Schilling:
All the enterprise AP vendors address this out of the box, some via a centralized data plane, others distributed, and some both. In the centralized data plane model, there is a some kind of tunnel that goes to the core or the distribution layer closet switch/controller. Because it's centralized, the switch/controller tracks state and facilitates roaming events. All the VLAN(s) go to the switch/controller, and the AP can essentially be on any routable subnet. In the distributed model, there is a still a controller, but the VLANs are delivered to each AP. Some call that a VLAN 'explosion'. The controller still tracks state and facilitates roaming events. The vendors build their L3 roaming solution on standards, but the end result is proprietary and unique to every vendor. I don't want to say this aspect isn't worth considering, but the problem has essentially be well-addressed. Frank From: schilling [mailto:[EMAIL PROTECTED] Sent: Friday, January 18, 2008 8:14 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] wireless mobility/roaming architecture/design Hi All, With more iphones alike devices coming to campus, IP mobility becomes a not trivial issue. Our campus are thinking of mobility supporting architecture/design. Our current wireless architecture is using Bluesocket Gateway for web authentication with foundy AP, cisco AP, some others. We have several options as follows: 1. have a L3 VLAN in the core, and span this L2 VLAN to every AP with a separate SSID for IP mobility users. good: simple bad: management nightmare; will not scale; 2. IP mobility routing in the core (catalyst 6500) good: RFC compliant bad: will all kinds of AP support? Client support? 3. WLC and LWAP, we don't have that wireless infrastructure yet. We would really appreciate if you can share how you design/implement your wireless network to accomplish the IP mobility. Thanks. Schilling Florida State University ********** 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/.
