Querier Not Elected

If a Querier is not elected, use the following procedure to troubleshoot the issue.

Procedure

  1. Enter Privileged EXEC mode:

    enable

  2. As the IGMP Layer 2 Querier is based on IGMP snoop, check whether IGMP snoop is enabled on the VLAN:

    show ip igmp interface vlan

    If IGMP snoop is disabled, the Layer 2 Querier cannot work until IGMP snoop and IGMP Layer 2 Querier are reenabled.

Example

Check whether IGMP snoop is enabled on the VLAN:

Switch:1>enable
Switch:1#show ip igmp interface vlan

==========================================================================================
                                  Vlan Ip Igmp
==========================================================================================
VLAN QUERY QUERY ROBUST VERSION LAST  PROXY  SNOOP    SNOOP    SSM     UPnP    FAST   FAST
ID   INTVL MAX                  MEMB  SNOOP  ENABLE   ORIGIN   SNOOP   FILTER  LEAVE  LEAVE
           RESP                 QUERY ENABLE                   ENABLE  Enable  ENABLE PORTS
------------------------------------------------------------------------------------------
1    125   100   2      2       10    false  false    RADIUS    false   false  false
2    125   100   2      2       10    false  false    RADIUS    false   false  false
3    125   100   2      2       10    false  false    RADIUS    false   false  false
4    125   100   2      2       10    false  false    RADIUS    false   false  false
5    125   100   2      2       10    false  false    RADIUS    false   false  false
10   125   100   2      2       10    false  false    RADIUS    false   false  false
100  125   100   2      2       10    false  false    RADIUS    false   false  false
200  125   100   2      2       10    false  false    RADIUS    false   false  false
300  125   100   2      2       10    false  false    RADIUS    false   false  false
444  125   100   2      2       10    false  false    RADIUS    false   false  false

All 10 out of 10 Total Num of Igmp entries displayed

VLAN SNOOP   SNOOP           DYNAMIC   COMPATIBILITY EXPLICIT  UPnP
ID   QUERIER QUERIER         DOWNGRADE MODE          HOST      FILTER
     ENABLE  ADDRESS         VERSION                 TRACKING  ADDRESS
------------------------------------------------------------------------------------------
1    false   0.0.0.0         enable    disable       disable   239.255.255.250/32
2    false   0.0.0.0         enable    disable       disable   239.255.255.250/32
3    false   0.0.0.0         enable    disable       disable   239.255.255.250/32
4    false   0.0.0.0         enable    disable       disable   239.255.255.250/32
5    false   0.0.0.0         enable    disable       disable   239.255.255.250/32
10   false   0.0.0.0         enable    disable       disable   239.255.255.250/32
100  false   0.0.0.0         enable    disable       disable   239.255.255.250/32
200  false   0.0.0.0         enable    disable       disable   239.255.255.250/32
300  false   0.0.0.0         enable    disable       disable   239.255.255.250/32
444  false   0.0.0.0         enable    disable       disable   239.255.255.250/32

All 10 out of 10 Total Num of Igmp entries displayed
9039040-00 Rev AB