Cisco Catalyst 9166I Access Point

Overview

Enterprise WiFi 6E (802.11ax) access point with tri-band support (2.4/5/6 GHz). Deployed as C9130AX-01 in home enterprise.

  • Model: CW9166I-B

  • Regulatory Domain: -B (Americas)

  • WiFi Standard: WiFi 6E (802.11ax)

Specifications

Component Specification

WiFi Standard

802.11ax (WiFi 6E)

Frequency Bands

2.4 GHz, 5 GHz, 6 GHz

Max Data Rate

~7.8 Gbps aggregate

Spatial Streams

4x4:4 MU-MIMO (all bands)

Channel Width

Up to 160 MHz (6 GHz)

OFDMA

Yes (uplink and downlink)

BSS Coloring

Yes

Target Wake Time (TWT)

Yes

Ethernet

1x 5GbE (mGig), 1x 1GbE

PoE

802.3bt (PoE++), 30W typical

Mounting

Ceiling, wall, desk

Dimensions

8.6" x 8.6" x 2.1"

Weight

2.5 lbs (1.13 kg)

Radio Configuration

Slot Assignment

Slot Band Notes

0

2.4 GHz

Legacy client support

1

5 GHz

Primary band for most clients

2

6 GHz

Cleanest spectrum, WiFi 6E only

Current Deployment (C9130AX-01)

Band Channel Width Tx Power

2.4 GHz

1

20 MHz

23 dBm

5 GHz

116,120

40 MHz

22 dBm

6 GHz

21 (160 MHz block)

160 MHz

20 dBm

Network Requirements

Switch Port Configuration

interface TenGigabitEthernet1/0/8
 description Cisco CW9166I-B
 switchport access vlan 10
 switchport mode access
 ip arp inspection trust
 spanning-tree portfast edge

Power Requirements

PoE Standard Power

802.3bt (PoE++)

30W typical, 51W max

802.3at (PoE+)

Reduced functionality (limited radios)

802.3af (PoE)

Not supported
Requires PoE++ (802.3bt) for full tri-band operation.

WLC Discovery

Methods (in priority order)

  1. DHCP Option 43 - Vendor-specific TLV (not supported by VyOS)

  2. DHCP Option 138 - CAPWAP standard (AP requests Option 43)

  3. DNS Discovery - CISCO-CAPWAP-CONTROLLER.<domain> ✓

  4. Broadcast discovery - Local subnet only

  5. Static configuration - Manual

DNS-Based Discovery (Recommended for VyOS)

Add A records to BIND:

CISCO-CAPWAP-CONTROLLER    IN    A    10.50.1.40
CISCO-CAPWAP-CONTROLLER    IN    A    10.50.1.41

Reference: CR-2026-03-10 AP Deployment

ISE Integration

Endpoint Identity Group

AP MAC must be in Trusted_Access_Points group for MAB authorization:

netapi ise update-endpoint-group 8C:88:81:2A:00:00 "Trusted_Access_Points"

Authorization Profile

Assigned via Domus_Trusted_APs rule in Domus_MAB policy set.

Comparison: CW9166I vs AP4800

Feature AP4800 (Old) CW9166I (New)

WiFi Standard

WiFi 5 (802.11ac)

WiFi 6E (802.11ax)

Bands

2.4/5 GHz

2.4/5/6 GHz

6 GHz Support

No

Yes (160 MHz)

OFDMA

No

Yes

Max Channel Width

80 MHz

160 MHz

MU-MIMO

4x4 (5 GHz only)

4x4 tri-band

mGig Ethernet

No (1GbE)

Yes (5GbE)

Release Year

~2018

~2022

Support Status

EOL approaching

Current

Deployment Notes

Initial Join Issues (2026-03-10)

  • VyOS Option 138 configured but AP requests Option 43

  • VyOS doesn’t support Cisco vendor Option 43

  • Solution: DNS-based discovery via BIND

AP Rename

netapi wlc run "ap name ap8c88-812a-0000 name C9130AX-01"

Purchasing

Model Numbers

Model Description

CW9166I-B

Internal antennas, -B domain (Americas)

CW9166I-E

Internal antennas, -E domain (EMEA)

CW9166E-B

External antennas, -B domain

Sources

  • Cisco authorized resellers

  • Secondary market (eBay) - enterprise refreshes

  • CDW, SHI, Insight

Approximate Pricing

  • New: $1,200-1,500

  • Used/Refurbished: $400-700

References

Official Documentation

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