clifford.network / toolbox

Tools for engineers who change Cisco networks.

Free, fast and in your browser. Nothing you paste is uploaded. Built by James Clifford after thirty years of change windows.

free tool

Change Checker

Paste show output from before and after a change. See what broke, what moved and what's just expected, worst first, ready for the ticket.

Open the Change Checker free tool

BGP AS-Path Regex Tester

Test an AS-path expression against real paths, with the underscore handled the way Cisco handles it, and copy the config for IOS XE, NX-OS or IOS XR.

Open the regex tester
Wildcard mask calculatorComing next to the toolbox.
A history of networkingFrom ARPANET to SD-WAN, on one timeline. Coming soon.

The Change Window Starter Pack

The checks, the rollback rules and the paperwork I use on every Cisco change. It's an 8-page PDF and a Word MOP template, and it's free.

  • Before-and-after capture commands for IOS XE, NX-OS and IOS XR
  • The 2am rollback decision sheet
  • A one-page MOP template for the change board
  • A complete IOS XE upgrade playbook
Get the free pack
change window kit

MOPs, checks and rollbacks in 10 minutes

The MOP Builder writes the method of procedure, the change board wording and the rollback for ten common Cisco changes across IOS XE, NX-OS and IOS XR.

See the Kit