If I replace 3750 48 gigabit switch with a 3750 24 fast ethernet switch in the stack will the port configuration apply from the 48 port switch to the 24 port, also if I replace a 3750 48 switch with a identical 3750 48 switch will the port configuration apply exactly. Keep in mind this switches are the members not the master.
If you replace a 48 port switch with the same exact model with 48 port, you should be fine. To go from a 3750 48 Gig to 3750 24 fast, you need to deleted the 48 port from the stack and then add the 24 port.
HTH
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