Motorola WS5100 User Manual

Page of 364
Network Setup   
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8. Optionally select one of the following from within the 
Fast Roaming (8021x only)
 field. 
9. Refer to the 
Status
 field for the current state of the requests made from applet. This field displays error 
messages if something goes wrong in the transaction between the applet and the switch.
10.Click 
OK 
to use the changes to the running configuration and close the dialog.
11.Click 
Cancel 
to close the dialog without committing updates to the running configuration.
4.5.2 Viewing WLAN Statistics
The 
Statistics
 screen displays read-only statistics for each WLAN. Use this information to assess if 
configuration changes are required to improve network performance. If a more detailed set of WLAN 
statistics is required, select a WLAN from the table and click the 
Details 
button.
To view WLAN configuration details:
1. Select 
Network
 > 
Wireless LANs
 from the main menu tree.
PMK Caching
Select Pairwise Master Key (PMK) caching to create a shared key between a client device 
and its authenticator. When a client roams between devices, the clients credentials no 
longer must be completely reauthenticated (a process that can take up to 100 milliseconds). 
In the instance of a voice session, the connection would likely be terminated if not using a 
PMK. PMK cache entries are stored for a finite amount of time, as configured on the wireless 
client.
Opportunistic Key 
Caching
Opportunistic Key Caching
 allows the switch to use a PMK derived with a client on one 
access port with the same client when it roams over to another access port. Upon roaming 
the client does not have to do 802.1x authentication and can start sending/receiving data 
sooner.
Pre-Authentication
Selecting the 
Pre-Authentication 
option enables an associated MU to carry out an 802.1x 
authentication with another switch (or device) before it roams to it. The switch caches the 
keying information of the client until it roams to the other switch. This enables the roaming 
client to send and receive data sooner by not having to conduct an802.1x authentication after 
roaming. This is only supported when 802.1x EAP authentication is enabled.