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Justin Cooksey
Justin Cooksey

Posted on • Originally published at justincooksey.com on

Windows Server DHCP conversion to Cisco CLI

I recently ran in to an issue where I needed to convert a reasonably large DHCP database from a Windows Server in to a Cisco CLI to allow the Cisco to take over DHCP roles for a subnet. I found nothing that realy automated this task, even using the exported XML file. So knowing that this was the second time I needed the tool, and likely to need it again, even if it was for smaller tasks, I set about coding it in Powershell. It is the scripting system well supported in Windows land.

The current version of the script can be found on my GitHub repository:Convert-WindowsDHCPToCisco

Still ha smany DHCP options that it hasn't been setup to hanle at this point but it does follow the basic ones that most of us use.

Currently handles DHCP Options

Code Option Description Cisco Output
3 Default Gateway default-router
4 Time Server ignoring
6 Domain Nameserver dns-server
15 Domain Name domain-name
42 NTP Servers option 42 ip
51 Lease time ignoring
66 TFTP Server next-server
67 Boot filename bootfile
81 MS DHCP Name Protection ignoring
121 Static routes option 121 hex
161 FTP Server option 161 ip
162 Path option 162 ascii
252 Proxy PAC URL option 252 asicc

DHCP References Used

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