Teach readers how to create and apply radio profiles for 2.4 GHz, 5 GHz, and 6 GHz bands, balancing coverage, capacity, and interference management.

Content Outline

What is a Radio Profile?

• A radio profile defines RF behavior for APs: channels, power, data rates, ARM settings
• Separate profiles for 2.4 GHz, 5 GHz, 6 GHz (Wi-Fi 6E)
• Applied at the group level—all APs in the group inherit the profile​
• Goal: Optimize coverage, minimize interference, maximize performance

Why Radio Configuration Matters

• Out-of-box defaults are conservative (support legacy clients, broad coverage)​
• Modern enterprise networks benefit from tuning:
  • Disable slow data rates (1/2 Mbps) to reduce airtime overhead
  • Use 5/6 GHz for high-density areas (more channels, less interference)
  • Let ARM (Adaptive Radio Management) dynamically optimize channels and power

Understanding Adaptive Radio Management (ARM)

• ARM automatically adjusts AP channels and power based on RF environment
• Monitors: Rogue APs, co-channel interference, client load, noise floor
• Benefits: Self-healing network, reduces manual tuning, adapts to changes
• When to disable ARM: Pre-designed RF plans with fixed channels (rare)
• Recommendation: Enable ARM and trust it—it's very good

Step 1: Access Radio Profile Configuration

• In Central, set context filter to your AP group​
• Navigate to "Manage" > "Devices" > "Access Points"​
• Click the "Config" icon (gear icon, top-right)​
• Click "Wireless" > "Radios" tab​
• You'll see the "RF Coverage" page with existing radio profiles​

Step 2: Create or Edit a Radio Profile

• To edit existing profile: Click the edit icon (pencil) next to the profile​
• To create new profile: Click "+ Add" button​
• Enter a Profile Name (e.g., "Corp-High-Density", "Branch-Standard")​

Step 3: Configure 2.4 GHz Band Settings

Channels:

• Click on "Valid Channels" dropdown
• Best practice: Use channels 1, 6, 11 only (non-overlapping in North America)
• Uncheck other channels (2, 3, 4, 5, 7, 8, 9, 10, 12, 13) to avoid co-channel interference​
• Click "OK"​

Channel Width:

• Recommendation: 20 MHz only for 2.4 GHz
• 40 MHz provides marginal benefit but increases interference​
• Exception: Low-density areas with minimal interference​

Transmit Power:

• Set Min Power: 6-12 dBm (prevents APs from going too low)
• Set Max Power: 18-21 dBm (reduces cell overlap)
• Why limit max power: Larger cells = more interference, worse roaming
• Enable ARM to dynamically adjust within this range

Data Rates (Critical for Performance):

• Minimum Basic Rate: 12 Mbps (disables 1/2/5.5/11 Mbps)
• Why: Legacy rates consume massive airtime; modern clients support 12 Mbps+​
• Impact: Frees up ~5-10% airtime in typical environments​

Step 4: Configure 5 GHz Band Settings

Channels:

• Use all non-DFS channels if possible (36-48, 149-165 in US)
• Include DFS channels (52-144) for more capacity, but expect occasional radar-triggered changes
• High-density: Use as many channels as possible

Channel Width:

• Standard density: 40 MHz or 80 MHz
• High density: 20 MHz or 40 MHz (more channels available)
• Wi-Fi 6/6E: Consider 80 MHz or 160 MHz for maximum throughput

Transmit Power:

• Min Power: 9-12 dBm
• Max Power: 18-24 dBm (higher than 2.4 GHz is okay—5 GHz has better propagation characteristics)
• Enable ARM for dynamic adjustment

Data Rates:

• Minimum Basic Rate: 12 Mbps (6 Mbps for broad compatibility)​
• Beacon Rate: 6 Mbps (lowest rate, ensures beacon coverage)​

Step 5: Configure 6 GHz Band Settings (Wi-Fi 6E)

• Only if you have Wi-Fi 6E APs (e.g., AP-635, AP-655)​
• Channels: Use all available 6 GHz channels (59 channels total in US!)
• Channel Width: 80 MHz or 160 MHz (6 GHz was designed for high throughput)
• Transmit Power: Similar to 5 GHz (9-24 dBm)​
• Data Rates: Minimum 6 Mbps (6 GHz doesn't support legacy rates anyway)​

Step 6: Enable ARM (Adaptive Radio Management)

• In the radio profile, locate "ARM" settings
• Enable ARM: Check the box
• ARM will:
  • Monitor interference and neighbor APs
  • Automatically select best channels
  • Adjust power to minimize co-channel interference
  • React to radar events on DFS channels
• ARM scan interval: Default is fine (leave as-is)​
• ARM sensitivity: Leave at default unless you have specific RF design​

Step 7: Apply Radio Profile to APs

• After configuring the profile, click "Save" or "Apply"​
• Central pushes the configuration to all APs in the group​
• Verification:
  • Go to "Audit Trail" and check for "Radio Profile applied successfully"
  • Go to individual AP > "RF" tab to view active channels and power levels

Advanced Settings (Optional)

Band Steering:

• Encourages dual-band clients to use 5 GHz instead of 2.4 GHz
• Enable: Recommended for mixed environments​
• Mode: Prefer 5 GHz (default)​

Client Match:

• Aruba's proprietary algorithm for optimal AP-client pairing​
• Enable: Recommended (improves roaming and load balancing)​

Airtime Fairness:

• Prevents slow clients from monopolizing airtime​
• Enable: Recommended in high-density environments​

Common Radio Configuration Mistakes

Mistake	Impact	Fix
Leaving 1/2 Mbps rates enabled	Wastes airtime, slows network​	Set minimum to 12 Mbps​
Using 40 MHz on 2.4 GHz	Massive interference, slower performance​	Use 20 MHz only​
Max power set too high	Co-channel interference, poor roaming	Cap at 18-21 dBm for 2.4 GHz​
Disabling ARM	Manual channel planning can't adapt to changes	Enable ARM and trust it
Overlapping 2.4 GHz channels	Doubles interference	Use 1, 6, 11 only​

Verifying RF Performance

• In Central, go to AP > "RF" tab​
• Check:
  • Current Channel: Should be within your allowed channels​
  • Transmit Power: Should be within your min/max range​
  • Channel Utilization: <50% is good, >70% indicates congestion​
  • Noise Floor: <-85 dBm is excellent, >-75 dBm indicates interference​

🧠 Lionel's Tip: The 80/20 of Radio Tuning
🧠 Here's the truth: Disable 1/2 Mbps rates and enable ARM. That's 80% of RF optimization. The other 20%—fancy channel planning, power maps, predictive models—matters in stadiums and convention centers, but for 95% of deployments, ARM + modern rate limits is all you need. I've seen networks with meticulously designed "fixed channel plans" perform worse than ARM because someone moved a microwave or added a rogue AP. ARM adapts; spreadsheets don't.

What We Accomplished
✅ Created custom radio profiles for 2.4 GHz and 5 GHz bands
✅ Configured channels, power, and data rates for optimal performance
✅ Enabled ARM (Adaptive Radio Management) for dynamic optimization
✅ Applied radio profiles to all APs in the group
✅ Verified RF settings via AP details and RF tab
✅ Understand the impact of rate limits and channel selection

Next Week: The moment you've been waiting for—we'll create our first SSID! We'll configure security (WPA2-PSK or WPA3-Enterprise), assign VLANs, and push the SSID live. By the end of Week 7, you'll have a working wireless network.