Ethernet Support Guide for HP-UX 11i v3

Example 5 Displaying current speed and duplex setting
To display the current speed and duplex setting, use the following nwmgr command, where ppa
identifies the device by its PPA number.
nwmgr -g -A speed -c lanppa
Sample output (port 2):
lan2 current values:
Speed = 1000 Mbps Full Duplex
Example 6 Setting the speed and duplex
HP recommends setting the speed and duplex options permanently so that they are saved across
reboots; where possible, enable autonegotiation. To do so, edit the driver's configuration file to
set the HP_driver_SPEED parameter, where driver is the name of the driver. For example, to
set port 2 on the igelan driver to autonegotiation, specify the following in the /etc/
rc.config.d/hpigelanconf configuration file:
HP_IGELAN_SPEED[2]=AUTO_ON
To set all ports on an igelan device to autonegotiate and operate at 100 Mbits/s full-duplex
mode, specify the following:
HP_IGELAN_SPEED=100FD AUTO_ON
To set the speed, duplex, autonegotation immediately and permanently, use the nwmgr command
for each port, specifying the --sa option, as in the following example:
nwmgr --sa -A speed=100fd auto_on -c lanppa
3.6 Displaying and setting the receive and transmit flow control parameters
Most drivers support receive and transmit flow control. Flow control allows NICs to use data flow
negotiation and the sending and receiving of pause frames. When the NIC is overwhelmed by
data (such as when the NIC has too few buffers available to handle full-speed reception), it sends
a pause frame to the transmitting end to delay transmission until more data can be handled. If the
NIC has no available buffers, it will discard frames and update counters. When receive flow control
parameter is enabled, the card receives and manages pause frames sent by the link partner. For
drivers that support transmit flow control, when the transmit flow control parameter is enabled, the
card transmits and manages pause frames transmitted to the link partner. When flow control is
disabled, the card will silently discard these pause frames.
3.6.1 Flow control parameters
All drivers support receive flow control except btlan. Several drivers do not support transmit flow
control. Flow control parameter names, default values, and support varies from driver to driver.
Table 10 (page 28) lists for each driver the configuration file parameter, nwmgr parameter, and
defaults for receive and transmit flow control. Possible values for each parameter are ON or OFF.
NOTE: The btlan driver does not support flow control in either direction.
3.6 Displaying and setting the receive and transmit flow control parameters 27