Spanning tree outage with root port removal

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http://serverfault.com – Today, A tech at a remote server site unplugged a single port from one of our fiber converters for our WAN uplink from a Dell PowerConnect Switch. We lost all networking on the 3 stacked 48 port switches for a while, and looking at the log, it appears that removing that one port (which is on a seperate VLAN that only 3 of our ports use) Caused Spanning tree to go crazy.. Apparently, when we plugged the Fiber into the switch 2 days ago, the switch decided to make it the "root port" of the spanning tree config. Once the root port was unhooked, all ports look like they went into a blocking stat (HowTos)