0

I have a Cisco 3650 that doesn't seem to be able to communicate with one particular workstation for some reason and I am at a loss to figure out why and hope someone can give me a suggestion. I have a flat network like the following:

                             -------- PC (OK)
                             |
Switch 2 ---------- Switch 1 -------- PC (Times out)
                             |
                             -------- PC (OK)

Now switch 1 can ping the PC fine but switch 2 cannot. Switch 2 can ping other PCs that are also connected off of switch 1.

I cannot find any valid reason why switch 1 would ping OK but switch 2 cannot.

I am not sure what information you might need but I will post whatever config is required.

EDIT:

Switch 2 Config:

https://pastebin.com/YNrk1947

Switch 1 Config:

https://pastebin.com/TcFVprQA

Switch 2 connects from port Gi1/1/1 to port Gi1/0/48 switch 1. The PC in question is actually 2 more hops away on two other switches. As things work fine from switch 1 I haven't included them but can if need be

  • You need to edit your question to include the switch configurations, otherwise we can only speculate or guess, which is off-topic here. – Ron Maupin Sep 28 '17 at 16:58
  • Thanks, I have included links to to configs on Pastebin as the post is too long otherwise. – Caynadian Sep 28 '17 at 18:14
  • What VLAN are the PCs on? – Ron Trunk Sep 28 '17 at 18:40
  • Thanks for the assist! Unfortunately you would not have been able to solve the issue as I had hidden the mac addresses stickyed to the ports in my config listing. This was ultimately the issue. – Caynadian Sep 28 '17 at 19:42
0

I figured out the issue. I connected the offending PC directly to the problem switch and still couldn't ping it. At this point I realized it must be an issue with the switch so I connected to it from another PC and noticed that the PC had a static mac address attached to gi1/0/1 in the mac address table instead of having a dynamic mac address. It was then that I realized that the mac address had been set as sticky port security on gi1/0/1. Once I cleared that, everything worked fine again.

  • You should accept your answer so that the question doesn't keep popping up forever, looking for an answer. – Ron Maupin Dec 28 '17 at 4:14
  • @RonMaupin Thanks... Forgot to come back and mark it as you have to wait 3 days to answer your own question. – Caynadian Dec 28 '17 at 14:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.