• Networking

    Cisco tdr command

    I recently discovered a really cool command for Cisco 3560 switches. It has a TDR (Time-domain reflectometer). It basically means you can test how long the cable is, if it has a short, pair of wires open and any other problem. More info available here from cisco. Switch# test cable-diagnostics tdr interface g0/1 TDR test started on interface Gi0/1 A TDR test can take a few seconds to run on an interface Use ‘show cable-diagnostics tdr’ to read the TDR results. Switch# sh cable-diagnostics tdr int g0/1 TDR test last run on: March 01 00:09:06 Interface Speed Local pair Pair length Remote pair Pair status ——— —– ———- —————— ———–…