Cisco Catalyst 9117AX Series Getting Started Manual

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GETTING STARTED GUIDE

Cisco Catalyst 9120AX Series Access

Points

First Published: June 21, 2019

Last Updated: July 04, 2019

Cisco Catalyst 9120AX Series Access Points

1 About this Guide

2 About the Access Point

3 Safety Instructions

4 Unpacking

5 AP Views, Ports, and Connectors

6 Preparing the AP for Installation

7 Installation Overview

8 Performing a Pre-Installation Configuration

9 Mounting the Access Point

10 Powering the Access Point

11 Configuring and Deploying the Access Point

12 Checking the Access Point LEDs

13 Miscellaneous Usage and Configuration Guidelines

15 Related Documentation

16 Declarations of Conformity and Regulatory Information

Communications, Services, and Additional Information

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Cisco Catalyst 9120AX Series Access Points

1 About this Guide

This guide provides instructions on how to install your Cisco Catalyst 9120AX series access points and provides links to

resources which can help you configure the access point. This guide provides mounting instructions and limited

troubleshooting procedures.

The 9120AX series access point is referred to as access point or AP in this document.

2 About the Access Point

The Cisco Catalyst 9120AX series wireless access point is a dual band, dual concurrent, enterprise 802.11ax (Wi-Fi 6)

AP. This AP series has integrated antennas designed to use both 2.4 GHz and the 5 GHz bands. This access point

supports a greater overall High Density Experience (HDX) which provides a more predictable performance for advanced

applications such as 4K or 8K video, high-density and high-definition collaboration applications, all-wireless offices and

Internet-of-Things (IoT). The access point supports full interoperability with leading 802.11ax and 802.11ac clients, and

supports a mixed deployment with other access points and controllers. These APs provide integrated security, resiliency

and operational flexibility as well as increased network intelligence.

A full listing of the access point's features and specifications are provided in the Cisco Catalyst 9120AX Series Access

Point Data Sheet, at the following URL:

https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9120ax-series-access-points/datasheet-c78-7

42115.html

Access Point Features

The 9120AX series access point is a wireless controller-based product and supports:

 Four dual-band integrated antennas on the 9120AXI access point models (C9120AXI-x and C9120AXI-ME-x)

Note The ‘x’ in the model numbers represents the regulatory domain. For information on supported regulatory

domains, see the“AP Model Numbers and Regulatory Domains” section on page 5.

 Integrated internal antennas, omni directional in azimuth for both 2.4 GHz and 5 GHz

 Four radios, a dual band radio with 2.4 GHz (peak gain 4dBi) and 4x4 5 GHz (peak gain 5dBi), a single band 5 GHz

(peak gain 5dBi), an omni IoT radio 2.4 GHz (peak gain 3dBi) that can be used with BLE, Zigbee, Thread and other

multi-protocol 802.15.4 devices, and an auxiliary radio with 2.4 GHz (peak gain 3dBi) and 5 GHz (peak gain 5dBi)

 Simultaneous 4x4 MIMO with four spatial streams for both 2.4 GHz and 5 GHz bands

 Multiuser Multiple-Input Multiple-Output (MU-MIMO) technology with 4 spatial streams for downlink.

 Orthogonal Frequency Division Multiple Access (OFDMA)-based scheduling for both downlink and uplink

 The following hardware external interfaces:

— 1x100/1000/2500 Multigigabit Ethernet (RJ-45)

— RS-232 Console Interface through RJ-45

— Recovery push button (enables partial or full system configuration recovery)

— USB 2.0 Port

Cisco Catalyst 9120AX Series Access Points

— One multi-color LED Status indicator. see the “Checking the Access Point LEDs” section on page 14 for

information on the colors of the LED status indicator.

 Integrated Bluetooth Low Energy (BLE) radio to enable IoT use cases such as location tracking and wayfinding.

 Cisco RF ASIC, a fully integrated Software Defined Radio (SDR), that can perform advanced RF spectrum analysis

and delivers features like CleanAir, Wireless Intrusion Prevention System (WIPS), and DFS detection.

