Allied-telesis AT-S62 Manual do Utilizador descarregar pdf (Página 612)

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Chapter 35: Port Parameters

Section VIII: Web Browser Management 612

You should note the following concerning the operation of Auto-

Negotiation on the switch port:

❑ In order for a switch port to successfully Auto-Negotiate its duplex

mode with an end-node, the end-node should also be using Auto-

Negotiation. Otherwise, a duplex mode mismatch can occur. A

switch port using Auto-Negotiation will default to half-duplex if it

detects that the end-node is not using Auto-Negotiation. This will

result in a mismatch if the end-node is operating at a fixed duplex

mode of full-duplex.

To avoid this problem, when connecting an end-node with a fixed

duplex mode of full-duplex to a switch port, you should disable

Auto-Negotiation on the port and set the port’s speed and duplex

mode manually.

❑ If you disable Auto-Negotiation on a port, the auto-MDI/MDI-X

feature on a port is also disabled, and the port defaults to the MDI-

X configuration. Consequently, if you disable Auto-Negotiation

and set a port’s speed and duplex mode manually, you might also

need to set the port’s MDI/MDI-X setting as well.

Auto-Negotiate: The port will Auto-Negotiate both speed and

duplex mode. This is the default.

❑ 10Mbps - Half Duplex

❑ 10Mbps - Full Duplex

❑ 100Mbps - Half Duplex

❑ 100Mbps - Full Duplex

HOL Blocking

For a definition of Head of Line Blocking, refer to page 102.

This parameter can prevent Head of Line Blocking from occurring

on a port. The parameter sets a threshold on the utilization of a

port’s egress queue. When the threshold for a port is exceeded,

the switch signals other ports to discard packets to the

oversubscribed port. The number for this value represents cells. A

cell is 64 bytes. The range is 1 to 61,440 cells. The default is 7,168.

Status

You use this selection to enable or disable a port. When disabled,

a port will not accept or forward frames.

You might want to disable a port and prevent packets from being

forwarded if a problem occurs with the node or cable connected

to the port. Once the problem has been fixed, you can enable the

port again to resume normal operation.

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