameters
These parameters are displayed:
Show Information
◆ VLAN – VLAN identifier. The selected entry must be a configured IP interface.
(Range: 1-4094)
◆ Group Address – IP multicast group address with subscribers directly attached
or downstream from the switch.
◆ Last Reporter – The IP address of the source of the last membership report
received for this multicast group address on this interface.
◆ Up Time – The time elapsed since this entry was created. (Depending on the
elapsed time, information may displayed for w:weeks, d:days, h:hours,
m:minutes, or s:seconds.)
◆ Expire – The time remaining before this entry will be aged out. (Default: 260
seconds)
This parameter displays “stopped” if the Group Mode is INCLUDE.
◆ V1 Timer – The time remaining until the switch assumes that there are no
longer any IGMP Version 1 members on the IP subnet attached to this interface.
■
If the switch receives an IGMP Version 1 Membership Report, it sets a timer
to note that there are Version 1 hosts present which are members of the
group for which it heard the report.
■
If there are Version 1 hosts present for a particular group, the switch will
ignore any Leave Group messages that it receives for that group.
Show Details
The following additional information is displayed on this page:
◆ VLAN – VLAN identifier. The selected entry must be a configured IP interface.
(Range: 1-4094)
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