 Intelligent Capture probes the network and provides Cisco DNA Center with deep analysis.

 Spatial Reuse (also known as Basic Service Set (BSS) coloring) which allows APs and their clients to differentiate

between BSSs, thus permitting more simultaneous transmissions.

 New power savings mode called Target Wake Time (TWT) which allows the client to stay asleep and wake up only

at pre-scheduled (target) times to exchange data with the AP. This provides significant energy savings for

battery-operated devices.

 Cisco Digital Network Architecture (DNA) support enables Cisco Connected Mobile Experiences, Apple FastLane

and Cisco Identity Services Engine.

 Cross-AP Noise Reduction, a Cisco innovation that enables APs to intelligently collaborate in real time about RF

conditions so that users connect with optimized signal quality and performance.

 Optimized AP Roaming for ensuring that client devices associate with the AP in their coverage range that offers the

fastest data rate available.

 Cisco CleanAir technology enhanced with 160MHz channel support. CleanAir delivers proactive, high-speed

spectrum intelligence across 20-, 40-, and 80-, and 160-MHz-wide channels to combat performance problems

arising from wireless interference.

 MIMO equalization capabilities, which optimize uplink performance and reliability by reducing the impact of signal

fade.

The AP supports the following operating modes:

 Local—This is the default mode for the Cisco AP. In this mode, the AP serves clients.

 FlexConnect—FlexConnect mode for the Cisco AP.

 Monitor—This is the monitor-only mode for the Cisco AP.

 Sniffer—In the wireless sniffer mode, the AP starts sniffing the air on a given channel. It captures and forwards all the

packets from the clients on that channel to a remote machine that runs Airopeek or Wireshark (packet analyzers for

IEEE 802.11 wireless LANs). This includes information on the time stamp, signal strength, packet size, etc.

Note In the sniffer mode, the server to which the data is sent should be on the same VLAN as the wireless

controller management VLAN otherwise an error will be displayed.

Guidelines and Restrictions for Cisco 802.11ax Access Points

 The APs do not support Mobility Express on Cisco AireOS or Cisco IOS-XE platforms.

Cisco Catalyst 9120AX Series Access Points

AP Model Numbers and Regulatory Domains

You need to verify whether the AP model you have is approved for use in your country. To verify approval and to identify

the regulatory domain that corresponds to a particular country, visit http://www.cisco.com/go/aironet/compliance. Not

all regulatory domains have been approved. As and when they are approved, this compliance list will be updated.

Antennas and Radios

The 9120AX series access point has four internal dual-band antennas with a dedicated 2.4 GHz radio and a 5 GHz radio,

four internal single-band antennas with a dedicated 5 GHz radio, one internal single-band antenna with a dedicated

2.4 GHz IOT radio, and one dual-band antenna with a dedicated 2.4 GHz radio and a 5 GHz AUX radio.

The access point configurations are:

 C9120AXI-x—Four radios, a dual band radio with 2.4 GHz (peak gain 4dBi) and 4x4 5 GHz (peak gain 5dBi), a single

band 5 GHz (peak gain 5dBi), an omni IoT radio 2.4 GHz (peak gain 3dBi) that can be used with BLE, Zigbee, Thread

and other multi-protocol 802.15.4 devices, and an auxiliary radio with 2.4 GHz (peak gain 3dBi) and 5 GHz (peak

gain 5dBi).

 C9120AXI-ME-x—Four radios, a dual band radio with 2.4 GHz (peak gain 4dBi) and 4x4 5 GHz (peak gain 5dBi), a

single band 5 GHz (peak gain 5dBi), an omni IoT radio 2.4 GHz (peak gain 3dBi) that can be used with BLE, Zigbee,

Thread and other multi-protocol 802.15.4 devices, and an auxiliary radio with 2.4 GHz (peak gain 3dBi) and 5 GHz

(peak gain 5dBi).

