Cisco Catalyst 9120AX Series User Manual

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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 Specifications

General

Frequency Bands	2.4 GHz and 5 GHz
Antenna Type	Internal Antennas
PoE	802.3at PoE+
Wi-Fi Standard	802.11ax
MIMO	4x4 MU-MIMO
Weight	1.2 kg
Form Factor	Ceiling mount
Ethernet Ports	1 x 10/100/1000/2500 Multigigabit Ethernet port (RJ-45)
Dimensions	8.7 x 8.7 x 2.2 in