CP MAC allows duplication
You can add a duplicated mac address if a char is lower in one entry and upper in the other one.
aa:00:00:00:00:00 and AA:00:00:00:00:00 can be added simultaneously.
Convert mac address to lowercase when saving to avoid duplicates. It fixes #3195
#1 Updated by Jim Pingle over 7 years ago
We should probably have a standard MAC cleanup/validation function that would also accept other MAC formats as input and normalize them to our preferred format and case.
For example, it would take 0000.0000.0000 and make it 00:00:00:00:00:00, or AA-00-AA-00-AA-00 and make it aa:00:aa:00:aa:00, or AABBCC-000000 to aa:bb:cc:00:00:00
It would solve this problem and others.