Setting An Interface's Client Id - HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual

Dynamic Host Configuration Protocol (DHCP)
Configuring a Router Interface as a DHCP Client

Setting an Interface's Client ID

DHCP servers use client identifiers to index their database of address bind-
ings. This database maps clients to their temporary IP addresses and other
configurations. A client sends its identifier in its Discover messages. Each
client on a subnet must use a unique client identifier. Because MAC addresses
are by definition unique, they are most commonly used.
The Secure Router OS automatically populates the client identifier for an
interface with the interface's media type and MAC address. Typically, you
should assume that the server accepts this type of ID and not alter it.
You can, however, have a WAN interface use an Ethernet interface's MAC
address. For example, you might want to identify the router using a single
MAC address. If your organization later purchases a different module to
connect to the provider, you can receive the same IP address. When you
configure the interface to take a dynamic address, enter this command:
Syntax: ip address dhcp client-id ethernet <slot>/<port>
You can alternatively manually enter a hexadecimal string for the client
identifier.
The client identifier does not have to be based on a MAC address, although it
almost always is. In the past, some administrators opted for customized
identifiers so that a user could receive the same address even after changing
network hardware. You can use a unique identifier instead of a MAC address
for this same purpose: you can change how you connect to a service provider
without having to negotiate a new address.
Your service provider should inform you what type of identifier it uses. You
can then agree upon a unique identifier for your interface, if necessary.
You enter a customized ID as a hexadecimal number or a text string (which
the router converts to a hexadecimal value):
Syntax: ip address dhcp client-id [<HH:HH:HH:HH:HH:HH:HH> | <text string>]
If you enter a hexadecimal number, you must enter seven numbers separated
by colon delimiters. For example:
ProCurve(config-atm 1.102)# ip address dhcp client-id 0f:ff:ff:ff:ff:ff:ff
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