Great Cisco forum post about the IOS TDR feature: http://ift.tt/2rgIAWP
Anyhow, I'm troubleshooting a port, on a WS-C3560X-48P-L running 12.2(55)SE8
This is what I get:
Switch#test cable-diagnostics tdr int g0/37 Link state may be affected during TDR test TDR test started on interface Gi0/37 A TDR test can take a few seconds to run on an interface Use 'show cable-diagnostics tdr' to read the TDR results. Switch#show cable-diagnostics tdr interface g0/37 TDR test last run on: January 17 13:02:40 Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi0/37 100M Pair A N/A N/A N/A Pair B N/A N/A N/A Pair C N/A N/A N/A Pair D N/A N/A N/A Switch#
It looks like the TDR test ran successfully, but everything's N/A?
The int is up/up, and in heavy use. Maybe TDR doesn't work when the int is mostly saturated?
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