i have a real lab which was run before over utp ( core switch2960) but for some requirement i install new core switch 3850 and put fiber sfps now from my server i am copying daily in terabytes after few hours the backup is going fails while reverting to 2960 core switch is working fine any idea please ?
please view my lab in picture the lab1 is working while lab2 is going fails after few hours
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I assume the new core is using the same SDM templetes, switching method, stp etc...
Are you using different cabling : copper and now fibre or fibre now copper?
What do the interface statistics report, any drops, errors etc...
Can you post the config of the 2960 and 3850 core?
i see show cdp nei it show the output mismatch while the connectivity is point to point there is no multipale path and also no hum nothing straight connection from core to switch