We are getting ready to replace several hundred 3550's with new 3750's. I am trying to implement DHCP based autoconfiguration for pushing out the configs but have noticed something a bit funny. The mac address used to broadcast for an address does not match the base ethernet mac address found on the label and in show version output. Is this to be expected? Is there any other way of determining the address that will be used by an individual switch when it broadcasts for an address? I was planning on reserving a specific address for each switch but this will be much more difficult if I have to manualy determine the mac address used. Any ideas?