Allied Telesis AT-A16 Manual do Utilizador descarregar pdf (Página 6)

3-6 AT-8600 Series Software Reference

Software Release 2.6.4

C613-03081-00 REV A

To display information about switch ports, use the command:

SHOW SWITCH PORT[={port-list|ALL}]

Autonegotiation of port speed and duplex mode

Each of the switch ports can operate at either 10 Mbps or 100 Mbps, in either

full duplex or half duplex mode. In full duplex mode, a port transmits and

receives data simultaneously. In half duplex mode, the port either transmits or

receives, but not at the same time. This versatility makes it possible to connect

devices with different speeds and duplex modes to different ports on the

switch. This versatility also requires that each port on the switch know which

speed and mode to use.

Autonegotiation allows the ports to adjust their speed and duplex mode to

accommodate devices connected to them. Each switch port can be either

configured with a fixed speed and duplex mode, or configured to

autonegotiate speed and duplex mode with a device connected to it to

determine a speed and mode that allows successful transmission. An

autonegotiating port adopts the speed and duplex mode required by devices

connected to it. If another autonegotiating device is connected to the switch,

they negotiate the highest possible common speed and duplex mode. Setting

the port to a fixed speed and duplex mode allows it to support equipment that

cannot autonegotiate.

If you override a port’s autonegotiation by setting it to a fixed speed/duplex

setting, automatic MDI/MDI-X detection is also overridden. The port defaults

to MDI-X.

It is also possible to require a port to operate at a single speed without

disabling autonegotiation by allowing the port to autonegotiate but constrain

the speed/duplex options to the desired combination. For example, if one end

of a link is set to AUTO and the other to 100MFULL, then the AUTO end selects

100MHALF operation because without the other end autonegotiating, the

AUTO end has no way of knowing that the fixed end is full duplex capable. If a

particular speed is required, it is better to fix the speed/duplex combination

using one of the autonegotiating speed values. Therefore, using 100MFAUTO

at one end of a link allows the AUTO end to autonegotiate 100MFULL.

Switch ports autonegotiate by default when they are connected to a new

device. To change this setting, use the command:

SET SWITCH PORT={port-list|ALL} SPEED={AUTONEGOTIATE|10MHALF|

100MFAUTO|1000MHALF|1000MFULL|1000MHAUTO|1000MFAUTO}

Settings available on different models are shown in Table 3-1 on page 3-7.

Autonegotiation can also be activated at any time after this, on any port that is

set to autonegotiate by using the command:

ACTIVATE SWITCH PORT={port-list|ALL} AUTONEGOTIATE

The SHOW SWITCH PORT command displays the port speed and duplex

mode settings.

1 2 3 4 5 6 7 8 9 10 11 ... 153 154

Comentários a estes Manuais

Sem comentários

Allied Telesis AT-A16 Manual do Utilizador Página 6

Comentários a estes Manuais

Manuais e produtos relacionados com Comutadores de rede Allied Telesis AT-A16