428 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.
Table77 describes the fields in this display. Table 76 on page 427
describes the fields in the display when a querier other than the WX is
present.
Table77 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.