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This appendix describes the steps needed to configure DHCP Option 43 on a DHCP server, such as a Cisco Catalyst 3750 series switch, for use with Cisco Aironet Access Points. This appendix contains these sections:
This section contains a DHCP Option 43 configuration example on a DHCP server for use with Cisco Aironet Access Points. For other DHCP server implementations, consult DHCP server product documentation for configuring DHCP Option 43. In Option 43, 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.
Cisco Aironet 1000, 1500, and 1552 access points use a comma-separated string format for DHCP Option 43. Other Cisco Aironet access points use 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 60). The VCI strings for Cisco access points that can operate in lightweight mode are listed in Table F-1 .
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Cisco AP c15001 |
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Cisco AP.OAP15002, Cisco AP.LAP15102, or |
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Airespace.AP12003 |
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The following is the format of the TLV block for 1100, 1130, 1200, 1240, 1250, 1300, 1520, and 1552 access points:
To configure DHCP Option 43 for Cisco 1000, 1500, and 1550 series access points in the embedded Cisco IOS DHCP server, follow these steps:
Step 1 Enter configuration mode at the Cisco IOS command line interface (CLI).
Step 2 Create the DHCP pool, including the necessary parameters such as default router and name server. These commands are used to create a DHCP pool:
Step 3 Add the Option 60 line for access point using the following syntax:
For the VCI string, use the value from Table F-1 . The quotation marks must be included.
Step 4 Add the Option 43 line using the following syntax:
For example, if you are configuring Option 43 for Cisco 1000, 1500, or 1500 series access points using the controller IP addresses 10.126.126.2 and 10.127.127.2, add the following line to the DHCP pool in the Cisco IOS CLI:
The quotation marks must be included.
To configure DHCP Option 43 for Cisco Aironet 1100, 1130, 1200, 1240, 1250, 1300, 1520, and 1550 series access points 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. The commands used to create a DHCP pool are as follows:
Step 3 Add the Option 60 line using the following syntax:
For the VCI string, use the value from Table F-1 . The quotation marks must be included.
Step 4 Add the Option 43 line using the following syntax:
The hex string is assembled by concatenating the TLV values shown below:
Type is always f1(hex). Length is the number of controller management IP addresses times 4 in hex. Value is the IP address of the controller listed sequentially in hex.
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 listed below: