I don't know exactly how to describe my problem, but I'm hoping someone may be able to give me some suggestions on what to try.
Our school district has 8 buildings, 2 connected via T-1 circuits, 3 connected by our private gb fiber, and 3 connected via 10mb Embarq MetroEthernet. The three buildings on the Embarq fiber are configured identically and have the same equipment. (Cisco 3524/3550 switches and a 2621 router for SRST.)
Last week, one buildings had trouble connecting to the Internet. Local network traffic to the Novell servers and printers was OK. The strange thing is their Cisco IP phones work perfectly. They have not had a problem with the phones. The voice vlan is 96, the data vlan is 32 and the mgmt vlan is 252. (Each buildings phones, data and mgmt are on different vlans)
At the high school, the vlan interfaces are present on a Cisco 3640 router. I can ping devices on both ends of the fiber. I have deleted and re-created the vlan 32 interface and no change.
I have tried swapping switches at the remote site, and swapping the router at the high school. Nothing resolves the problem. The problem appears to lie at the high school in the switch stack or router, but I don't know how to pin-point the problem.
Tomorrow I am planning to configure a spare switch and connect just the problem building to the router and see what happens.
Are there statistics in the switches and/or router that will help find the problem?
I'm pulling my hair out on this one. All of the network support people I have talked to at my ISP have no ideas.
If you have any suggestion, I'm all ears.
Madison Local Schools