Indeed @Bonznumber1 anything over 3m can get expensive for those... As you'll be connecting via the front ports then if possible just connect them round in a loop and spanning tree will close one connection but give you a redundant link. If you need more than 10GB/s then you can pair connections up using aggregation. With regard to the MX connections, spanning tree should do the same, but I'd remove one cable so it is only connected to two of the three switches. What switch firmware are you running? I'd make sure it is 14.32 to ensure you avoid MS to MX spanning tree issues...
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