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CISCO 3850 - Unknown protocol drops

Judin_SungHoon
Level 1
Level 1

‎10-10-2018 09:15 AM - edited ‎03-08-2019 04:21 PM

Hi,

 

I need some advise. I have a core switch Cisco 3850. One of the port that currently connected to my PABX having issue whereby the unknown protocol drop keeps on increasing every 2-3minutes. The rest of the port seems fine. What is the root cause of this issue? How to fix it? Can this issue give a problem to my IP phone quality like cracking sound during talking?

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16 Replies 16

Judin_SungHoon
Level 1
Level 1
In response to Leo Laohoo

‎10-11-2018 08:48 AM

yes, it never under trunk mode. All this while it is under access mode.

Yes it is increasing every 1minute or 2minute.

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Leo Laohoo
Hall of Fame
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In response to Judin_SungHoon

‎10-11-2018 02:45 PM

So exactly what is this downstream device? Is this issue the same with other ports? Or is it just this port?
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