Allied Telesis AT-9000/12POE, AT-9000/28POE AT-9000 Gigabit Ethernet Switch Installation Guide

AT-9000 Gigabit Ethernet Switch Installation Guide

The default speed setting for the ports is Autonegotiation. This setting is appropriate for ports connected to host devices that also support Autonegotiation.

The default speed setting of Autonegotiation is not appropriate for ports connected to 10/100Base-TX host devices that do not support Autonegotiation and have fixed speeds. For those switch ports, you should disable Autonegotiation and set the port’s speed manually to match the speeds of the host devices.

The 10/100/1000Base-T ports must be set to Autonegotiation, the default setting, to operate at 1000Mbps.

The default duplex mode setting for the ports is Autonegotiation. This setting is appropriate for ports connected to host devices that also support Autonegotiation for duplex modes.

The default duplex mode setting of Autonegotiation is not appropriate for ports connected to host devices that do not support Autonegotiation and have a fixed duplex mode. You should disable Autonegotiation on those ports and set their duplex modes manually to avoid the possibility of duplex mode mismatches. A switch port using Autonegotiation defaults to half-duplex if it detects that the end node is not using Autonegotiation, which can result in a mismatch if the end node is operating at a fixed duplex mode of full-duplex.

If the switch will have a static or an LACP port trunk, create the trunk first using the switch’s management software before connecting the cables of the trunk. Otherwise, a network loop will result, which can adversely affect network performance.

If your network topology contains a loop in which two or more host devices can communicate with each other over more than one network path, do not connect the network cables forming the loop until after you have activated a spanning tree protocol on the switch. Data loops can adversely affect network performance. For background information on the different types of spanning tree protocols supported by the switch, refer to the AT-9000 Series Web User Guide.

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