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network switch

A new network switch with massive 20 times bandwidth capacity that of any switch currently available in market.

Cisco 7000 Network Switch scales beyond 15 terabits per second, with future availability of 40Gb and 100 Gb Ethernet and unified fabric I/O modules.
A More Scalable and Flexible Data Center Switch From Cisco
(Fig. 01: Cisco's 3-1/2-foot-tall box - Nexus 7000 Network Switch [image credit cisco])

More information available here and here.

ethtool or mii-tool 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.

Due to software or hardware (network switch or Ethernet card ) error it may be possible that you need to restarts auto-negotiation on the specified ethernet device.

Restart autonegotiation

You don’t have to reboot Linux box, all you have to do is type the following command :
# ethtool -r eth0
Or you can use mii-tool (outdated, use ethtool only)
# mii-tool -r eth0
Output:
# tail -f /var/log/messages

Jul 16 09:34:25 smtp1 kernel: e1000: eth0: e1000_watchdog_task: NIC Link is Up 10 Mbps Full Duplex
Jul 16 09:34:25 smtp1 kernel: e1000: eth0: e1000_watchdog_task: 10/100 speed: disabling TSO

See also: