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MII-TOOL(8) MII-TOOL(8)

NAME
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 ...]

NOTE
This program is obsolete. Valid media are only 100baseT4, 100baseTx-FD,100baseTx-HD, 10baseT-FD and 10baseT-HD ethernet
cards. For replacement check ethtool.

DESCRIPTION
This utility checks or sets the status of a network interface's Media Independent Interface (MII) unit. Most fast ether-
net 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 support, 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 capabilities. Some passive devices, such as single-speed hubs, are unable to autonego-
tiate. 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 autone-
gotiating. 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 inter-
faces 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 status. The MII interfaces are polled at one second intervals.

-l, --log
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 opera-
tion.

-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.