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i configure a 802.1Q trunk between 3750 and a summit7i extreme. The show controller ethernet-controller command show that the counter of undersize frame progress regularly. EDP on extreme is off for the ports, also for spanning-tree
thanks for your reponse,i notify that the version is 12.1(19)EA1D and the problem is only with extreme networks switchs.I have no problem with two 3750
