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MAGNUM 6K SWITCHES, MNS-6K USER GUIDE
The output of “show igmp” provide useful information. The following information is provided:
IGMP State shows if IGMP is turned on (Enable) or off (Disable).
Immediate Leave provides a mechanism for a particular host that wants to leave a multicast
group. It disables the port (where the leave message is received) ability to transmit multicast
traffic.
Querier shows where the switch is acting a querier or a non-querier. In the example above
the switch is the querier.
Querier Interval shows the time period in seconds on which the switch sends general host-
query messages.
Querier Response Interval specifies maximum amount of time in seconds that can elapse
between when the querier sends a host-query message and when it receives a response from
a host.
Syntax show-group – shows the multicast groups
Magnum6K25(igmp)## show-group
GroupIp PortNo Timer LeavePending
------------------------------------------------------------------------
224.1.0.1 9 155 0
224.0.1.40 9 155 0
Magnum6K25(igmp)##
FIGURE 123 – Displaying IGMP groups
The output of the “show-group” command displays
Group IP column shows the multicast groups.
Port No shows the port where the multicast group is being detected.
Timer shows the amount of time left in seconds before the group port will be deleted (or will
not be able to route multicast traffic) if the switch does not receive a membership report.
Leave Pending column shows the number of leave messages received from this port
Every port can be individually set to three different IGMP modes – Auto, Block and Forward.
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