VLAN randomly dropping on one switch

[sprocket10]

Brief site design

- 3750 Core switch with approx 10x 3750 child switches all connected directly back to core.

- Approx 10 VLANs (staff wifi, guest wifi, handheld scanner, management, servers, clients etc)

- Core switch is connected to Watchguard firewall that VLANs are configured on

Issue

- Occasionally, about once every two weeks, the handheld scanner wifi VLAN on one switch (always the same switch) stops responding.

- The switch requires a reboot for the VLAN to start working.

- All other wifi VLANs continue to work on this switch.

- The handheld scanner wifi VLAN will continue to work on all other switches.

- All other VLANs continue to work on this switch.

- The APs are configured with a primary IP on the management VLAN which continues to work and never drops from the wifi controller.

I cant see why one vlan on one switch keeps freezing.

Due to the location of the switch in a 24/7 warehouse, the switch needs rebooted instantly and there isnt much time for diagnostics.

[marce1000]

          >...the handheld scanner wifi VLAN on one switch (always the same switch) stops responding.

           It's a bit unclear what you mean by that , how do you conclude that a VLAN 'stops working' ?

 M.

[sprocket10]

No traffic will pass on that switch while plugged into this VLAN. Its like the VLAN becomes disabled until the switch is rebooted.

[Leo Laohoo]

What firmware are the switch fleet running on? 

3750-series family of switches, including 3750G/3750E/3750X, have some of the most stable IOS in Cisco library. 

[sprocket10]

The switches are patched to the latest available firmware.

[Georg Pauwen]

Hello,

which switch is the root for that Vlan ?

show spanning-tree vlan x

Did you try to delete and recreate the Vlan ?

[sprocket10]

All the VLANs are created on the Watchguard firewall. Not my ideal solution but this was a site design before my time.

The VLAN hasnt been deleted and recreated, but its only a problem on one switch.

[sprocket10]

Why are replies constantly changing to accepted solution, when I am not even doing it. I have even reset my password, so someone is marking answers as accepted.