Controller Based WLANs

How does the fast-roaming feature work?

The fast-roaming feature is disabled by default, so Aruba OS does not allow a wifi client to associate to more than one AP at a time. When that happens, the old AP sends a deauth frame to the client.

 

When the fast-roaming feature is enabled, a wifi client is allowed to keep multiple associations with multiple APs at a time to help that client with reassociation and roaming from one AP to another.

 

Here is a snapshot of a packet trace in both cases:

 

With fast-roaming 

 

----------- 
Timestamp stype SA DA BSS signal Misc 
--------- ----- -- -- --- ------ ---- 
Nov 29 17:13:26 reassoc-resp 00:0b:86:a0:bb:f0 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 15 Success 
Nov 29 17:13:26 reassoc-req 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 00:0b:86:a0:bb:f0 0 - 
Nov 29 17:13:26 auth 00:0b:86:a0:bb:f0 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 15 Success 
Nov 29 17:13:26 auth 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 00:0b:86:a0:bb:f0 0 Success 
Nov 29 17:12:42 reassoc-resp 00:0b:86:a0:a5:80 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 15 Success 
Nov 29 17:12:42 reassoc-req 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 00:0b:86:a0:a5:80 0 - 
Nov 29 17:12:42 auth 00:0b:86:a0:a5:80 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 15 Success 
Nov 29 17:12:42 auth 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 00:0b:86:a0:a5:80 0 Success 
Nov 29 17:11:36 assoc-resp 00:0b:86:a0:bb:f0 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 15 Success 
Nov 29 17:11:36 assoc-req 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 00:0b:86:a0:bb:f0 0 - 
Nov 29 17:11:36 auth 00:0b:86:a0:bb:f0 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 15 Success 
Nov 29 17:11:36 auth 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 00:0b:86:a0:bb:f0 0 Success
 

 

Without fast-roaming 

 

 

----------- 
Timestamp stype SA DA BSS signal Misc 
--------- ----- -- -- --- ------ ---- 
Nov 29 17:18:49 reassoc-resp 00:0b:86:a0:a5:80 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 15 Success 
Nov 29 17:18:49 deauth 00:0b:86:a0:bb:f0 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 15 -
 <----- The former AP sends a deauth to the client 
Nov 29 17:18:49 reassoc-req 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 00:0b:86:a0:a5:80 0 - 
Nov 29 17:18:49 auth 00:0b:86:a0:a5:80 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 15 Success 
Nov 29 17:18:49 auth 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 00:0b:86:a0:a5:80 0 Success 
Nov 29 17:18:05 assoc-resp 00:0b:86:a0:bb:f0 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 15 Success 
Nov 29 17:18:05 deauth 00:0b:86:a0:a5:80 00:09:5b:a1:24:9d 00:0b:86:a0:a5:80 15 - 
Nov 29 17:18:05 assoc-req 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 00:0b:86:a0:bb:f0 0 - 
Nov 29 17:18:05 auth 00:0b:86:a0:bb:f0 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 15 Success 
Nov 29 17:18:05 auth 00:09:5b:a1:24:9d 00:0b:86:a0:bb:f0 00:0b:86:a0:bb:f0 0 Success

 

 

To enable fast-roaming, use these commands:

 

 

Aruba OS 2.5:

 

 

(A2400) (config) #stm fast-roaming enable

 

(A2400) (config) #end

 

 

Aruba OS 3.x:

 

 

(A800) (config) #wlan virtual-ap default  (A800) (Virtual AP profile "default") #fast-roaming  (A800) (Virtual AP profile "default") #end

 

Version History
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Last update:
‎07-02-2014 08:21 AM
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