What is the meaning of mii-tool eth0 in redhat?

Answer 1

This utility checks or sets the status of a network interface'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 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 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.

( copied and pasted from manual)