Detailed campus wireless LAN design guidance is provided on the Cisco Solution Reference Network Design Guides home page, available at http://www.cisco.com/go/srnd Cisco AVVID Design … Cisco Systems, Inc. All contents are Copyright © 1992-2004 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 1 of 33 Application Note Cisco Fast Secure Roaming Cisco Systems® is pleased to introduce Cisco fast secure roaming with Cisco IOS® Software release 12.2(11)JA for Cisco Aironet® 1200 and 1100 Series

Cisco Systems® is pleased to introduce Cisco fast secure roaming with Cisco IOS® Software release 12.2(11)JA for Cisco Aironet® 1200 and 1100 Series Access Pointsand Cisco Aironet Client Adapter Installation Wizard version 1.1. Cisco fast secure roaming, a component of Wireless Domain Services, provides significant enhancements to Layer 2 (L2) roaming performance. With Cisco fast secure roaming, wireless LAN (WLAN) clients can roam between Cisco Aironet access points in fewer than 150ms. This application note examines all aspects of L2 roaming including: the necessity for fast secure roaming, L2 roaming components, fast secure roaming latency improvements, and configuration considerations for fast secure roaming. Author Bruce McMurdo, a Cisco enterprise solution design technical marketing engineer, is the author of this application note. Introduction Wireless domain services (WDS) is introduced with the Cisco Structured Wireless-Aware Network (SWAN). WDS is a collection of Cisco IOS Software features that enhance WLAN client mobility and simplify WLAN deployment and management. These services, supported today on access points and client devices, and on specific Cisco LAN switches and routers in 2004, include fast secure roaming and Institute of Electrical and Electronics Engineers (IEEE) 802.1X local authentication. Fast secure roaming is supported by Cisco Aironet 1200 and 1100 Series access points inconjunction with Cisco or Cisco Compatible client devices. With fast secure roaming, authenticated client devices can roam securely at L2 from one access point to another without any perceptible delay during reassociation. Fast secure roaming supports latency-sensitive applications such as wireless voice over IP (VoIP), enterprise resource planning (ERP), or Citrix-based solutions (Figure 1). WDS provides fast, secure handoff services to access points, without dropping connections, for fewer than 150ms roaming within a subnet.

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