interface range GigabitEthernet0/17 - 20
spanning-tree portfast trunk
spanning-tree bpdufilter enable
spanning-tree bpduguard enable
Basically this means that the switch will not do Spanning tree on its external ports. Do not do this if you are unsure that you have loops or not. In my case I was quite sure so I just did it :) . Probably some 3 com spanning tree protocol that does not talk nice with rapid-pvst
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