3 Safety Instructions

Translated versions of the following safety warnings are provided in the translated safety warnings document that is

shipped with your access point. The translated warnings are also in the Translated Safety Warnings for Cisco Catalyst

Access Points, which is available on Cisco.com.

Warning

IMPORTANT SAFETY INSTRUCTIONS

This warning symbol means danger. You are in a situation that could cause bodily injury. Before you

work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with

standard practices for preventing accidents. Use the statement number provided at the end of each

warning to locate its translation in the translated safety warnings that accompanied this device.

SAVE THESE INSTRUCTIONS

Statement 1071

Warning

Read the installation instructions before using, installing or connecting the system to the power source.

Statement 1004

AP Type Model Number Details

Access Point for indoor

environments, with internal

antennas

C9120AXI-x Dual-band, controller-based 802.11ax

C9120AXI-ME-x Dual-band, 802.11ax with a Cisco Mobility

Express software image

Cisco Catalyst 9120AX Series Access Points

Warning

Installation of the equipment must comply with local and national electrical codes.

Statement 1074

Warning

In order to comply with FCC radio frequency (RF) exposure limits, antennas should be located at a

minimum of 12 inches (30 cm) or more from the body of all persons.

Statement 332

Warning

Ultimate disposal of this product should be handled according to all national laws and regulations.

Statement 1040

Warning

The access point, antennas, and all interconnected equipment including the associated LAN

connections must be located indoors within the same building.

Statement 375

Warning

This equipment is suitable for use in environment air spaces (plenums) in accordance with Section

300.22 (C) of the National Electrical Code, and Sections 2-128, 12-010(3) and 12-100 of the Canadian

Electrical Code, Part 1, CSA C22.2. External power supply, power adapter and/or power injector, if

provided, are not suitable for installation in air spaces.

Statement 440

4 Unpacking

To unpack the access point, follow these steps:

Step 1 Unpack and remove the access point and the accessory kit from the shipping box.

Step 2 Return any packing material to the shipping container and save it for future use.

Step 3 Verify that you have received the items listed below. If any item is missing or damaged, contact your Cisco

representative or reseller for instructions.

— The access point

— Mounting bracket (AIR-AP-BRACKET-1=, selected when you ordered the access point)

— Adjustable ceiling-rail clip (selected when you ordered the access point)

— Power Injector AIR-PWRINJ6= (only if selected when you ordered the access point).

Cisco Catalyst 9120AX Series Access Points

5 AP Views, Ports, and Connectors

Figure 1 Face of the 9120AXI Model

Status LED

USB 2.0 port

Location of the ports and connectors on the

head of the AP.

Cisco Catalyst 9120AX Series Access Points

Figure 2 Ports and Connectors on the Head of the 9120AXI Model

2.5GbE port

Mode button

RJ-45 console port

Security hasp for padlocking AP to mounting

bracket

USB 2.0 port.

Cisco Catalyst 9120AX Series Access Points

6 Preparing the AP for Installation

Before you mount and deploy your access point, we recommend that you perform a site survey (or use the site planning

tool) to determine the best location to install your access point.

You should have the following information about your wireless network available:

 Access point locations.

 Access point mounting options: below a suspended ceiling, on a flat horizontal surface, or on a desk top.

Note You can mount the access point above a suspended ceiling but you must purchase additional mounting

hardware: See “Mounting the Access Point” section on page 12 for additional information.

 Access point power options: 802.3at (PoE+) (Cisco Power Injector AIR-PWRINJ6=) or 802.3af (Cisco Power Injector

AIR-PWRINJ5=).

Note If 802.3af is used, both the 2.4 GHz and 5 GHz radios will be reduced to 1x1 and Ethernet will be

downgraded to 1 GbE. The USB port will also be off.

 Operating temperature: 32°—122°F (0°—50°C)

Note When installing the access point in an environment where the ambient temperature is in the range of

104

°—122°F (>40°—50°C), the access point must be configured to 2x2 on both the 2.4 GHz and 5 GHz

radios, 1GbE Ethernet. Also, there should be no load on the USB port.

