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Cisco Aironet 1552 Series for Hazardous Locations Installation Guide
Appendix F Configuring DHCP Option 43
Configuring Option 43 for 1100, 1130, 1200, 1240, 1250, 1300, 1520, and 1550 Series Access Points
Configuring Option 43 for 1100, 1130, 1200, 1240, 1250, 1300, 1520,
and 1550 Series Access Points
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:
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 AP1550
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 60 line using the following syntax:
option 60 ascii
“
VCI string
”
For the VCI string, use the value from
. The quotation marks must be included.
Step 4
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
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:
option 43 hex f1080a7e7e020a7f7f02
