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Need to enable optimized Roaming

aniket0422
Level 1
Level 1

Hi All,

We have requirement from client to enable Optimized Roaming.

I am aware that before configuring Optimized Roaming Interval and Optimized Roaming Data Rate Threshold we have to disable 802.11a and 802.11b network. But,

1. what should be ideal value for Optimized Roaming Interval [ Default is 90 ]

2. What should be ideal value for Optimized Roaming Data Rate Threshold from below. Or can we keep it disabled ?

    802.11a—6, 9, 12, 18, 24, 36, 48, and 54.

    802.11b—1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, and 54.

3. How to test is there any improvement in network after configuring Optimized Roaming.

Regards,

Aniket Raut

1 Reply 1

mohanak
Cisco Employee
Cisco Employee

Optimized roaming disassociates clients based on the RSSI of the client data packet and data rate. The client is disassociated if the current data rate of the client is lower than the Optimized Roaming Data Rate Threshold.

Enter a rate of either 6, 9, 12, 18, 24, 36, 48 or 54, or 0 for disable
FeatureDescriptionDefault
Enabling Optimized RoamingOptimized Roaming is disabled by default. It can be enabled per band, meaning it can be enabled on b/g/n, a/ac/n, or both.Disable
Setting the Optimized Roaming threshold parametersThe Optimized Roaming thresholds are shared with the coverage hold detection thresholds.

Here is a description of the three fields used for Optimized Roaming:

  1. Data RSSI value - This is the threshold value to determine if a data packets RSSI value is too low. Packets received at or below this value are considered below the optimized roaming threshold.

  2. Coverage Exception Level Percentage - This marks the percentage of data packets that can be received below the Data RSSI value. If this percentage exceeds, the client will be disassociated.

  3. Number of Data Packets Received - This is the minimum number of packets that must be received to trigger a client disassociation.

By default, the data RSSI value is set to -80 dBm, the coverage exception level is 25%, and the default number of packets is 50.

So by default, if Optimized Roaming is enabled and more than 25% of at least 50 packets in a 5 second period is less than -80 Data RSSI, the AP will disassociate the client once the reporting interval of 90 seconds expires.

-80 dBm / 25% / 50 Packets
Optimized Roaming Interval

The time interval at which the AP reports the client statistics. This value is defaulted to 90 seconds

90
Optimized Roaming Data Rate Threshold

The goal of the Optimized Roaming feature is only to affect clients that are connected on legacy data rates. These are the clients that are using a majority of the Airtime.

This value applies the Optimized Roaming feature to clients connected at this data rate or lower. By default this is disabled, meaning Optimized Roaming is applied to all clients.

Disabled
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