Information About Dual-Band Radio Support
The Dual-Band (XOR) radio in Cisco 2800, 3800, 4800, and the 9120 series AP models offer the ability to serve 2.4–GHz or 5–GHz bands or passively monitor both the bands on the same AP. These APs can be configured to serve clients in 2.4–GHz and 5–GHz bands, or serially scan both 2.4–GHz and 5–GHz bands on the flexible radio while the main 5–GHz radio serves clients.
Cisco APs models up and through the Cisco 9120 APs are designed to support dual 5–GHz band operations with the i model supporting a dedicated Macro/Micro architecture and the e and p models supporting Macro/Macro. The Cisco 9130AXI APs and the Cisco 9136 APs support dual 5-GHz operations as Micro/Messo cell.
When a radio moves between bands (from 2.4-GHz to 5-GHz and vice versa), clients need to be steered to get an optimal distribution across radios. When an AP has two radios in the 5–GHz band, client steering algorithms contained in the Flexible Radio Assignment (FRA) algorithm are used to steer a client between the same band co-resident radios.
The XOR radio support can be steered manually or automatically:
Manual steering of a band on a radio—The band on the XOR radio can only be changed manually.
Automatic client and band steering on the radios is managed by the FRA feature that monitors and changes the band configurations as per site requirements.
RF measurement will not run when a static channel is configured on slot 1. Due to this, the dual band radio slot 0 will move only with 5–GHz radio and not to the monitor mode.
When slot 1 radio is disabled, RF measurement will not run, and the dual band radio slot 0 will be only on 2.4–GHz radio.
Only one of the 5-GHz radios can operate in the UNII band (100 - 144), due to an AP limitation to keep the power budget within the regulatory limit.