Operation Manual

IGMP Snooping Commands

Mobility System Software Command Reference Guide

Version 7.3

14 – 386

show igmp querier

Displays information about the active multicast querier, on one VLAN or all VLANs. Queriers are

listed separately for each VLAN. Each VLAN can have only one querier.

Syntax

show igmp querier [vlan vlan-id]

Defaults

None.

Access

Enabled.

History

Introduced in MSS Version 1.0.

Examples

The following command displays querier information for VLAN orange:

MX# show igmp querier vlan orange

Querier for vlan orange

Port Querier-IP Querier-MAC TTL

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

1 193.122.135.178 00:0b:cc:d2:e9:b4 23

The following command shows the information MSS displays when the querier is the MX:

MX# show igmp querier vlan default

Querier for vlan default:

I am the querier for vlan default, time to next query is 20

The output indicates how many seconds remain before the pseudo-querier on the switch

broadcasts the next general query report to IP address 224.0.0.1, the multicast all-systems group.

If IGMP snooping does not detect a querier, the output indicates this finding, as shown in the

following example:

MX# show igmp querier vlan red

Querier for vlan red:

There is no querier present on vlan red

This condition does not necessarily indicate a problem. For example, election of the querier might

be in progress.

Table 14– 3 on page 386 describes the fields in the display when a querier other than the MX

switch is present.