gtm listener on a gibp ve with ltm and other modues active.

By all means, you can create a new vlan and associated self IPs (non-floating and floating), and then setup your listener on your new floating self IP. Or you can use an existing floating self IP. All a matter of personal preference, but technically either approach should work. Assuming the underlying network configurations are there to support of course.

Ok that makes sense. My question is why do you need to use the floating ip of the external subnet at all? I would think if you give a ip on the external subnet it shoud reolve to which ever active bigip is up. kind of like a virtual server that is a .20 on the same subnet as the .10 floating ip and selfips. I don't want to create a new selfips and a floating but I really don't understand why you would use the floating ip since whatever ip on the subnet will be available on which ever bigip is active.

I haven't tested what you are thinking, but in theory it should work unless there's some limitation that I'm unaware of. Creating a listener creates a corresponding virtual server, and as long as that virtual server is in a vlan with the appropriate self IPs, then gratuitous ARP should work in the event of a failover.

I'm going to mock this up in the lab tomorrow to test it out.

Just mocked up your solution and it works like a champ.

That is what I thought, but the documentation says differently. Thanks for checking it out.

Maybe more of a 'best practices' type thing to use the floating self IP. But it'll certainly work the way you want.