I was told by the vendors to stack the switches, but stacking switches will not provide me the redundancy I want and please correct me if I am wrong.Unless Dell is doing something totally different than other vendors with stacking capability, you will still have redundancy with the switches stacked.
I have also been quoted for a MultiMode 6 strand fiber line to be used in the connection between these locations. Which I think it will be good for redundancy (2 strands per switch = 4 strands) and will give me 2 extra strands for backup.One of the drawbacks to using a single "cable" with multiple lines is in the event that the cable gets cut, you lose all your connectivity. If you want real protection, you would have multiple cables taking different paths. Granted, it's redundancy against a significant type of failure, but you asked. ;-)
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--> " ... quoted for a MultiMode 6 strand fiber line ...."
I have to agree with donjohnston
A single fiber cable with 6 strands means that one cut cable and everything is down. Two runs over diverse paths would give you better redundancy. It's also more expensive, but if you need the redundancy it should be worth the cost.