C
HAPTER
15
| Multicast Filtering
Layer 3 IGMP (Query used with Multicast Routing)
– 418 –
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 404).
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 413), and multicast routing must be
enabled globally on the system (see "Configuring Global Settings for
Multicast Routing" on page 544).
CLI REFERENCES
◆ "show ip igmp groups" on page 944
PARAMETERS
These parameters are displayed in the web interface:
Show Information
◆ VLAN – VLAN identifier. The selected entry must be a configured IP
interface. (Range: 1-4093)
◆ 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.
To Next Page
Loading...
Need help?
General
