moodymutey - Thanks for posting your question on the forum. I would say we first need to figure out what state the PC is in when it loses network connectivity and also see if the switch correctly knows where the PC is in the network. Here are some things that would be helpful to know:
- Does the PC have an IP address and Default Gateway assigned when it is in this state? The output to "ipconfig" within the PC's command prompt window will answer this question.
- If the PC does have the correct IP and Default Gateway, is the PC able to ping its default gateway? Is it able to ping any device within its network? Is it able to ping out to the internet (i.e. 18.104.22.168)?
- Is the 1234 currently running a single VLAN? If so, try pinging the PC from the 1234 and the view the "show arp" and "show mac address-table". Within the "show arp" table, you will want to see if the IP address of the PC is matching up with the correct MAC address of the PC. If the 1234 is unable to resolve the MAC address, this is important to note as well. Within the "show mac address-table" output, you will want to make sure that the MAC address of the PC is listed only once and that it is linked to the correct switchport.
- It would also be good to try the above test with the 1534 as well.
The answers to these questions will help in narrowing down where the issue may lie. It may also be good to view the switchport statistics along the path the PC takes in the network to its destination.
Let us know if you have any further questions.
Thanks for the suggestions, Noor. As I said in my post, I can only be in
waiting mode until the next time this intermittent problem strikes. When it
does, I will follow your suggestions and then post again.
Ben Pressman Head of Maintenance & IT, Safety Officer
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So, approximately a year later, I realized this post is still open. What happened is that the intermittent problem went away. I never got the chance to implement Noor's suggestions. Therefore I am closing the case without knowing what was really going on.