Ethernet Support Guide (for HP-UX 11i v1, 11i v2)

Introduction to Technology
Gigabit Ethernet Overview
Chapter 1
17
• Jumbo Frames support:
— Large 9000-byte maximum transmission unit (MTU) for improved efficiency and
performance with bulk data transfer. On HP-UX 11i v2, the jumbo frames range
is 1501 - 9000. See Table 3-1 for allowable MTU settings per driver and HP-UX
release
— Supported only at 1000 Mbit/s interface (link partner must also support Jumbo
Frames)
• SNMP (MIB-II) support
• MC/ServiceGuard and Auto-Port Aggregation (APA) support for high availability
• Configuration support through SAM
• Promiscuous mode (link and SAP) inbound and outbound support
• Supports TCP/IP, NFS and DLPI applications (Ethernet and SNAP encapsulations
are supported)
• Supports OL* (Online Addition and Replacement) (HP-UX 11i v1 PCI-X and 11i v2
PCI/PCI-X only)
Note that the SX and T cards are not considered to be like cards for OL* that is, you
cannot replace an SX card with a T card, and vice versa.
HP does not support OL* on A6794A.
Checksum Offload Changes for the iether and igelan Gigabit
Ethernet Drivers
Beginning with the HP-UX 11i v1 and v2 OE release of May 2005, the iether and igelan
gigabit Ethernet networking drivers allow you to turn the CKO feature of the gigabit
Ethernet interface ON or OFF for both the receive and send sides of the card. With this
and subsequent versions of the iether and igelan drivers:
• The default for receive side CKO is OFF (disabled). Prior to the May 2005 release,
the receive side CKO was ON (enabled). This setting can be restored as explained in
the examples that follow.
• The default for the send side is CKO ON (enabled) -- the same setting as on prior
releases.
Example settings for iether driver:
The following description is for the iether driver; if you’re using the igelan driver, just
substitute igelan for iether in the following strings.
Recommended: To set the CKO options permanently (so they’re saved across reboots),
edit the following values in the /etc/rc.config.d/hpietherconf file:
HP_IETHER_SEND_CKO and
HP_IETHER_RECV_CKO and set them to ON or OFF
To determine the current CKO settings, enter the following command:
lanadmin -x cko ppa