Optimized Roaming
In wireless
networks, sometime we noticed that some of the clients stick to far away access
points (from which signals range is weak) even if there is nearby AP which can
provide the good RSSI value. This issue is known as Client Sticky problem.
The sticky
client continues to be connected with low RSSI value from far-away AP, which
will lead to slow speed, more retransmissions, high airtime interference AND
all the clients connected to the same access point will experience the
connectivity problem.
In order to
tackle this issue, Cisco WLC comes up with the new feature known as Optimized Roaming to kick-off the
Sticky client from the far-away AP.
When Optimized Roaming is enabled then data
RSSI packets from the clients are actively monitored and disassociate the
clients when the received RSSI is below the threshold set.
Through Optimized roaming:
1. Client receives best connectivity and
maintains the quality of experience.
Client will be able to join the same AP
when its RSSI is increased by 6dBm; i.e., if earlier reported RSSI was -75dBm
and now RSSI is -69dBm then the client can join the same AP.
We can enable the Optimized roaming on both
the bands that is 2.4GHz as well as 5GHz.
Optimized Roaming Mode - Enable (to enable optimized roaming). By default if is disabled.
Optimized Roaming Interval - This is the time interval at which AP's report to wireless
controller about the client statistics. Default is 90 sec.
Optimized
Roaming Data Rate Threshold - This value sets the
threshold to the clients connected on legacy data rates and uses most of the
Airtime consumption. If leave disable then all Optimized roaming applied to all
clients otherwise to clients connected to lower or equal to set data rate.
I hope
this is been informative to you and I would like to thank you for viewing.
References:
http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-0/hdx_final/b_hdx_dg_final/high_density_experience_features_added_in_release_8_0.html
http://www.revolutionwifi.net/revolutionwifi/2014/08/optimized-roaming-rssi-low-check-rx-sop.html
