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MII-DIAG(8) System Manager's Manual MII-DIAG(8)
NAME
mii-diag - Network adapter control and monitoring
SYNOPSIS
mii-diag [options]<interface>
DESCRIPTION
This manual page documents briefly the mii-diag network adapter control and monitoring
command. Addition documentation is available from http://scyld.com/diag/index.html.
This mii-diag command configures, controls and monitors the transceiver management regis-
ters for network interfaces, and configures driver operational parameters. For trans-
ceiver control mii-diag uses the Media Independent Interface (MII) standard (thus the com-
mand name). It also has additional Linux-specific controls to communicate parameters such
as message enable settings and buffer sizes to the underlying device driver.
The MII standard defines registers that control and report network transceiver capabili-
ties, link settings and errors. Examples are link speed, duplex, capabilities advertised
to the link partner, status LED indications and link error counters.
OPTIONS
The mii-diag command supports both single character and long option names. Short options
use a single dash ('-') in front of the option character. For options without parameters,
multiple options may be concatenated after a single dash. Long options are prefixed by
two dashes ('--'), and may be abbreviated with a unique prefix. A long option may take a
parameter of the form --arg=param or --arg param.
A summary of options is as follows.
-A, --advertise <speed|setting>
-F, --fixed-speed <speed|setting>
Speed is one of: 100baseT4, 100baseTx, 100baseTx-FD, 100baseTx-HD, 10baseT,
10baseT-FD, 10baseT-HD. For more precise control an explicit numeric register set-
ting is also allowed.
-a, --all-interfaces
Show the status of all interfaces. This option is not recommended with any other
option, especially ones that change settings.
-s,--status
Return exit status 2 if there is no link beat.
-D Increase the debugging level. This may be used to understand the actions the com-
mand is taking.
-g, --read-parameters
Show driver-specific parameters.
-G, --set-parameters value[,value...]
Set driver-specific parameters. Set a adapter-specific parameters. Parameters are
comma separated, with missing elements retaining the existing value.
-v Increase the verbosity level. Additional "-v" options increase the level further.
-V Show the program version information.
-w, --watch
Continuously monitor the transceiver and report changes.
-? Emit usage information.
DESCRIPTION
Calling the command with just the interface name produces extensive output describing the
transceiver capabilities, configuration and current status.
The '--monitor' option allows scripting link beat changes.
This option is similar to --watch, but with lower overhead and simplified output. It
polls the interface only once a second and the output format is a single line per link
change with three fixed words
<unknown|down||negotiating|up> <STATUS> <PARTNER-CAP>
Example output: mii-diag --monitor eth0
down 0x7809 0x0000
negotiating 0x7829 0x45e1
up 0x782d 0x45e1
down 0x7809 0x0000
This may be used as
mii-diag --monitor eth0 |
while read linkstatus bmsr linkpar; do
case $linkstatus in
up) ifup eth0 ;;
down) ifdown eth0 ;;
esac
done
It may be useful to shorten the DHCP client daemon timeout if it does not receive an
address by adding the following setting to /etc/sysconfig/network: DHCPCDARGS="-t 3"
SEE ALSO
ether-wake(8),net-diag(8),mii-tool(8).
Addition documentation is available from http://scyld.com/diag/index.html.
KNOWN BUGS
The --all-interfaces option is quirky. There are very few settings that are usefully
applied to all interfaces.
AUTHOR
The manual pages, diagnostic commands, and many of the underlying Linux network drivers
were written by Donald Becker for the Scyld Beowulf(tm) cluster system.
Scyld Beowulftm September 9, 2003 MII-DIAG(8)
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