Thanks bharani, I thought this, but neither Switch1 or Switch2 is 
the root bridge:

Switch1:#sh spanning-tree  

Spanning tree 1 is executing the IEEE compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address 0005.5e0c.57b6
  Configured hello time 2, max age 20, forward delay 15
  Current root has priority 32768, address 0002.fd3c.18c1
  Root port is 40, cost of root path is 23
  Topology change flag not set, detected flag not set, changes 113816
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15 
  Timers: hello 0, topology change 0, notification 0

Switch2: 
Switch2#sh spanning-tree 

Spanning tree 1 is executing the IEEE compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address 0005.5e0c.c5b5
  Configured hello time 2, max age 20, forward delay 15
  Current root has priority 32768, address 0002.fd3c.18b5
  Root port is 35, cost of root path is 42
  Topology change flag not set, detected flag not set, changes 113815
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15 
  Timers: hello 0, topology change 0, notification 0

what do you think?? One of them could be the designated bridge, but
it doesn't explain why one port is in forwarding and the port in front of it
is in blockin. I think that our friend Fred is right. If
you can break the ring in one point, why break it in two points??
Thanks.




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