08-18-2021 06:48 AM
Hi,
we have some C3650-48FQM which shows strange output on "show cable-diagnostics tdr int gi x/y/z"
All connections are 4 wire (2 pair) connections.
switch#sho cable-diagnostics tdr int gi1/0/38 TDR test last run on: August 18 10:39:48 Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/37 auto Pair A 0 +/- 10 meters N/A Normal Pair B 0 +/- 10 meters N/A Normal Pair C N/A N/A Normal Pair D 0 +/- 10 meters N/A Normal switch#sho cable-diagnostics tdr int gi1/0/38 TDR test last run on: August 18 10:39:48 Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/38 100M Pair A 50 +/- 10 meters N/A Normal Pair B 183 +/- 10 meters N/A Normal Pair C 4 +/- 5 meters N/A Open Pair D 4 +/- 5 meters N/A Open switch#sho cable-diagnostics tdr int gi1/0/39 TDR test last run on: August 18 10:52:48 Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/39 100M Pair A 44 +/- 10 meters N/A Normal Pair B 44 +/- 10 meters N/A Normal Pair C 7 +/- 10 meters N/A Normal Pair D 5 +/- 10 meters N/A Normal
Any suggestions? Is this a bug?
greetings
Jörg
08-18-2021 07:07 AM
int gi1/0/38
i would investigate this Physical patches cables, shows more distance ? is this correct ?
Good documentation to understand :
08-18-2021 03:52 PM
What firmware is the switch running on?
08-18-2021 11:36 PM
The switches are running 16.9.4
08-19-2021 12:37 AM
That is one dodgy output. Personally, I would not trust an output like that.
What is the uptime of the switch?
08-19-2021 06:58 AM
Hi,
thanks for all your answers and questions.
The switch was booted when checking this but the output was the same strange thing as before the reboot.
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