Cisco recommends that you make a site map showing access point locations so that you can record the device MAC

addresses from each location and return them to the person who is planning or managing your wireless network.

7 Installation Overview

Installing the access point involves these operations:

Step 1 Performing a Pre-Installation Configuration, page 10 (optional)

Step 2 Mounting the Access Point, page 12

Step 3 Powering the Access Point, page 13

Step 4 Preparing the AP for Installation, page 9

Cisco Catalyst 9120AX Series Access Points

8 Performing a Pre-Installation Configuration

The following procedures ensure that your access point installation and initial operation go as expected. This procedure

is optional.

Note Performing a pre-installation configuration is an optional procedure. If your network controller is properly

configured, you can install your access point in its final location and connect it to the network from there.

See the “Deploying the Access Point on the Wireless Network” section on page 14 for details.

The pre-installation configuration setup is illustrated in Figure 3.

Figure 3 Pre-Installation Configuration Setup

To perform pre-installation configuration, perform the following steps:

Step 1 Make sure that the Cisco Wireless Controller DS port is connected to the network. Use the procedure for CLI

or web-browser interface as described in the appropriate Cisco Wireless Controller guide.

a. Make sure that access points have Layer 3 connectivity to the Cisco Wireless Controller Management and

AP-Manager Interface.

b. Configure the switch to which your access point is to attach. See the Cisco Wireless Controller Configuration

Guide for the release you are using, for additional information.

c. Set the Cisco Wireless Controller as the master so that new access points always join with it.

Cisco Catalyst 9120AX Series Access Points

d. Make sure DHCP is enabled on the network. The access point must receive its IP address through DHCP.

Note An 802.11ax Cisco AP will be assigned an IP address from the DHCP server only if a default router

(gateway) is configured on the DHCP server (enabling the AP to receive its gateway IP address) and the

gateway ARP is resolved.

e. CAPWAP UDP ports must not be blocked in the network.

f. The access point must be able to find the IP address of the controller. This can be accomplished using DHCP,

DNS, or IP subnet broadcast. This guide describes the DHCP method to convey the controller IP address. For

other methods, refer to the product documentation. See also the “Configuring DHCP Option 43” section on

page 17 for more information.

Note The access point requires a gigabit Ethernet (GbE) link to prevent the Ethernet port from becoming a

bottleneck for traffic because wireless traffic speeds exceed transmit speeds of a 10/100 Ethernet port.

Step 2 Apply power to the access point. See Powering the Access Point, page 13.

a. As the access point attempts to connect to the controller, the LEDs cycle through a green, red, and blue

sequence, which can take up to 5 minutes.

Note If the access point remains in this mode for more than five minutes, the access point is unable to find the

Master Cisco Wireless Controller. Check the connection between the access point and the Cisco Wireless

Controller and be sure that they are on the same subnet.

b. If the access point shuts down, check the power source.

c. After the access point finds the Cisco Wireless Controller, it attempts to download the new operating system

code if the access point code version differs from the Cisco Wireless Controller code version. While this is

happening, the Status LED blinks blue.

d. If the operating system download is successful, the access point reboots.

Step 3 Configure the access point if required. Use the controller CLI, controller GUI, or Cisco Prime Infrastructure

to customize the access-point-specific 802.11ac network settings.

Step 4 If the pre-installation configuration is successful, the Status LED is green indicating normal operation.

Disconnect the access point and mount it at the location at which you intend to deploy it on the wireless

network.

Step 5 If your access point does not indicate normal operation, turn it off and repeat the pre-installation

configuration.

