Ever since upgrading a wireless mesh at one of my sites I've been having very peculiar network issues. On the end of the wireless mesh I have a switch that intermittently stops responding. Every 60 seconds on the dot, the management IP address becomes unreachable for exactly 48 seconds on a continuous cycle. I know that the wireless mesh is staying up, because when I run a constant ping to a PC on the other side of the switch I never lose connectivity. Even more interesting is the fact that if I run a constant ping from the switch having issues over the wireless mesh, it never goes down, almost as if the ICMP traffic is keeping it alive somehow. I have a TAC case open right now, but wanted to throw it out to you swell folks to see if anyone has seen anything similar before.
(Unsuccessful) Troubleshooting steps taken:
- Verified proper VLAN tagging between switches and APs
- Rebooted switch
- Upgraded to latest stable release of firmware
- Disabled STP
- Put layer 3 address on the same VLAN that the PC is on (the one that never drops packets) to see if the same thing happens.
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