HP ProCurve 7000dl Series Basic Management And Configuration Manual page 334

Configuring the Data Link Layer Protocol for E1, T1, and Serial Interfaces
Configuring the Logical Interface
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For example, you might enter:
ProCurve(config-fr 1.1)# ip address 192.168.115.1 255.255.255.252 secondary
To remove the secondary IP address, enter:
Syntax: no ip address <A.B.C.D> <subnet mask | /prefix length> secondary
You can include an unlimited number of secondary IP addresses.
Set the MTU. The MTU defines the largest size that a frame can be before it
must be fragmented. The MTU size on the Frame Relay subinterface should
match the MTU used by the remote router and the intervening network
devices. Although you can match the MTU on your Frame Relay interface with
that used by your public carrier's equipment, you cannot ensure that all the
intervening network devices will use the same MTU. To avoid any problems
that may occur if an intervening network device is using a small MTU size, you
may want to enable Frame Relay fragmentation. For more information about
Frame Relay fragmentation, see the Advanced Management and Configura-
tion Guide, Chapter 8: Setting Up Quality of Service.
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 Frame Relay subinterfaces is 1500 bytes. To change
this setting, enter the following command from the Frame Relay subinterface
configuration mode context:
Syntax: mtu <size>
Replace <size> with a number between 64 and 1520.
Adding a Description. You can add a description to a Frame Relay interface
or subinterface if you want to document information about it. For example, if
you have multiple PVCs configured on a Frame Relay interface, you may want
to document the other end point of each PVC. In this case, you would enter
the following command at the Frame Relay subinterface configuration mode
context:
Syntax: description <line>
Replace <line> with a phrase up to 80 characters. For example, you might
enter:
ProCurve(config-fr 1.16)# description WAN link to London office