I'm in the process of testing a new network environment that replaces all of my existing L2 trunks with L3 routed links. I plan to use L3 routed links all the way to the access layer.
My existing environment consists of a variety of Cisco switches; all connected with L2 trunks. L2 trunks are used between the core and distribution, distribution and the access layer and between access switches as well. I've figured out what I need to do to migrate this environment from L2 to L3.
I've made a lot of progress so far and have dealt with several issues already. The only real problem left to figure out is what to do with my existing wireless networks/APs.
I currently have 60+ APs (1231Gs and 1242AGs) running in autonomous mode all over my LAN. These APs are deployed throughout the campus, connected to nearly every wiring closet in every building on campus. I have six spanned VLANs (140-145) for my six wireless LANs. These six VLANs are spanned across my entire network. This, of course, allows client workstation mobility. With a L3 routed LAN design, I can't have VLANs spanned across multiple wiring closets... hence, my problem.
So... I've been looking for solutions to the problem. With help here on NetPro, I've come up with the following possibilities:
1. A parallel network, trunked back at L2 to my server farm. This would allow me to keep my existing L2 and VLANs setup. I would, however, have to deploy a lot more hardware to build this parallel network. Cost isn't an issue - I have a bunch of old 2912XL/2924XL hardware I can use.
2. Creating six wireless VLANs on each and every floor of every building (~25 floors in total = ~150 VLANs) and not worrying about the roaming issues re: IP#s changing on the client.
3. Same as #2, but implementing Mobile-IP to solve the changing IP# issue.
4. Implementing LWAPP. Converting my wireless over to LWAPP APs, installing and configuring the WCS, etc., tunnelling traffic back to the WCS. This is my long-term plan... but I think it will take a lot of time to plan and implement. With LWAPP, do I have to create all the VLANs on each floor like I will with option #2?
I welcome your comments (positive and negative) and help! I'm not leaning in any particular direction -- all I know is that I'd like to move ahead with the overall distributed L3 routing project, but wireless is holding me up!
Thanks very much.
(Cross-posted in the Network Infrastructure / LAN Switching forum.)