Hey all,
I have a Cisco 2960S-PST-L 48 port switch that will either not forward traffic for one of our VLANs completely or it will forward a very small amount of traffic and then stop. When I connect a laptop directly to the switch, it takes a while to pull DHCP information and my network connection icon (Windows 7) will either show as if it has a connection to the Internet or it'll show as if it has limited connectivity. When I run ipconfig /all, I obtain all the necessary information needed to communicate locally and to the internet. I can't ping by host name to a local machine or out to the Internet from my laptop. From the switch I can ping out to the Internet via hostname, however. If I put the switch port in a different vlan such as VLAN 1, I can get IP info and browse the LAN & Internet with no problems. To ensure that it's not an issue with the DHCP server, Web filter, or Firewall, I've had a laptop tested at another switch of the same model and all works fine regardless of the VLAN; even the VLAN in question on this switch. In troubleshooting, I've checked CPU history, STP, and interface errors. No high CPU utilization, no loops, and no input/output errors, etc. I have also deleted my vlan.dat file to wiipe out VTP, rebooted the switch, and let it re-learn VTP info. It sounds software related and I haven't upgraded the IOS yet. The current version of IOS is version 12.2(55)SE5. The only change I made to this switch is adding all 48 ports to VLAN 60 on our network and removing the auto qos command from the interfaces as well as any lines added from using the auto qos command. No other changes were made. What could be the problem? I can post a copy of the config if needed.
Regards,
Terence
