Hi Guys, Today I was on site troubleshooting a down link on a cisco 7513 router. After isolating the router from the core network by doing a loopback to the fiber connection port e4/0 (the "problematic port"), a test ping indicated normal subsequently. After that I connected the port back to the core, wondering thru my lunch break what could be the reason?? :o Have anyone experienced this before or knows anything of such "sightings"? Kindly share your views with me? Thanks and regards Alex Boh _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]