Although we are a Cisco shop, I am not familiar with Cisco's current wireless offerings.
We use Aruba wireless and , for our larger segments, we can group several vlans into a pool that is either assigned based off a mac address hash, or load is balanced across subnets. We use /23 subnets in these pools. For users where we cannot use pools, we are currently using /21. Using smaller subnets where possible reduces the broadcasts in the limited RF bandwidth available. When we last adjusted our design, Aruba recommended /24 for the subnets in a vlan pool. We use /23 to reduce the number of vlans in a pool. Bruce Osborne Network Engineer IT Network Services (434) 592-4229 LIBERTY UNIVERSITY Training Champions for Christ since 1971 -----Original Message----- From: Luke Jenkins [mailto:[email protected]] Sent: Tuesday, July 31, 2012 5:43 PM Subject: Re: Wireless Client Subnet sizing What type of gear are you using? Cisco is now recommending using /21s for their unified wireless gear (Sujit Ghosh, Cisco Live US 2012 BRKEWN-2010, Slide 75). -Luke =-=-=-=-=-=-=-=-=-=-=-= Luke Jenkins Network Engineer Weber State University On Jul 31, 2012, at 11:59 AM, Craig Simons <[email protected]> wrote: > All, > > We are looking at re-engineering our wireless networking IP space and I'm > wondering what type of boundaries other have pushed their networks to. We are > currently using /22 networks (14 of them) most of which during a busy period > of the day will run around 75-80% utilization (at least as far as DHCP > assignments go). When I look at most APs during the day, I see that most APs > have users belonging to several networks (roaming), and as we have multicast > disabled, it would seem that the advantages of segregating wireless networks > on the basis of limiting broadcast domain are moot. Is anyone running /21 > networks or larger? > > We've investigated NAT, but accurately logging internal-external IP address > assignments for our users has proven difficult. Our vendor also doesn't > currently support any type of "VLAN pooling" feature. > > Interested in your opinions, > Craig > > > > -------------------------------------- > Craig Simons > Network Operations > Simon Fraser University > Burnaby BC, Canada > em. [email protected] > ph. 778-782-8036 > ce. 604-649-7977 > tw. twitter.com/simonscraig > -------------------------------------- > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found > athttp://www.educause.edu/groups/. ********** 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/.
