Cisco Ultra-Reliable Wireless Backhaul Standalone, Software Configuration Guide, Release 26.2.x
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Cisco Ultra-Reliable Wireless Backhaul Standalone, Software Configuration Guide, Release 26.2.x
Updated: September 28, 2026
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Log inConfigure the operating channel and bandwidth for a dot11Radio interface using CLI commands.
This task configures the operating channel and bandwidth settings for a dot11Radio interface to optimize wireless network performance.
Use this procedure when you need to set specific channel and bandwidth parameters for wireless radio interfaces in your network configuration.
Use the configure dot11Radio interface channel channel-id command to set the operating channel.
Device# configure dot11Radio 1 channel 172Valid channel-id range is from 1 to 256.
Use the configure dot11Radio interface band-width bandwidth command to set the bandwidth.
Device# configure dot11Radio 1 band-width 10Valid bandwidth is 10 MHz.
Use the configure dot11Radio interface maximum-link-length distancedistance {km| miles} command to set the maximum wireless link distance the radio assumes for the dot11 radio interface.
Device# configure dot11Radio 1 maximum-link-length distance 70 km Valid distance is 1-99.
The radio does not actually measure the peer's distance. Instead, it operates on timing assumptions tailored for links up to the configured distance.
Use Cases
Fixed outdoor URWB links
Point-to-point links
Point-to-multipoint fixed infrastructure links
Longer-distance outdoor wireless paths
Impact on Radio Timing and MAC Behavior
The configured maximum-link-length affects timing-sensitive MAC behaviors, including:
ACK timing
Block ACK timing
AMPDU behavior
Long-distance propagation tolerance
Rate-control interpretation of retries and loss
Consequences of Misconfiguration
When the configured distance is set shorter than the physical distance, the radio's timing windows (slots) close before the signal has physical time to travel the distance and return. This causes the radio to prematurely assume the packet was lost, leading to:
Excessive retries
MCS fallback
Lower effective transmit rates
Rate-control getting stuck at a low rate
Example
If the maximum-link-length is configured as 3000 meters, the radio assumes timing suitable for links up to 3000 meters, not that it has measured the peer at 3000 meters.
Proper configuration of this parameter is critical for optimal wireless performance, especially in fixed outdoor point-to-point or point-to-multipoint deployments.
Use the end command to return to privileged EXEC mode.
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