ZyXEL Communications NETATLAS ENTERPRISE -, User Manual

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NetAtlas Enterprise Ethernet Switch Manager User’s Guide
153 Chapter 16 Ethernet Port Configuration
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The following table describes the labels in this screen.
Table 79 Ethernet Port Configuration: Bandwidth Ctrl.
LABEL DESCRIPTION
Active Select this check box to enable bandwidth control on the selected port(s).
You may temporarily deactivate a rule without deleting it by clearing this check box.
Ingress Rate Type the maximum bandwidth allowed in kilobits per second (Kbps) for traffic coming
into this port.
Commited
Rate
Specify the guaranteed bandwidth allowed in kilobits per second (Kbps) for the incoming
traffic flow on a port. The commit rate should be less than the peak rate. The sum of
commit rates cannot be greater than or equal to the uplink bandwidth.
Peak Rate Specify the maximum bandwidth allowed in kilobits per second (Kbps) for the incoming
traffic flow on a port.
Egress Rate Type the maximum bandwidth allowed in kilobits per second (Kbps) for traffic going out
of this port.
Scheme Select Drop (default) from the drop-down list box to discard all incoming packets that
are over the maximum allowable bandwidth on a port.
A concentration of traffic on a port decreases port bandwidth and overflows buffer
memory causing packet discards and frame losses. Flow Control is used to regulate
transmission of signals to match the bandwidth of the receiving port.
The switch uses IEEE 802.3x flow control in full duplex mode and backpressure flow
control in half duplex mode.
IEEE 802.3x flow control is used in full duplex mode to send a pause signal to the
sending port, causing it to temporarily stop sending signals when the receiving port
memory buffers fill. Back Pressure flow control is typically used in half duplex mode to
send a "collision" signal to the sending port (mimicking a state of packet collision)
causing the sending port to temporarily stop sending signals and resend later. Select
this option to enable flow control.
Apply Click Apply to save the changes.