Note When you are installing a Layer 3 access point on a different subnet than the Cisco Wireless

Controller, be sure that a DHCP server is reachable from the subnet on which you will be installing

the access point, and that the subnet has a route back to the Cisco Wireless Controller. Also be sure

that the route back to the Cisco Wireless Controller has destination UDP ports 5246 and 5247 open

for CAPWAP communications. Ensure that the route back to the primary, secondary, and tertiary

controller allows IP packet fragments. Finally, be sure that if address translation is used, that the

access point and the Cisco Wireless Controller have a static 1-to-1 NAT to an outside address. (Port

Address Translation is not supported.)

Cisco Catalyst 9120AX Series Access Points

9 Mounting the Access Point

Cisco Catalyst 9120AX series access points can be mounted in several configurations – on a suspended ceiling, on a

hard ceiling or wall, on an electrical or network box, and above a suspended ceiling.

For access point mounting instructions, go to the following URL:

http://www.cisco.com/c/en/us/td/docs/wireless/access_point/mounting/guide/apmount.html

The standard mounting hardware supported by the AP is listed in Table 1.

When mounting the AP in areas where there is a possibility of the AP being knocked off the mounting bracket, use the

lock hasp on the back of the AP (see Figure 4) to lock it to the bracket.

Figure 4 Locking the AP to the Bracket

Table 1 Brackets and Clips for Mounting the AP

Part Number Description

Brackets

123

1. Mount the AP using no less than four screw holes on a bracket.

2. AIR-AP-BRACKET-3 is not compatible for use with Cisco Catalyst 9120AX series access points.

3. You can also use “in-tile” mounting options available from third parties. For more information, visit the

access point data sheet available on Cisco.com at

https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9100ax-access-points/guide-c07-

742311.html.

AIR-AP-BRACKET-1 Low-profile bracket

(This is the default option)

AIR-AP-BRACKET-2 Universal bracket

Clips AIR-AP-T-RAIL-R Ceiling Grid Clip (Recessed mounting)

(This is the default option)

AIR-AP-T-RAIL-F Ceiling Grid Clip (Flush mounting)

AIR-CHNL-ADAPTER Optional adapter for channel-rail ceiling grid profile.

Position of the hasps for the locks on the back of the 9120AXI model

Cisco Catalyst 9120AX Series Access Points

10 Powering the Access Point

The AP can be powered only through Power-over-Ethernet (PoE) using the following:

 802.3at (PoE+): Any 802.3at (30.0 W) compliant switch port or Cisco Power Injector AIR-PWRINJ6=

 802.3af: Any 802.3af (15.4 W) compliant switch port or Cisco Power Injector AIR-PWRINJ5=

Note If 802.3af is used, both the 2.4 GHz and 5 GHz radios will be reduced to 1x1 and Ethernet will be

downgraded to 1 GbE. The USB port will also be off.

11 Configuring and Deploying the Access Point

This section describes how to connect the access point to a controller. Because the configuration process takes place

on the controller, see the Cisco Wireless Controller Configuration Guide for additional information.

The Controller Discovery Process

Note • The controller must be running release 8.9.111.0 as it supports 9120AX series access points. For more

information, visit the access point data sheet available on Cisco.com at

https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9100ax-access-points/guide-c07-742311.

html.

• You cannot edit or query any access point using the controller CLI if the name of the access point contains

a space.

• Make sure that the controller is set to the current time. If the controller is set to a time that has already

occurred, the access point might not join the controller because its certificate may not be valid for that

time.

Access points must be discovered by a controller before they can become an active part of the network. The access

point supports these controller discovery processes:

 Locally stored controller IP address discovery—If the access point was previously joined to a controller, the IP

addresses of the primary, secondary, and tertiary controllers are stored in the access point non-volatile memory. This

process of storing controller IP addresses on an access point for later deployment is called priming the access point.

For more information about priming, see the “Performing a Pre-Installation Configuration” section on page 10.

 DHCP server discovery—This feature uses DHCP option 43 to provide controller IP addresses to the access points.

Cisco switches support a DHCP server option that is typically used for this capability. For more information about

DHCP option 43, see the “Configuring DHCP Option 43” section on page 17.

