Monday, June 28, 2021

What could cause a Cisco switch of not learning the mac address of a PC/IP Phone?

I’ve been facing some problems at work lately and I would like some help. Sometimes a few users complain about not having internet access so when I checked the switchport that the pc is connected to, the interface was up and status was connected but when I did “sh mac address int x/x”, it was empty. Happened with a few other as well. The other problem I’m facing is, some users t even though everything looks fine and their pc has an ip address assigned etc can’t access the internet even though other users in the same subnet can access the internet normally. Our access switches are C3850. Any idea what could cause these 2 issues?



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