mii-tool - view, manipulate media-independent interface
status
SYNOPSIS
mii-tool [-v, --verbose] [-V, --version] [-R, --reset]
[-r, --restart] [-w, --watch] [-l, --log] [-A, --adver
tise=media,...] [-F, --force=media] [interface ...]
DESCRIPTION
This utility checks or sets the status of a network inter
face's Media Independent Interface (MII) unit. Most fast
ethernet adapters use an MII to autonegotiate link speed
and duplex setting.
Most intelligent network devices use an autonegotiation
protocol to communicate what media technologies they sup
port, and then select the fastest mutually supported media
technology. The -A or --advertise options can be used to
tell the MII to only advertise a subset of its capabili
ties. Some passive devices, such as single-speed hubs,
are unable to autonegotiate. To handle such devices, the
MII protocol also allows for establishing a link by simply
detecting either a 10baseT or 100baseT link beat. The -F
or --force options can be used to force the MII to operate
in one mode, instead of autonegotiating. The -A and -F
options are mutually exclusive.
The default short output reports the negotiated link speed
and link status for each interface. If an interface or
interfaces are not specified on the command line, then
mii-tool will check any available interfaces from eth0
through eth7.
OPTIONS
-v, --verbose
Display more detailed MII status information. If
used twice, also display raw MII register contents.
-V, --version
Display program version information.
-R, --reset
Reset the MII to its default configuration.
-r, --restart
Restart autonegotiation.
-w, --watch
Watch interface(s) and report changes in link sta
tus. The MII interfaces are polled at one second
intervals.
Used with -w, records link status changes in the
system log instead of printing on standard output.
-F media, --force=media
Disable autonegotiation, and force the MII to
either 100baseTx-FD, 100baseTx-HD, 10baseT-FD, or
10baseT-HD operation.
-A media,..., --advertise=media,...
Enable and restart autonegotiation, and advertise
only the specified media technologies. Multiple
technologies should be separated by commas. Valid
media are 100baseT4, 100baseTx-FD, 100baseTx-HD,
10baseT-FD, and 10baseT-HD.
AUTHORS
David Hinds - dhinds@pcmcia.sourceforge.org
Donald Becker - becker@scyld.com
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