GE ML1200 instruction manual Show-group, Show-port, Show-router

CHAPTER 15: IGMP IGMP

show-group

The following command sequence illustrates how to display IGMP groups:

ML1200(igmp)## show-group

GroupIp PortNo Timer LeavePending

----------------------------------------

224.1.0.1	1	155	0
224.0.1.40	1	155	0

ML1200(igmp)##

The output of the show-groupcommand displays the following information:

•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.

•Auto - lets IGMP control whether the port should or should not participate sending multicast traffic

•Block - manually configures the port to always block multicast traffic

•Forward - manually configures the port to always forward multicast traffic

To set the port characteristics, use the set-portcommand in the IGMP configuration mode.

set-portport=< portlistrange> mode=<autoforwardblock>

The show-portcommand displays the port characteristics for IGMP.

show-port

The show-routercommand displays detected IGMP-enabled router ports.

show-router

The set-leavecommand enables or disables the switch to immediately process a host sending a leave message rather that wait for the timer to expire.

set-leave<enabledisable>

The set-queriercommand enables or disables a switch as IGMP querier.

set-querier<enabledisable>

The set-qicommand sets the IGMP querier router to periodically send general host- query messages. These messages are sent to ask for group membership information. This is sent to the all-system multicast group address, 224.0.0.1. The valid range can be from 60 to 127 seconds, with a default of 125.

set-qiinterval=<value>

The set-qricommand sets the query response interval representing the maximum amount of time that can elapse between when the querier router sends a host-query message and when it receives a response from a host. The range can be from 2 to 270 seconds, with a default of 10. Restrictions apply to the maximum value because of an internal calculation that is dependent on the value of the query interval.

set-qriinterval=<value>

MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL 15–7