Be sure to use built in cable testing on switches... tdr!

I ran into an issue where a punchdown only had the orange and green wires terminated. Cable testing helps! After the port was re-terminated, the remote netgear was still in half duplex due to the one side being in auto-negotiate, and the other side forced to 100-Full. Usually, I just swap the port to auto-negotiate and it's fixed, but I'm working on a tool to automate issues using the output of tdr testing. Thought I'd share the output of these three cases. 3560X -> Netgear 108T

Run this command to test cable --->

switch# test cable-diagnostics tdr interface gigabitEthernet 1/0/13 

Run this command to see status if a working port --->

switch# show cable-diagnostics tdr interface gigabitEthernet 1/0/13 Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/13 1000M Pair A 69 +/- 10 meters Pair A Normal Pair B 69 +/- 10 meters Pair B Normal Pair C 69 +/- 10 meters Pair C Normal Pair D 69 +/- 10 meters Pair D Normal 

With duplex mismatch --->

Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/13 100M Pair A N/A N/A Not Completed Pair B 0 +/- 1 meters Pair A Normal Pair C 0 +/- 1 meters N/A Normal Pair D 0 +/- 1 meters N/A Normal 

With data only crimp --->

Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/13 100M Pair A N/A N/A Not Completed Pair B 0 +/- 1 meters Pair A Normal Pair C 75 +/- 1 meters N/A Open Pair D 72 +/- 1 meters N/A Open