What is the best practice for UDLD? My network has the standard setup with Core, distribution and access layer switches connected with Gig-E copper cable. The connections between all the switches are trunk-ed. When I issue ?show diagnostic sanity? it recommend I enable UDLD in all the trunk ports. Is it advisable to enable UDLD for all the trunk ports, since the physical connection is copper? Do I gain anything; I always thought UDLD is more helpful using fiber. Thank you in advance for your help.