I was unsure if it was possible to create a 3750 stack using a mixture of standard and enhanced licenses. I was pretty sure they would join the stack but was unsure what features would work afterwards. Would the entire stack gain routing functionality or would it be limited to just the EMI images? Would the entire stack be forced to run as an SMI image? These were the questions I needed answers to. After much digging I came across a Cisco TAC article which answered all my questions. * The IOS software version on all stack members, including the stack master, should be the same. This helps ensure full compatibility in the stack protocol version among the stack members. For example, all stack members should have either the EMI or SMI * If your switch stack must have switches running SMI and EMI software,the switch running the EMI software should be the stack master. EMI features become unavailable to all stack members if the stack master is running the SMI software. * At least