Hi, we have a network consisting of a C6509 with SUP2 supervisors and about 20 3750's (in stacked configurations) throughout our organisation. We have also have 8 VLANs (VoIP, VMWare, DMZ, etc).
Since a couple of days we have a loss of network connectivity throughout our organization, that lasts several minutes. So far it only happens at night. No errors that could give an explaination about this is logged in any switch, except for a large amount of ports going down and up again.
What are things to look for if you have network connectivity issues at specific times on your network? What type of logging can I enable on our switches that might show a cause?
Right now I suspect a spanning-tree event to happen, but as far as I know this type of event is logged by IOS, so there should be logging relating to that, but there isn't.
Anyone who can guide me in the right direction? Many thanks!