Brian, If you have your Aruba network configures appropriately, subnet size should not be an issue.
A number of years ago, Aruba recommended using vlan pools of /24 in order to reduce broadcast traffic, making better use of the shared airtime. The current Aruba recommendation is to enable “broadcast-filter all” on the virtual-aps. From the WebUI, check the “Drop Broadcast and Unknown Multicast” and “Convert Broadcast ARP requests to unicast” boxes. We are currently using /23s (up to 40 ijn a pool) but are moving to various sizes with a maximum of /16 due to our organizational preference. We are also using Aruba’s “Dynamic Multicast Optimization” for multicast IPTV on woreless. Bruce Osborne Wireless Engineer IT Network Services - Wireless (434) 592-4229 LIBERTY UNIVERSITY Training Champions for Christ since 1971 From: Brian Helman [mailto:bhel...@salemstate.edu] Sent: Monday, July 25, 2016 11:22 AM Subject: 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/.
