IGMP Querier

[kkeck]

2 Switches I am working with. Connected together via 10gig fiber. Both are Catalyst 9200's. These are SVL DANTE traffic core switches. I need to set one as IGMP querier and point the other switch to the querier.  The switches have 3 VLANS on them. VLAN 80 is the DANTE SVL specific VLAN. I need the querier on this VLAN. The switch that is to be the querier has a lower IP address and SHOULD be elected as querier by default, but it never is. The other switch always comes up as querier. I do have a ticket open; I am waiting to hear from Cisco TAC. Even if I manually set the main switch, which as a lower IP, as the querier, (ip igmp querier address x.x.x.x), it does not work (The command works, but it does not set the switch as querier), the other switch still comes up as querier. I spent almost 3 hours on the phone with Cisco last week, they do believe it is a bug with IOS 17.18.02.  DANTE is EXTREMLY picky with multicast traffic. I need to get this one switch set up as the default querier. I apologize; my explanation is not the clearest. Just dealing with 2 catalyst 9200 switches. Cisco and I deleted all IGMP entries from both switches, re-enabled all from scratch with the same results. The secondary switch always becomes the querier even though its IP is higher, and the core switch is manually set as querier. 

Thank you everyone in advance, Cisco and I cannot seem to get this fixed. 

[Mark Elsen]

  - @kkeck                     Is it possible  on the switch that should NEVER be querier to configure :
                                             vlan configuration 80
                                                   no ip igmp snooping querier enable

 M,

[kkeck]

Querier is not enabled on this, but I will try this command. 

Thank you very much!

[DFWTechGuy]

It does sound like a software bug, especially if Cisco TAC is seeing the same behavior. Since you've already tried manually setting the querier and rebuilding the IGMP configuration, there probably isn't much else to change on the config side. You should wait to see what TAC says about IOS 17.18.02. In the meantime, if possible, it may be worth testing with a different IOS version to see if the querier election works as expected there.

[kkeck]

We are a large church; and we have Vacation Bible School this week. Will be a thousand kids here every night.  I agree with you. I will wait for Cisco. I don't have the time this week to be bouncing IOS's back and forth!   😉

Thank you very much!

[charliemak]

I got the same situation in the past, we just remove the ip address of DANTE SVI. 
So in your case, on the non querier switch, there will be interface vlan 80 but no ip address .

[kkeck]

I can try this as well. There are many IP'd DANTE devices on this switch, I need to think this through. I did not think of this, but I see where you are going. 

Thank you very much. 

[fgfddfsd87799797]

the IGMP version matches between the two switches ?

[kkeck]

It does yes. DANTE recommends v2, so both are running IGMP V2