The layout for this problem is:
At location #1 there are 4 switches A, B, C and D connected to each other in a small mesh.
At location #2 there also are 4 switches E, F, G and H connected to each other in a small mesh.
There are several vlans trunked between the switches, and 2 fiber connections between the two locations.
The problem that occurred the other week is a broadcast storm. The storm disappears when I disable one of the two fiber connections between the two locations.
I found that the root selection works fine for vlan 2-999 but not for vlan 1. One switch at location #1, lets say A, is root for all vlans. But another switch at location #2, lets say E, is root for vlan 1 and only vlan 1.
I can swap the root for vlan 1 between switches E, F, G and H by changing the priorities on ditto. But I am unable to make A the root for all vlans.
Seems like BPDUs are dropped for vlan 1 over the fiber connection. But then again why do they come through for vlan 2-999?
The switches are 2 x WS-C3560G-24TS and 2 x WS-C2950T-24 at location #1 and 4 x WS-C3560G-24TS at location #2.
What could be causing this problem?
Thanks in advance!