I have a curious issue, I lose telnet access and cannot even ping the management interface of all the cisco switch in a flat network,
I have a core 2750x with 5 trunks using ISL to 5 x3560x, Traffic seems to pass through these switches fine as I have a wireless controller
connected to the core and AP's hanging of these switches and all AP's never lose connectivity with the controller, The AP sends Hello packets every 30 seconds and there will be notifications if these are not received.
Sometimes I have no issues and can telnet from the core or any other switch to one another,
when I log in the next day or even after a few hours the problem manifests, There are no error or dropped packet on all switches, port utilization and CPU utilization are low, Also I have set up port forwarding on the firewall to give me remote access via telnet to the switches this always works?
whilst this problem occurs I can telnet to any switch from the WAN but cannot telnet locally from the switches CLI
any idea's what may be causing this ?
any help would be appreciated