It depends on the functionality you need. You can do a single very large VLAN (definitely /16, and we're currently exploring the possibility of a /15 with Aruba and Brocade) per SSID with no problems, but you will sacrifice some flexibility. You should read the Single VLAN Architecture VRD at http://community.arubanetworks.com/t5/Validated-Reference-Design/Single-VL AN-Architecture-for-WLAN/ta-p/257196. It's not that long and it's loaded with important info. Even if you don't deploy a large VLAN, you'll gain insight into many important features and their limitations.
If you can't deploy as recommended in the VRD, you'll probably want to keep your network segments small (say /23, maybe /22). Of course, this comes with a lot of management overhead in a large network. I would also recommend that a new customer design for dual-stacked clients. You can get away with some things in an IPv4-only network that will cause problems for IPv6. Even if you won't be dual-stacked right away, you probably will soon, so lay the groundwork now. Chuck Enfield Manager, Wireless Engineering Telecommunications & Networking Services The Pennsylvania State University 110H, USB2, UP, PA 16802 ph: 814.863.8715 fx: 814.865.3988 From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Brian Helman Sent: Monday, July 25, 2016 11:22 AM To: [email protected] Subject: [WIRELESS-LAN] How big are your wireless segments? We are in the process of moving from a controllerless vendor to Aruba. Our current design is very segmented, to keep wireless device broadcasts from overwhelming the network and AP's (we had this problem back in 11g days). Presently, we've limited segments to /23's (give or take). In your controller-based environments, how large have you let these segments go? Is a /21, /20 . viable? -Brian ____________________________________ Brian Helman, M.Ed | Director, ITS/Networking Services | *: 978.542.7272 Salem State University, 352 Lafayette St., Salem Massachusetts 01970 GPS: 42.502129, -70.894779 ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
