Allied Telesis AT-S62 - Manual (Page 150)

Chapter 7: Port Parameter Commands
150 Section I: Basic Operations
field does not apply to a fiber optic port. To adjust a port’s MDI/MDIX
setting, refer to “SET SWITCH PORT” on page 136.
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 129, “ENABLE SWITCH
PORT FLOW” on page 132, or “SET SWITCH PORT” on page 136.
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. To set backpressure, refer to “SET SWITCH
PORT” on page 136.
ˆ HOL Blocking Prevention Threshold - Displays the threshold at which
the switch signals a head of line blocking event. This event occurs
when switch ports are unable to forward packets to another switch port
because its egress queues are full. The switch responds to this event
by instructing the other switch ports to discard any packets in their
ingress queues that are destined for the oversubscribed port. To set
this threshold, refer to “SET SWITCH PORT” on page 136.
ˆ Broadcast Filtering - Displays the status of broadcast filtering. If
enabled, the port discards all ingress broadcast packets. The default is
disabled. To configure this parameter, refer to “SET SWITCH PORT”
on page 136.
ˆ Broadcast Rate Limiting Status - Displays the status of broadcast rate
limiting. If enabled, the port has a threshold as to the maximum
number of ingress broadcast packets it will accept. The default is
disabled. To configure this parameter, refer to “SET SWITCH PORT
RATELIMITING” on page 141.
ˆ Multicast Rate Limiting Status - Displays the status of multicast rate
limiting. If enabled, the port has a threshold as to the maximum
number of ingress multicast packets it will accept. The default is
disabled. To configure this parameter, refer to “SET SWITCH PORT
RATELIMITING” on page 141.