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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:
Enter configuration mode at the Cisco IOS CLI.
Step 1
Create the DHCP pool, including the necessary parameters such as default router and name server. A DHCP
Step 2
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
Add the option 43 line using the following syntax:
Step 3
option 43 hex <hex string>
The hex string is assembled by concatenating the TLV values shown below:
Type + Length + Value
17
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Questions and answers
I ned to configure Cisco C9120AXE-Z as an access point to my home router, how to configure, what is the home page IP such as 192.168.x.x
To configure the Cisco Catalyst 9120AXE-Z as an access point to a home router:
1. Power the Access Point: Connect the AP to a power source using PoE (Power over Ethernet) or a compatible power injector.
2. Connect to Network: Connect the AP’s Ethernet port to your home router using a network cable.
3. Ensure Layer 3 Connectivity: The AP must have Layer 3 connectivity to the management interface of a Cisco Wireless Controller, if used.
4. Controller-Based Setup: If using a Cisco Embedded Wireless Controller (EWC) model (e.g., C9120AXE-EWC-Z), access the AP via web browser or CLI for setup.
5. Use DHCP or Static IP: By default, the AP tries to get an IP address from a DHCP server. If DHCP is not available, you may need to configure a static IP.
Default IP Address: The 9120AX series does not have a fixed default IP address. It obtains an IP address via DHCP. If DHCP is not available, connect directly and configure manually using the controller setup.
This answer is automatically generated