lan_config - Modifies low-level configuration parameters for a given LAN
/usr/sbin/lan_config -i interface_name [-a [0 | 1]] [-m [aui | bnc | utp |
fiber]] [-s [10 | 100 | 1000]] [-x [0 | 1]]
Changes the specified characteristics for interface_name. You must pro-
vide an interface name.
Enables (1) or disables (0) IEEE 802.3u autonegotiation. This option
applies only to those devices that are capable of autonegotiation (for
example, DE500-AA and DE500-BA). When enabled, the interface automati-
cally negotiates the link speed (10, 100, or 1000 Mb/s) and the mode
(half-duplex or full-duplex) with the remote interface.
The interface initiates the autonegotiation process only if and when
it is up and running. See ifconfig(8) for information on how the
interface is marked up.
For DE5xx devices, the interface initially advertises the speed and
mode previously selected at the console level or with the -s and -x
options. The -s and -x options may also be specified on the same com-
mand line as the -a option to redefine and renegotiate the interface's
capability (when enabled) or to force the interface at a certain confi-
guration (when disabled).
Changes the type of medium. The following table lists the supported
aui 10Base5, or thick wire
bnc 10Base2, or ThinWire
10BaseT (if speed is 10 Mb/s) or 100BaseT (if speed
is 100 Mb/s), or twisted-pair
fiber 100BaseFX only
On some devices, for example, DE435 and DE425, bnc selection is done by
means of an on-board gang jumper. When specifying aui or bnc for these
devices, be sure that the jumper is in the correct position.
Changes the medium speed, if the interface is capable of operating at
both regular (10 Mb/s), fast (100 Mb/s), and gigabit (1000 Mb/s)
Ethernet speeds. The default is 10 Mb/s. The fast and gigabit speeds
cannot be selected for the aui and bnc media.
Enables (1) or disables (0) full-duplex operation when the utp medium
is specified. The default is to disable full-duplex operation.
The lan_config command allows you to modify the type of medium, speed, and
mode of operation (half- or full-duplex).
You can also use the lan_config command to enable or disable autonegotia-
tion, if the underlying device has this capability. Autonegotiation is a
hardware and software (driver) process that allows determination of the
highest common speed and duplex (half or full) configuration. The permit-
ted combinations of speed and mode of operation in descending order of pre-
cedence, from the highest to the lowest, are:
1000 Mb/s full-duplex
1000 Mb/s half-duplex
100 Mb/s full-duplex
100 Mb/s half-duplex
10 Mb/s full-duplex
10 Mb/s half-duplex
During autonegotiation, for example, if the local interface advertises that
it is capable of 100 Mb/s half-duplex operation, it is by implication also
capable of 10 Mb/s, full-duplex and 10 Mb/s, half-duplex operation. If the
remote interface advertises that it is capable of 10 Mb/s, full-duplex
operation only, the link is established at 10 Mb/s, full-duplex. The
autonegotiation process can take several seconds to complete.
For DE5xx devices (tu), the characteristics managed with the lan_config
command are ordinarily set from the console level via the EWx0_MODE
environment variable. The lan_config command allows you to override this
default and configure the interface as needed after the system is up and
running. For all other devices, you must use the lan_config command to
configure the interface.
Modifications made with the lan_config command do not persist across
reboots of the operating system. To configure the interface or modify the
parameters automatically each time the system is booted, edit the
inet.local file and add the lan_config command entries to it.
You can also use the ifconfig command to set the speed and mode (half- or
full-duplex) either from the command line or in the inet.local file. If
you specify the command in the inet.local file, the command is executed
each time the system is booted.
You can configure only tu interfaces (DE5xx) by setting the appropriate
console environment variables.
1. To switch from aui or bnc to utp full-duplex operation on tu0, enter:
lan_config -i tu0 -m utp -x 1
2. To disable full-duplex operation on tu0, enter:
lan_config -i tu0 -x 0
3. To enable autonegotiation on tu1, limiting capability to 100 Mb/s,
half-duplex operation, enter:
lan_config -i tu1 -a 1 -s 100 -x 0
4. To disable autonegotiation on tu1, forcing 10 Mb/s, half-duplex opera-
lan_config -i tu1 -a 0 -s 10 -x 0
Interfaces: alt(7), ee(7), el(7), fza(7), le(7), ln(7), tra(7), tu(7)