Cisco Catalyst 1000 - Access port flapping

[Diogo Figueiredo]

Hello all,

I am having an issue whith a brand new Catalyt 1000, I have two APs and one PC connected to the switch, all ports are configured as access ports without VLANs now, I even completely reseted the switch without any particular configuration, and I have the PC NIC interface going up and down without reason, all the devices work only this particular PC.

I have changed the cable, changed the port, and checked for any speed/duplex mismatches, but everything is ok. To discard a PC NIC failure when I connect the PC to an AP which is connected to the switch it works. I think it could be a NIC - Switch incompatibility or a missing setting for the NIC on Windows. The drivers are fully up to date as well.

Does someone have an idea?

Thanks in advance,

Diogo Figueiredo

[Leo Laohoo]

Go to the PC and ping, say, 1.1.1.1.  

Is the pinging continuous or does it stop?

[Diogo Figueiredo]

Hi,

Fro the PC it stops, the interfaces of pc and switch go down, I haven't other means to reach the switch, I analyzed with my laptop connected to the switch everything is working only that damm PC goes down.

[balaji.bandi]

Connect the console to the switch, post the logs, and show interface gix/x

try to setup the manual speed to 100 and see if that works.

or get another PC or USB Ethernet and test it.

[MHM Cisco World]

can we see the config of port ?

[Leo Laohoo]

Post the complete output to the command "sh interface PC_PORT".

[Diogo Figueiredo]

Hi,

I will post it later when on the switch, but the only config I did was to set switchport mode access, if I take another pc, or if I connect this PC to an access point connected to the port of the seitch it works, no problems at all.

But as I want to use later VLANs I need this PC connected to the switch.

[balaji.bandi]

if the other PC works as expected when you connect to wifi. 

wireless has a different adaptor and wired nic has a different adaptor.

so if you take another PC connected to the same switch port using Ethernet is this works? if that works ?

so we know the answer right?

[Diogo Figueiredo]

When I mean connect to an AP is an AP which has ethernet ports, it works connected via cable to the ap, ap which is connected to the switch. I think is some settings on the NIC or kind of incompatibility between NIC and Switch but it's frustrating I paid a price for the switch and will probably not be able to use it.

[balaji.bandi]

One thing you need to understand here is...When you connected AP to the switch port - it come up - which shows we do not see any issue with the Switch here.

The only issue you keep posting here PC  and we suspect NIC (which may be faulty ethernet - no one knows except you - to check)

We do not have proof that this NIC working.

Check what Interface card you have in the PC -

Tell us how are you using the Internet. Do you have any other device ? or you only have 1 PC to test ?

[Diogo Figueiredo · Accepted solution]

Hi,

I found my issue, problem solved, I deactivated the Energy Efficient Ethernet setting on my NIC and now it never went down again. I leave a screen shot in the end. Thanks all for the help.

BR

Diogo Figueiredo

[balaji.bandi]

Sure this was expected as per your description, client NIC has something to do, but since we don't have any visibility we hard to guess what is configured there - until you show us more visibility

anyway glad you were able to resolve the issue.