HP-UX 11i Version 1 Installation and Update Guide, June 2003

Configuring Built-In PCI Networking
1000Base-T (Gigabit Ethernet)
Appendix D198
lanscan
Step 3. Set the MTU value to 9000 for jumbo frames by executing:
lanadmin -M 9000 PPA_number
Step 4. To verify MTU change, execute:
netstat -rn.
Step 5. To check the current Ethernet frame size, execute:
lanadmin -m PPA_number
NOTE An alternative way to configure the jumbo frame size is to edit the file
/etc/rc.config.d/hpgelanconf (or
/etc/rc.config.d/hpigelanconf). Set the parameter
HP_GELAN/IGELAN_MTU[0]=9000 and insert the proper
HP_GELAN/IGELAN_INTERFACE_NAME. When the system reboots,
the interface will be configured for jumbo frame operation.