Brian:
Can you explain how the beacon period relates to management traffic dominating 802.11g traffic, besides the beacons that are (normally) sent every 100 msec? Frank From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Kellogg, Brian D. Sent: Tuesday, February 17, 2009 9:47 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Density and Cisco LWAPP We have a dense deployment of APs here. Typically we try to keep the number of users per AP to around a 1:9 ratio. What we found is that if you do not tweak the beacon period then the G spectrum ends up with around 20% of the available bandwidth being consumed by management traffic in a dense deployment. We have not had any adverse problems with changing this parameter, and I have not read anything as yet as to potential serious problems with modifying the default beacon period. Presently we have the beacon period set to one second and management traffic is consuming ~ 3% to 5% of the available bandwidth. We also disable multicast on our wireless networks which cuts down on certain unwanted multicast traffic from consuming bandwidth as well. We will most likely enable multicast in the future when we get time to determine what multicast we want to allow while blocking the rest. For example when we first set up our wireless network here we found that MS machines were sending out a lot of multicast traffic on 239.255.255.250 which is the SSDP Discovery service if I remember correctly. We used an ACL to block it from flooding our WLANs. Thank you, Brian Kellogg Network Services Manager St. Bonaventure University 716-375-4092 From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Greene, Chip Sent: Tuesday, February 17, 2009 10:23 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Density and Cisco LWAPP We are currently looking to go totally wireless in two of our classrooms on campus. The rooms are back to back and we anticipate 90 users in each classroom, simultaneously. We are a totally Cisco shop and will not be using "N" for this deployment. The initial design plan calls for 5 APs in each classroom. 3APs will be A only and 2 will be G only. The G requirement is the only requirement we have for student laptops at this time. I am seeking feedback from anyone with experience in this type of deployment for large classrooms, specifically with Cisco products. Suggestions and recommendations would be appreciated. Thanks in advance. _______________________________ Chip Greene Senior Network Specialist, CCSP Jepson Hall G-12 28 Westhampton Way Richmond, VA 23173 ********** 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/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
