HP ProCurve 7000dl Series Basic Management And Configuration Manual page 342

Configuring the Data Link Layer Protocol for E1, T1, and Serial Interfaces
Configuring the Logical Interface
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If you have enabled Open Shortest Path First (OSPF) routing on the ProCurve
Secure Router, you should take special care when setting the MTU. OSPF
routers cannot become adjacent if their MTU sizes do not match.
By default, the MTU for HDLC interfaces is 1500 bytes. To change this setting,
enter the following command from the HDLC interface configuration mode
context:
Syntax: mtu <size>
Replace <size> with a number between 64 and 1520.
Add a Description. You can add a description to the HDLC interface if you
want to document information that will be displayed in the running-config.
From the HDLC interface configuration mode context, enter:
Syntax: description <line>
Replace <line> with a phrase up to 80 characters. For example, you might
enter:
ProCurve(config-hdlc 1)# description WAN link to Saratoga Street office
This description is displayed only when you enter the show running-config
command. From the enable mode context, enter:
ProCurve# show running-config
You must then scroll through the entire running-config to find the interface
hdlc heading. To view only the running-config for the HDLC interface, enter:
ProCurve# show running-config interface hdlc 1
This command displays the running-config settings for only the HDLC inter-
face, as shown below:
interface hdlc 1
description WAN link to Saratoga Street office
ip address 192.168.1.1 255.255.255.0
bind 1 e1 1/1 1 hdlc 1
no shutdown