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I would suggest LAG'ing the 2 connections b/wn the switch stacks and letting the LAG Link hashing determine which link to send the traffic down. If you try to do this w/o LAG, you open yourself up to having a L2 broadcast/spanning tree issue, thus causing you to run a form of spanning tree and only one of the links will be used for forwarding. This will basically put these 2 links in an active/standby state vs LAG will be active/active(and also increased link capacity). Also, LACP is an optional knob for turning up LAG, but in most standard practices its usually turned on.HTH!!