 DNS discovery—The access point can discover controllers through your domain name server (DNS). For the access

point to do so, you must configure your DNS to return controller IP addresses in response to

CISCO-CAPWAP-CONTROLLER.localdomain, where localdomain is the access point domain name. Configuring the

CISCO-CAPWAP-CONTROLLER provides backwards compatibility in an existing customer deployment. When an

access point receives an IP address and DNS information from a DHCP server, it contacts the DNS to resolve

CISCO-CAPWAP-CONTROLLER.localdomain. When the DNS sends a list of controller IP addresses, the access

point sends discovery requests to the controllers.

Cisco Catalyst 9120AX Series Access Points

Deploying the Access Point on the Wireless Network

After you have mounted the access point, follow these steps to deploy it on the wireless network:

Step 1 Connect and power up the access point.

Step 2 Observe the access point LED (for LED descriptions, see “Checking the Access Point LEDs” section on

page 14).

a. When you power up the access point, it begins a power-up sequence that you can verify by observing the

access point LED. If the power-up sequence is successful, the discovery and join process begins. During this

process, the LED blinks sequentially green, red, and off. When the access point has joined a controller, the

LED is chirping green if no clients are associated or green if one or more clients are associated.

b. If the LED is not on, the access point is most likely not receiving power.

c. If the LED blinks sequentially for more than 5 minutes, the access point is unable to find its primary,

secondary, and tertiary Cisco Wireless Controller. Check the connection between the access point and the

Cisco Wireless Controller, and be sure the access point and the Cisco Wireless Controller are either on the

same subnet or that the access point has a route back to its primary, secondary, and tertiary Cisco Wireless

Controller. Also, if the access point is not on the same subnet as the Cisco Wireless Controller, be sure that

there is a properly configured DHCP server on the same subnet as the access point. See the “Configuring

DHCP Option 43” section on page 17 for additional information.

Step 3 Reconfigure the Cisco Wireless Controller so that it is not the master.

Note A master Cisco Wireless Controller should be used only for configuring access points and not in a

working network.

12 Checking the Access Point LEDs

The location of the access point status LED is shown in Figure 2.

Note Regarding LED status colors, it is expected that there will be small variations in color intensity and hue from

unit to unit. This is within the normal range of the LED manufacturer’s specifications and is not a defect.

However, the intensity of the LED can be changed through the controller.

The access point status LED indicates various conditions and are described in Table 2.

Table 2 LED Status Indications

Message Type LED State Message Meaning

Association status Green Normal operating condition, but no

wireless client associated

Blue Normal operating condition, at least one

wireless client association

Boot loader status Green Executing boot loader

Boot loader error Blinking Green Boot loader signing verification failure

Cisco Catalyst 9120AX Series Access Points

13 Miscellaneous Usage and Configuration Guidelines

Using the Mode Button

Using the Mode button (see Figure 2) you can:

 Reset the AP to the default factory-shipped configuration.

 Clear the AP internal storage, including all configuration files.

To use the mode button, press, and keep pressed, the mode button on the access point during the AP boot cycle. Wait

until the AP status LED changes to Blue. During this, the AP console shows a seconds counter, counting the number of

seconds the mode button is pressed. Then:

 To reset the AP to the default factory-shipped configuration, keep the mode button pressed for less than 20

seconds. The AP configuration files are cleared.

This resets all configuration settings to factory defaults, including passwords, WEP keys, the IP address, and the

SSID.

 To clear the AP internal storage, including all configuration files and the regulatory domain configuration, keep the

mode button pressed for more than 20 seconds, but less than 60 seconds.

The AP status LED changes from Blue to Red, and all the files in the AP storage directory are cleared.

If you keep the mode button pressed for more than 60 seconds, the mode button is assumed faulty and no changes are

made.

Troubleshooting the Access Point to Cisco Controller Join Process

Note Ensure that your controller is running controller software Release 8.9.111.0 or later as specified in see the

Cisco Wireless Solutions Software Compatibility Matrix.

