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Cisco Structured Wireless-Aware Network
The Cisco Aironet 350 Series Client Adapter is a key component of the Cisco Structured Wireless-Aware Network.
The Cisco Structured Wireless-Aware Network is an innovative, comprehensive Cisco framework for deploying,
operating and managing hundreds to thousands of Cisco Aironet access points using the Cisco infrastructure. The
Cisco Structured Wireless-Aware Network extends to the wireless LAN the same level of security, scalability, and
reliability that customers have come to expect in their wired LAN by introducing “wireless-aware” capabilities into
the Cisco infrastructure.
Wireless domain services (WDS) is introduced with the Cisco Structured Wireless-Aware Network. WDS is a
collection of Cisco IOS Software features that enhance WLAN client mobility and simplify WLAN deployment and
management. These services, supported on access points and client devices today and on specific Cisco LAN switches
and routers in 2004, include fast secure roaming and IEEE 802.1X local authentication.
Fast secure roaming is supported by Cisco and Cisco Compatible client devices in conjunction with Cisco Aironet,
Cisco IOS Software-based access points. With fast secure roaming, authenticated client devices can roam securely
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 2).
Figure 2
Fast Secure Roaming
Cisco Secure
Access Control
Server Solution Engine
(AAA Server)
AP2 AP1
WAN
Router
Based WDS
Note: Because the WDS handles roaming and reauthentication, the WAN link is not used
1. Access Point must now 802.1X authenticate with the
WDS Access Point (AP1) to establish a secure session
2. Initial client 802.1X authentication goes to a central
AAA server (~500ms)
3. During a client roam, the client signals to the WDS
it has roamed and WDS will send the clients key to the
new Access Point (AP2)
4. The overall roam time is reduced to <150ms, and
in most cases, <100ms
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