HP-UX 11i Version 1 Installation and Update Guide, June 2004

Configuring Built-In PCI Networking
1000Base-T (Gigabit Ethernet)
Appendix D 207
Alternative way to temporarily configure jumbo frame size: Execute:
lanadmin -M mtu_size PPA_number.
The PPA number is the one we obtained from the output of lanscan.
For jumbo frames set the mtu_size to 9000 (bytes). Note: using lanadmin
will not preserve your settings across reboots.