Received IGMP-3-QUERY_INT_MISMATCH from unknown host

[cHrome08]

Hi Everyone,

I have been receiving the following logs on my cisco Core switch.

%IGMP-3-QUERY_INT_MISMATCH: Received a non-matching query interval 125, from querier address 192.168.1.254

First and foremost, this core switch has multiple vlans on it which provides internet service to multiple in the building.

In the vlans, the ip address used are within the 10.0.0.0/8 subnet and thus I am not sure from where does this 192.168.1.254 query is coming from.

I look up on the internet and most of the discussions are from known querier address.

I was wondering if there is anyone who could actually advise me on how I could pinpoint from which vlan or port is this query coming from.

Thanks.

[balaji.bandi · Accepted solution]

since you have mnetioned you have different buildings connected, if they layer2  and do you have securiy configured those ports and devices.

Check this post may help you to resolve :

https://community.cisco.com/t5/routing/error-igmp-3-query-int-mismatch-received-a-non-matching-query/td-p/3346290

[cHrome08]

Hi BB,

I was finally able to find out who was the culprit.

Although my layer 3 IP for the vlan is different, I am receiving the igmp 

>show run int vlan 124

interface Vlan124
ip address 10.8.113.129 255.255.255.224

>show ip igmp groups

239.255.255.250  Vlan124                  03:55:22  00:05:13  192.168.1.100

I then proceed to configure the igmp query-interval to 125 for this vlan and that resolves the issue.

Thanks for the guidance.

Regards,

Han