How to bind an IP to a specific switch port with DHCP

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http://serverfault.com – I have servers connected to multiple Juniper EX4200 based virtual chassis. In order to make them hot swappable without manual reconfiguration, I would like to be able to always give the same IP, with DHCP, to servers connected to a specific switch port. Or, alternatively, to be able for the server to know which port it has been connected to. Is any of these setups possible? Thanks. (HowTos)