ZyXEL Communications XGS-4526 - Manual (Page 147)

XGS-4526 User’s Guide
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Bandwidth Control
This chapter shows you how you can cap the maximum bandwidth using the
Bandwidth Control screen.
14.1 Bandwidth Control Overview
Bandwidth control means defining a maximum allowable bandwidth for incoming
and/or out-going traffic flows on a port.
14.1.1 CIR and PIR
The Committed Information Rate (CIR) is the guaranteed bandwidth for the
incoming traffic flow on a port. The Peak Information Rate (PIR) is the maximum
bandwidth allowed for the incoming traffic flow on a port when there is no network
congestion.
The CIR and PIR should be set for all ports that use the same uplink bandwidth. If
the CIR is reached, packets are sent at the rate up to the PIR. When network
congestion occurs, packets through the ingress port exceeding the CIR will be
marked for drop.
Note: The CIR should be less than the PIR.
Note: The sum of CIRs cannot be greater than or equal to the uplink bandwidth.