My network infrastructure is set up with several 3750-Xs as my switch stack. From there I have several satellite 3650 switches that connect back to the core via two fiber pairs set up as a port channel. To manage my switches I have a separate management VLAN.
Here's my issue: while performing on something unrelated I noticed I could no longer SSH to one of my switches from either my linux machine nor my Win 7 machine (neither of these machines have an IP in the management VLAN). This switch trunks back to the core switch stack (like several others) and also has two switches that trunk into it to get back to the switch stack (they're "farther out" so to speak). I can ssh into those just fine, then ssh "back" into the switch I can no longer SSH into from my desktop machines.
At first I couldn't even SSH into the problem switch from other switches "closer" to the core switch stack including the core switch stack itself, then (through no change I made, and I'm the only one who should be working on these switches) suddenly I could.
Troubleshooting this further:
-I can ping all of the management IPs from my desktops besides the problem switch
-I can ping the problem switch's management IP from all of my switches, even when I couldn't connect into it from some of them
-SSH debug shows nothing helpful
-All switches have the same version of SSH
-Checking the allowed VLANs, the managment VLAN is allowed on the trunk heading to the problem switch from the core stack
-I keep versioning history on all of my switches and this switch's config hasn't been changed for at least 4 weeks, even then, any of the changes made to the problem switch or the core switch within the last year have had nothing to do SSH communications and I know I've SSH'd into the switch recently with no issue.
This one is a head scratcher for me. Any help is appreciated.