Access points can fail to join a controller for many reasons: a RADIUS authorization is pending; self-signed certificates

are not enabled on the controller; the access point and the controller regulatory domains don’t match, and so on.

Controller software enables you to configure the access points to send all CAPWAP-related errors to a syslog server.

You do not need to enable any debug commands on the controller because all of the CAPWAP error messages can be

viewed from the syslog server itself.

Operating status Blinking Blue Software upgrade in progress

Alternating between Green and

Red

Discovery/join process in progress

Cycling through

Red-Off-Green-Off-Blue-Off

Access point location command invoked

from controller web interface.

Access point operating

system errors

Cycling through

Blue-Red-Green-Off

General warning; insufficient inline power

Table 2 LED Status Indications (continued)

Message Type LED State Message Meaning

Cisco Catalyst 9120AX Series Access Points

The state of the access point is not maintained on the controller until it receives a CAPWAP join request from the access

point. Therefore, it can be difficult to determine why the CAPWAP discovery request from a certain access point was

rejected. In order to troubleshoot such joining problems without enabling CAPWAP debug commands on the controller,

the controller collects information for all access points that send a discovery message to it and maintains information for

any access points that have successfully joined it.

The controller collects all join-related information for each access point that sends a CAPWAP discovery request to the

controller. Collection begins with the first discovery message received from the access point and ends with the last

configuration payload sent from the controller to the access point.

When the controller is maintaining join-related information for the maximum number of access points, it does not collect

information for any more access points.

An access point sends all syslog messages to IP address 255.255.255.255 by default when any of the following

conditions are met:

 An access point running software release 8.2.110.0 or later has been newly deployed.

 An existing access point running software release 8.2.110.0 or later has been reset after clearing the configuration.

If any of these conditions are met and the access point has not yet joined a controller, you can also configure a DHCP

server to return a syslog server IP address to the access point using option 7 on the server. The access point then starts

sending all syslog messages to this IP address.

When the access point joins a controller for the first time, the controller sends the global syslog server IP address (the

default is 255.255.255.255) to the access point. After that, the access point sends all syslog messages to this IP address

until it is overridden by one of the following scenarios:

 The access point is still connected to the same controller, and the global syslog server IP address configuration on

the controller has been changed using the config ap syslog host global syslog_server_IP_address command. In

this case, the controller sends the new global syslog server IP address to the access point.

 The access point is still connected to the same controller, and a specific syslog server IP address has been

configured for the access point on the controller using the config ap syslog host specific Cisco_AP

syslog_server_IP_address command. In this case, the controller sends the new specific syslog server IP address

to the access point.

 The access point is disconnected from the controller and joins another controller. In this case, the new controller

sends its global syslog server IP address to the access point.

 Whenever a new syslog server IP address overrides the existing syslog server IP address, the old address is erased

from persistent storage, and the new address is stored in its place. The access point also starts sending all syslog

messages to the new IP address provided the access point can reach the syslog server IP address.

You can configure the syslog server for access points and view the access point join information only from the controller

CLI.

Important Information for Controller-based Deployments

Keep these guidelines in mind when you use 9120AX series access point:

 The access point can only communicate with Cisco wireless controllers.

 The access point does not support Wireless Domain Services (WDS) and cannot communicate with WDS devices.

However, the controller provides functionality equivalent to WDS when the access point joins it.

 CAPWAP does not support Layer 2. The access point must get an IP address and discover the controller using Layer

3, DHCP, DNS, or IP subnet broadcast.

Cisco Catalyst 9120AX Series Access Points

 The access point console port is enabled for monitoring and debug purposes. All configuration commands are

disabled when the access point is connected to a controller.

Configuring DHCP Option 43

You can use DHCP Option 43 to provide a list of controller IP addresses to the access points, enabling them to find and

join a controller.

The following is a DHCP Option 43 configuration example on a Windows 2003 Enterprise DHCP server for use with Cisco

Catalyst lightweight access points. For other DHCP server implementations, consult product documentation for

configuring DHCP Option 43. In Option 43, you should use the IP address of the controller management interface.

