Allied Telesis AT-S63 - Manual (Page 119)

AT-S63 Stack Command Line Interface User’s Guide
Section I: Basic Operations 119
displays N/A, because the MDI/MDIX setting is set automatically on
the port. A value only appears in this field if you disable Auto-
Negotiation on a twisted pair port and set MDI/MDIX manually. This
field does not apply to a fiber optic port. To adjust a port’s MDI/MDIX
setting, refer to “SET SWITCH PORT” on page 108.
ˆ Actual Speed/Duplex - Displays the current operating speed and
duplex mode of a port. This field displays no value (—) if the port does
not have a link to an end node or has been disabled.
ˆ Actual MDI Crossover- Displays the current operating MDI/MDIX
setting of a twisted pair port. This field displays no value (—) if the port
does not have a link to an end node or has been disabled. This field
does not apply to a fiber optic port.
ˆ Flow Control Status and Flow Control Threshold - Displays the status
of flow control on a port. Flow control applies to ports operating in full
duplex mode and is used by a port to stop an end node from sending
packets when its ingress buffer is full. The default setting is disabled.
The threshold marks the point at which flow control is activated. The
threshold is measured in cells of 128 bytes. The range is 1 to 7935
cells. The default value is 7935 cells.To set flow control, refer to
“DISABLE SWITCH PORT FLOW” on page 103, “ENABLE SWITCH
PORT FLOW” on page 105, or “SET SWITCH PORT” on page 108.
ˆ Backpressure Status and Backpressure Threshold - Displays the
status of backpressure on a port. Backpressure applies to ports
operating in half duplex mode. A port uses backpressure to stop an
end node from sending packets when its ingress buffer is full. The
default setting is disabled. The threshold marks the point at which
backpressure is activated. The threshold is measured in cells of 128
bytes. The range is 1 to 7935 cells. The default value is 7935 cells.To
set backpressure, refer to “SET SWITCH PORT” on page 108.
ˆ HOL Blocking Prevention Threshold - Displays the threshold of a head
of line blocking event. This event occurs when a port cannot forward
packets to an egress queue of another stack port because the queue is
full. The stack responds by instructing all ports to discard any packets
in their ingress queues destined for the oversubscribed port. The
threshold is measured in cells of 128 bytes. The range is 0 to 8191
cells. The default is 682.
ˆ Broadcast Ingress Filtering - Displays the status of ingress broadcast
filtering. The feature when enabled on a port discards all ingress
broadcast packets. The default is disabled. To configure this
parameter, refer to “SET SWITCH PORT FILTERING” on page 112.
ˆ Broadcast Egress Filtering - Displays the status of egress broadcast
filtering. If enabled, the port discards all egress broadcast packets. The
default is disabled. To configure this parameter, refer to “SET SWITCH
PORT FILTERING” on page 112.