Querier Not Elected

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

Procedure

Enter Privileged EXEC mode:

enable
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  SSM     UPnP    FAST   FAST
ID   INTVL MAX                  MEMB  SNOOP  ENABLE SNOOP   FILTER  LEAVE  LEAVE
           RESP                 QUERY ENABLE        ENABLE  Enable  ENABLE PORTS
--------------------------------------------------------------------------------
1    125   100   2      2       10    false  false  false   false  false
2    125   100   2      2       10    false  false  false   false  false
3    125   100   2      2       10    false  false  false   false  false
4    125   100   2      2       10    false  false  false   false  false
5    125   100   2      2       10    false  false  false   false  false
10   125   100   2      2       10    false  false  false   false  false
100  125   100   2      2       10    false  false  false   false  false
200  125   100   2      2       10    false  false  false   false  false
300  125   100   2      2       10    false  false  false   false  false
444  125   100   2      2       10    false  false  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

Job Aid

The following table shows the field descriptions for the show ip igmp interface command if you use the interface parameters.


Field	Description
VLAN ID or PORT NUM	Identifies the VLAN or port where IGMP is configured.
QUERY INTVL	Indicates the frequency at which IGMP host query packets transmit on this interface.
QUERY MAX RESP	Indicates the maximum query response time (in tenths of a second) advertised in IGMPv2 queries on this interface.
ROBUST	Indicates the robustness variable, which you can configure for the expected packet loss on a subnet. If you expect packet loss on a subnet, increase the robustness variable.
VERSION	Indicates the version of IGMP that runs on this interface. This object configures a router capable of running either version. For IGMP to function correctly, you must configure all routers on a LAN to run the same version of IGMP.
LAST MEMB QUERY	Indicates the maximum response time (in tenths of a second) inserted into group-specific queries sent in response to leave group messages, and is also the amount of time between group-specific query messages. Use this value to modify the leave latency of the network. A reduced value results in reduced time to detect the loss of the last member of a group. This variable does not apply to IGMPv1.
PROXY SNOOP ENABLE	Indicates if proxy snoop is enabled on the interface.
SNOOP ENABLE	Indicates if snoop is enabled on the interface.
SSM SNOOP ENABLE	Indicates if SSM snoop is enabled on the interface.
UPnP FILTER ENABLE	Indicates if Universal Plug and Play (uPnP) Filtering is enabled to filter multicast packets destined for a specific range. The default is disabled.
FAST LEAVE ENABLE	Indicates if fast leave mode is enabled on the interface.
FAST LEAVE PORTS (VLAN parameter only)	Indicates the set of ports that are enabled for fast leave
SNOOP QUERIER ENABLE (VLAN parameter only)	Indicates if the IGMP Layer 2 Querier feature is enabled.
SNOOP QUERIER ADDRESS (VLAN parameter only)	Indicates the IP address of the IGMP Layer 2 querier.
DYNAMIC DOWNGRADE VERSION	Indicates if the dynamic downgrade feature is enabled.
COMPATIBILITY MODE	Indicates if compatibility mode is enabled.
EXPLICIT HOST TRACKING	Indicates if explicit host tracking is enabled to track all the source and group members.
UPnP FILTER ADDRESS	Indicates the multicast destination IP address to filter on an IGMP-enabled interface. The default is 239.255.255.250/32.

The following table shows the field descriptions for the show ip igmp interface command if you do not use the interface parameters.


Field	Description
IF	Indicates the interface where IGMP is configured.
QUERY INTVL	Indicates the frequency at which IGMP host query packets transmit on this interface.
STATUS	Indicates the activation of a row, which activates IGMP on the interface. The destruction of a row disables IGMP on the interface.
VERS.	Indicates the version of IGMP that runs on this interface. This object configures a router capable of running either version. For IGMP to function correctly, you must configure all routers on a LAN to run the same version of IGMP.
OPER VERS	Indicates the operational version of IGMP.
QUERIER	Indicates the address of the IGMP querier on the IP subnet to which this interface attaches.
QUERY MAXRSPT	Indicates the maximum query response time (in tenths of a second) advertised in IGMPv2 queries on this interface.
WRONG QUERY	Indicates the number of queries received where the IGMP version does not match the interface version. You must configure all routers on a LAN to run the same version of IGMP. If queries are received with the wrong version, a configuration error occurs.
JOINS	Indicates the number of times this interface added a group membership.
ROBUST	Indicates the robustness variable, which you can configure for the expected packet loss on a subnet. If you expect packet loss on a subnet, increase the robustness variable.
LASTMEM QUERY	Indicates the maximum response time (in tenths of a second) inserted into group-specific queries sent in response to leave group messages, and is also the amount of time between group-specific query messages. Use this value to modify the leave latency of the network. A reduced value results in reduced time to detect the loss of the last member of a group. This variable does not apply to IGMPv1.
MODE	Indicates the protocol configured on the VLAN added. snoop—Indicates IGMP snooping is enabled on a VLAN. snoop-spb—Indicates IGMP is enabled on a VLAN with an associated I-SID (IP multicast over Fabric Connect for a Layer 2 VSN). pim—Indicates PIM is enabled. routed-spb—Indicates IP multicast over Fabric Connect is enabled on the Layer 3 VSN or for IP Shortcuts. pim-gw-spb—Indicates the SPB-PIM Gateway is enabled on the interface.
L2ISID	Indicates the I-SID associated with the Layer 2 interface.