We have a site located across the street where we provide service. They are connected with 100 meg MM fiber link. We recently moved these folks onto our wire from a 3com network that their IT guys used to run, and when I brought them over I put them on the same VLAN as some of their users who reside on the same side of the street as us. So basically here is how they are connected:
near side users -> (6509 vlan 87) -> SM fiber (Cisco 3508) -> MM Fiber 100 Meg link -> (Remote Site Cisco 2924 vlan 87)
These people have been experiencing broadcast storms almost everyday, each time happening mid morning and generally around mid afternoon. I have traced down several PC's and shut them down to alleviate the problem, but their IT folks say they can't find anything wrong with the PC's even though once these are shut down the problem clears up. It's been different PC's each time. I implemented port-storm control with a level of 5%, but that seems like it might be to high, and I may need to lower it, but it has helped to recover from the problem faster. Unfortunately I have a few switches over there that don't support the command.
The funny thing is the broadcasts only effect people in that building, and they latency isn't experienced across the street, not even the 3508 is affected neither are the users on the same vlan across the street.
I am probably going to implement VLANS within the building as I do have a trunk into the building and vtp setup, but since it is a building wide problem I am not sure how much that's going to help. Anyone have any suggestions, or ideas? Thanks.