Resolved! problem when configurign routing on 3550
My Cat 3550 is EMI switch, but I cannot enable ospf on my switch:SW2#sh verCisco Internetwork Operating System Software IOS (tm) C3550 Software (C3550-I9Q3L2-M), Version 12.1(20)EA1a, RELEASE SOFTWARE (fc1)Copyright (c) 1986-2004 by cisco Systems, In...