You gotta have spanning-tree folks when you do redundant fiber links. Either that, or do what I prefer which is static trunks (which is the same as Cisco etherchannel). Networks dont like loops, and can you blame them? They cause havoc!!!
I sat at home tonight while another engineer who lived close to this customer went onsite. 99% utilization on the core and as it turns out, if you plug that second fiber in, the network goes nuts.
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