Client Roaming - Cisco aironet 1522 Design And Deployment Manual

Connecting the Cisco 1520 Series Mesh Access Point to Your Network
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Client Roaming

High-speed roaming of Cisco Compatible Extension (CX), version 4 (v4) clients is supported at speeds
up to 70 mph in outdoor mesh deployments of AP1522s and AP1524s. An example application might be
maintaining communication with a terminal in an emergency vehicle as it moves within a mesh public
network.
Three Cisco CX v4 Layer 2 client roaming enhancements are supported:
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Cisco Aironet 1520, 1130, 1240 Series Wireless Mesh Access Points, Design and Deployment Guide, Release 6.0
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To see if VLAN transparent mode is enabled or disabled, enter the following command:
Access point assisted roaming—This feature helps clients save scanning time. When a Cisco CX
v4 client associates to an access point, it sends an information packet to the new access point listing
the characteristics of its previous access point. Roaming time decreases when the client recognizes
and uses an access point list built by compiling all previous access points to which each client was
associated and sent (unicast) to the client immediately after association. The access point list
contains the channels, BSSIDs of neighbor access points that support the client's current SSID(s),
and time elapsed since disassociation.
Enhanced neighbor list—This feature focuses on improving a Cisco CX v4 client's roam
experience and network edge performance, especially when servicing voice applications. The access
point provides its associated client information about its neighbors using a neighbor-list update
unicast message.
Roam reason report—This feature enables Cisco CX v4 clients to report the reason why they
roamed to a new access point. It also allows network administrators to build and monitor a roam
history.
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