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Configuring the Switch
3-180
3
Displaying Multicast Group Information
When IGMP (Layer 3) is enabled on this switch the current multicast groups learned
via IGMP can be displayed in the IP/IGMP/Group Information page. When IGMP
(Layer 3) is disabled and IGMP (Layer 2) is enabled, you can view the active
multicast groups in the IGMP Snooping/IP Multicast Registration Table (see
page 3-175).
Command Attributes
Group Address – IP multicast group address with subscribers directly attached or
downstream from this switch.
Interface – The interface on this switch that has received traffic directed to the
multicast group address.
Last Reporter – The IP address of the source of the last membership report
received for this multicast group address on this interface. If no membership report
has been received, this object has the value 0.0.0.0.
Up time – The time elapsed since this entry was created.
Expire – The time remaining before this entry will be aged out.
(Default: 260 seconds)
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.
(Default: 400 seconds)
- 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.
Web – Click IP, IGMP, IGMP Group Membership.
Figure 3-104 IGMP Group Membership
CLI – The following shows the IGMP groups currently active on VLAN 1.
Console#show ip igmp groups vlan 1 4-240
GroupAddress InterfaceVlan Lastreporter Uptime Expire V1Timer
--------------- --------------- --------------- -------- -------- ---------
234.5.6.8 1 10.1.5.19 7068 220 0
Console#
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