Optional Step: Configure Jumbo Frames Size (Jumbo frames are supported only at 1000 Mbit/s)

Jumbo frames for the iether driver on HP-UX 11i v 1.0 and on11i v 2.0 of September 2004 (or later) have an mtu_size in the range from 1501 to 9000 bytes.

If you are using Jumbo Ethernet frames, ensure that:
- all end stations on a given LAN^[3] have the same maximum transmission unit (MTU) setting;
- intermediate stations such as switch ports in your LAN have an MTU equal to or greater than the end station’s MTU.
Obtain the PPA number of the card by entering lanscan.
Choose one of the following two configuration methods to permanently save your configuration.
- use the GUI-based system admin manager (SAM).
  To use SAM, type sam at the HP-UX system prompt; then double-click Networking and Communications, Network Interface Cards. Click on the interface; select “Modify...” or “Configure” from the Action menu, and then select “Advanced Options” to change the MTU size. See Ethernet Support Guide for details, and then do the steps for verifying the MTU size;
  or
- edit the following configuration file using an editor such as “vi”:
  /etc/rc.config.d/hpietherconf.
  Set the mtusize by editing HP_IETHER_MTU[i]=mtusize,
  and insert the proper interface name: HP_IETHER_MTU[i]=HP_IETHER_INTERFACE_NAME.
Remember that Jumbo Frames needs to be configured for each port. When the system reboots, the interface will be configured for jumbo frame operation.
Verify MTU change by entering netstat -rn. If MTU has not changed, enter the following commands:

$ifconfig lanPPA_number unplumb
$ifconfig lanPPA_number ip_address netmask netmask up
To check (or verify) the current Ethernet frame size, enter:

$lanadmin -m PPA_number

An alternative way to temporarily configure jumbo frame size is to enter:
lanadmin -M mtu_size PPA_number.

Using lanadmin will not preserve your settings across reboots.

The PPA_number is the one we obtained from the output of lanscan. For using Jumbo Frames with the iether Gigabit Ethernet driver on HP-UX 11i v 1.0 or 11i v 2.0 of September 2004 (or later), set the mtu_size to a number from 1501 to 9000 (bytes).

For Further Information

For further information on this card, please refer to http://docs.hp.com and then look under Networking and Communications. This card’s information is primarily located under the subsection called “Gigabit Ethernet.”

Maintenance and troubleshooting information about the iether Gigabit Ethernet driver used in this product is located in the Ethernet Support Guide.

Information on which Ethernet driver is used with each network card can be found in the Ethernet Support Matrix . That matrix also tells which versions of HP-UX work with each network product as well as how many cards are supported per system.

The AB545A is a 4-port GigE version of HP’s A7012A 2-port card. They both have similar features and use the same iether Gigabit Ethernet driver.

^[3]In the Jumbo Frames discussion, “LAN” means that the end stations do not have any routers or layer 3 switches in between them.

Optional Step: Configure Jumbo Frames Size (Jumbo frames are supported only at 1000 Mbit/s)

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For Further Information