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520 CHAPTER 13: IGMP SNOOPING COMMANDS
History — Introduced in MSS Version 3.0.
Examples — The following command displays querier information for
VLAN orange:
WX1200# display 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 WX itself:
WX1200# display 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 WX 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:
WX1200# display 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 83 describes the fields in this display. Table 82 on page 519
describes the fields in the display when a querier other than the WX is
present.
Table 83 Output for display igmp mrouter
Field Description
Querier for vlan VLAN containing the querier. Information is listed separately for
each VLAN.
Querier-IP IP address of the querier interface.
Querier-MAC MAC address of the querier interface.
TTL Number of seconds before this entry ages out if the WX does
not receive a query message from the querier.