Cisco Loopback Error Detected
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Loopback Error Detected Putting In Err-disable State
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Pm-4-err_disable Bpduguard Error Detected
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Pm-4-err_disable Channel-misconfig (stp) Error Detected
out the reason behind err-disabled loopback. uniqs1502 Share « VLAN question • A little update on daily fun » techsup1983join:2013-03-23 techsup1983 Member 2015-Jun-20 4:47 am [HELP] Figuring https://supportforums.cisco.com/discussion/10905251/pm-4-errdisable-loopback-error-detected-gi02 out the reason behind err-disabled loopback.Hello all.We have a core switch (WS-C3650-48PD) and there are ports which keep showingPort Name Status Reason Err-disabled VlanGi2/0/19 err-disabled loopbackis it a good idea to do the no keepalives command on the ports or would there be a way to get more information.What would be the best way http://www.dslreports.com/forum/r30125337-HELP-Figuring-out-the-reason-behind-err-disabled-loopback to troubleshoot this?Please ask me for anything i've not mentioned. Thanks. · actions · 2015-Jun-20 4:47 am · Network GuyPremium Memberjoin:2000-08-25New Yorkkudos:3 Network Guy Premium Member 2015-Jun-20 9:49 am Please draw up a quick and dirty MS Paint diagram of your topology, particularly where your 3650 connects to other switches. · actions · 2015-Jun-20 9:49 am · markysharkeyPremium Memberjoin:2012-12-20united kingdkudos:3 markysharkey to techsup1983 Premium Member 2015-Jun-21 11:52 am to techsup1983err-disable loopback could be because storm control is enabled on the port and it keeps seeing BPDU's and/or traffic from a loop.As well as the diagram Network Guy has asked for lets have see the output for the following:show run int gi 2/0/19 sho int gig 2/0/19 sho int trunk shp spanning-tree vlan x (where x is the native VLAN) The only time I see a port with the spanning-tree port-state listed as loopback is where every switch in a topology has had spanning tree disabled except for one. I used to demo
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