I have implemented Spanning tree on switches 2950 on two 3550.
Everything works fine, spanning tree is fonctionnal (I made tests disconnecting interface and giga ports are going from Bloked to forward state), but after 1 or 2 hours, one of the 2 giga interfaces on 2950 detect link-flap error...
I have two 3550 12G as core layer linked together with a 3 agregate ports channel, and several 2950 (as distrib layer)witch have each 2 giga redondant link on each 3550. I have configured (?) spanning tree, when I disconnect one link sometimes it works and the 2nd redundant link comes up...
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