smart-roam roam-threshold { snr | rate }

Function

The smart-roam roam-threshold { snr | rate } command sets the smart roaming threshold.

The undo smart-roam roam-threshold command restores the default smart roaming threshold.

By default, the SNR threshold for smart roaming is 20 dB, and the rate threshold is 20%.

Format

smart-roam roam-threshold { snr snr-threshold | rate rate-threshold }

undo smart-roam roam-threshold { snr | rate }

Parameters

Parameter	Description	Value
snr snr-threshold	Specifies the SNR threshold for smart roaming. If the SNR threshold is 25 dB and noise floor is -95 dBm, a STA's SNR is lower than the threshold when the STA's RSSI is lower than -70 dBm (25 dB + (-95 dBm) = -70 dBm).	The value is an integer that ranges from 15 to 45, in dB.
rate rate-threshold	Specifies the rate threshold for smart roaming. The rate here refers to the negotiated rate based on the protocol and signal strength when a STA associates with an AP, instead of the actual rate of the STA. If the maximum capability of the AP and STA is 54 Mbit/s and the rate threshold is 50%, the lower rate threshold is considered 27 Mbit/s (54 Mbit/s x 50% = 27 Mbit/s).	The value is an integer that ranges from 1 to 100, in percentage.

Parameter

Description

Value

snr snr-threshold

Specifies the SNR threshold for smart roaming.

If the SNR threshold is 25 dB and noise floor is -95 dBm, a STA's SNR is lower than the threshold when the STA's RSSI is lower than -70 dBm (25 dB + (-95 dBm) = -70 dBm).

The value is an integer that ranges from 15 to 45, in dB.

rate rate-threshold

Specifies the rate threshold for smart roaming.

The rate here refers to the negotiated rate based on the protocol and signal strength when a STA associates with an AP, instead of the actual rate of the STA.

If the maximum capability of the AP and STA is 54 Mbit/s and the rate threshold is 50%, the lower rate threshold is considered 27 Mbit/s (54 Mbit/s x 50% = 27 Mbit/s).

The value is an integer that ranges from 1 to 100, in percentage.

Views

RRM profile view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

After the smart roaming function is enabled, the AP forces STAs to log out based on the configured trigger mode and threshold of smart roaming. When an AP receives a STA's data packet, the AP learns the STA's SNR or rate from the data packet. If the STA's SNR or rate is lower than the configured threshold, smart roaming is triggered. Then, the AP sends a Disassociation frame to the STA so that the STA can reinitiate a connection with the AP or roam to another AP with strong signals.

A large threshold may cause STAs to go offline frequently.
A small threshold may disable STAs from roaming to an AP with stronger signals.

Prerequisites

The smart roaming function has been enabled using the undo smart-roam disable command.

The trigger mode of smart roaming has been configured using the smart-roam roam-threshold { check-snr | check-rate } command.

Precautions

STAs may be forced to go offline through the smart roaming function or the function of quickly disconnecting STAs. If the SNR-based thresholds for the two functions are both configured, the function with a larger value is preferentially effective.

Example

# Set the trigger mode of smart roaming to check-snr and set the smart roaming threshold to 25 dB.

<HUAWEI> system-view
[HUAWEI] wlan
[HUAWEI-wlan-view] rrm-profile name huawei
[HUAWEI-wlan-rrm-prof-huawei] undo smart-roam disable
[HUAWEI-wlan-rrm-prof-huawei] smart-roam roam-threshold check-snr
[HUAWEI-wlan-rrm-prof-huawei] smart-roam roam-threshold snr 25