Note DHCP Option 43 is limited to one access point type per DHCP pool. You must configure a separate DHCP

pool for each access point type.

The 9120AX series access point uses the type-length-value (TLV) format for DHCP Option 43. DHCP servers must be

programmed to return the option based on the access point DHCP Vendor Class Identifier (VCI) string (DHCP Option 43).

The VCI string for the 9120AX series access point is:

Cisco AP C9120AX

The format of the TLV block is listed below:

 Type—0xf1 (decimal 241)

 Length—Number of controller IP addresses * 4

 Value—IP addresses of the WLC management interfaces listed sequentially in hex

To configure DHCP Option 43 in the embedded Cisco IOS DHCP server, follow these steps:

Step 1 Enter configuration mode at the Cisco IOS CLI.

Step 2 Create the DHCP pool, including the necessary parameters such as default router and name server. A DHCP

scope example is as follows:

ip dhcp pool <pool name>

network <IP Network> <Netmask>

default-router <Default router>

dns-server <DNS Server>

Where:

<pool name> is the name of the DHCP pool, such as AP9120AX

<IP Network> is the network IP address where the controller resides, such as 10.0.15.1

<Netmask> is the subnet mask, such as 255.255.255.0

<Default router> is the IP address of the default router, such as 10.0.0.1

<DNS Server> is the IP address of the DNS server, such as 10.0.10.2

Step 3 Add the option 43 line using the following syntax:

option 43 hex <hex string>

The hex string is assembled by concatenating the TLV values shown below:

Type + Length + Value

Cisco Catalyst 9120AX Series Access Points

For example, suppose that there are two controllers with management interface IP addresses, 10.126.126.2 and

10.127.127.2. The type is f1(hex). The length is 2 * 4 = 8 = 08 (hex). The IP addresses translate to 0a7e7e02 and

0a7f7f02. Assembling the string then yields f1080a7e7e020a7f7f02. The resulting Cisco IOS command added to the

DHCP scope is option 43 hex f1080a7e7e020a7f7f02.

Cisco Catalyst 9120AX Series Access Points

14 FAQs

What is 802.11ax?

The IEEE 802.11ax standard, also known as the High-Efficiency Wireless (HEW) or Wi-Fi 6, builds off of the 802.11ac

and delivers a better experience in typical environments, and a more predictable performance for advanced applications

such as 4K or 8K video, high-density high-definition collaboration applications, all-wireless offices and

Internet-of-Things (IoT). 802.11ax is designed to use both 2.4Ghz and the 5GHz bands, unlike prior standards.

Cisco Catalyst 9120AX Series Access Points

15 Related Documentation

All user documentation for the Cisco Catalyst 9120AX series access point is available at the following URL:

http://www.cisco.com/c/en/us/support/wireless/aironet-9120AX-series-access-points/tsd-products-support-series-

home.html

For detailed information and guidelines for configuring and deploying your access point in a wireless network, see the

following documentation:

 Cisco Wireless Controller Configuration Guide, Release 8.9, at the following URL:

http://www.cisco.com/c/en/us/td/docs/wireless/controller/8-9/config-guide/b_cg89.html

 Cisco Catalyst 9120AX Series Access Point Deployment Guide, at the following URL:

https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9100ax-access-points/guide-c07-742311.

html

16 Declarations of Conformity and Regulatory Information

This section provides declarations of conformity and regulatory information for the Cisco Catalyst 9120AX Series Access

Points. You can find additional information at this URL:

www.cisco.com/go/aironet/compliance

Manufacturers Federal Communication Commission Declaration of Conformity

Statement

Manufacturer:

Cisco Systems, Inc.

170 West Tasman Drive

San Jose, CA 95134-1706

USA

This device complies with Part 15 rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. This device must accept any interference received, including interference that may cause undesired operation.

Access Point Models Certification Number

C9120AXI-B LDKVCVER1937

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