Network connectivity confusion

By mmentele ·
Hey I'm stumped here. I have a fiber run splitting my manufacturing plant as the run is too long for copper. I have 2 old 3 com superstack switches with fiber module and an avaya ERS3500 with a gbic fiber module in my back switch room. In the front I have 2 more avayaERS3500 switches one gbic connecting them to the back and then 2 HP procurve Switches 2810-48G one with a gbic. My plan is to connect the HP procurve to the 3com and separate my voice and data switches. When i plug in the HP gbic in to the fiber the back network goes down. WHY OH WHY?

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