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"Auto" under Cisco is great when you are working with Cisco products/services so go for it based on their documentation.In this case, I believe that configuring it across the board on the expected traffic path will serve you well. Obviously...test it...
There really is no "easy" answer except "best practice" based on what your company's needs might be. Having said that, I would encourage VLANs by department/device/function since it is much easier to address when/of the department grows or moves.I do...
ip address xxx.xxx.xxx.xxx 255.255.255.252 no ip redirects no ip unreachables no ip proxy-arp ip flow monitor NetFlow-monitor input ip flow monitor NetFlow-monitor output ip access-group 110 in negotiation auto no ipv6 redirects no ipv6 unreachablese...
Check that the stackwise cables are secure on the backside. I would open up a TAC case and send them the sh tech to see if they can see anything. You can also use the online sh tech parser and see what it spits out.Another great tool is the Cisco CLI...