Hi group, I find following statement on Cisco web site (univercd): Use the silent mode when you are connecting to a "silent partner" (a device that is not generating BPDUs or other traffic). An example of a silent partner is a traffic generator that is not transmitting packets. Use this keyword with the auto or desirable mode. If you do not specify silent or non-silent, silent is assumed. I have a Cisco 5000 and a Cisco 6500. Both have tons of FEC ports with default setting (silent) while they are connected to switches (apparently, non-silent partner). There wasn't any problem for years. Could any one tell me how non-silent mode could benefit me? How my current setting could potentially compromise my network? Thanks _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]