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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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4-3. Ethernet

  • Autonegotiation of link speed and duplex mode for 10/100/1000BASE-T is possible through the functions standardized in IEEE 802.3u and 802.3ab. The two endpoints of a connection exchange capability information and choose the highest common speed and duplex supported by both.

  • Ethernet ports are referenced by module and port numbers (mod/port) on COS switches and by interface type and number (interface and one of ethernet, fastethernet, gigabitethernet, or tengigabitethernet) on IOS switches.

  • If certain problems are detected on a port, the switch automatically moves that port into the errDisable or “error disabled” state. This minimizes the effect that the problem port could have on the rest of the network.

  • Ports in errDisable can be ...

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