HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 284

Configuring the Data Link Layer Protocol for E1, T1, and Serial Interfaces
Configuring the Logical Interface
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For example, if you do not want the DHCP client to use the default route and
name server settings that it receives from the DHCP server, enter:
ProCurve(config-fr 1.1)# ip address dhcp no-default-route no-nameservers
Changing a Setting for the DHCP Client. If you want to change a setting
for the DHCP client, you must first disable the client. Then you can enter the
command to enable the client with the setting that you want to change.
Before you disable the client, you should release the IP address obtained
through DHCP. This will prevent the DHCP server from holding the IP address
and allow it to assign the IP address to another client.
Releasing or Renewing an IP address. If you want to manually force the
Frame Relay subinterface to release or renew an IP address, enter these
commands from the Frame Relay subinterface configuration mode context:
ProCurve(config-fr 1.1)# ip dhcp release
ProCurve(config-fr 1.1)# ip dhcp renew
Remove the DHCP Client Setting. If you decide that you no longer want
the Frame-Relay subinterface to be a DHCP client, enter:
ProCurve(config-fr 1.1)# no ip address dhcp
Configure the Frame Relay Subinterface as an Unnumbered
Interface. To conserve IP addresses on your network, you may want to
create the Frame Relay subinterface as an unnumbered interface. When you
assign a logical interface on the router an IP address, that IP address cannot
overlap with the IP addresses assigned to other logical interfaces. As a result,
each interface that has an IP address represents a subnet. Depending on the
subnetting scheme you use, this could use more IP addresses than you
can spare.
You can configure the Frame Relay subinterface as an unnumbered interface
that uses the IP address assigned to another interface. The Secure Router OS
uses the IP address of the specified interface when sending route updates over
the unnumbered interface.
Before configuring the Frame Relay subinterface as an unnumbered interface,
you should be aware of a potential disadvantage: If the interface to which the
IP address is actually assigned goes down, the Frame Relay subinterface will
be unavailable. For example, suppose you configure Frame Relay 1.16 as an