Thursday, November 14, 2019

Physical Optical Loopback

I am turning up a new AWS DX circuit at one of our offices and have been struggling to create a BGP neighborship between my switch and the DX gateway. After a little troubleshooting I discovered the vlan I was using on the trunk for the DX gateway was being blocked by spanning tree although my switch says it is the root. When I run CDP neighbor I see my switch on the port that should be connected to AWS. My theory is my service provided has left in place a physical loop back on the circuit when they were testing. Has anyone ever seen this or played around with looping a port back into its self and what was the behavior you saw?



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