I've been migrating our management VLAN off of VLAN 1 and have run into some problems with STP. When migrating both switch interfaces (near switch, far switch), I have to time the pastes perfectly for the native vlan command or I run into an issue where I lose permanent connection to the switch on the far side of the connection. I ONLY lose connection to VLAN 1 and the new management VLAN. The other VLANs continue to work fine. The only solution I have found that works is to reboot the near switch which resets "something" and the blocked vlans go back into a forwarding state. My question is, how can I clear the blocked vlans without having to reboot switches? I've tried clearing the mac table, shutting down cdp, resetting cdp, shutting down the interface and turning it back on, nothing seems to work. I have been reading STP troubleshooing for days and the ONLY solution I could find didn't pertain to the switches I am working on, 3500s. These switches do NOT have multiple uplink connections by the way. Any advice would be greatly appreciated.