ZyXEL Communications XS3800-28, User Manual, Page: 368 / 789

Chapter 52 Bandwidth Control
XS3800-28 User’s Guide
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HAPTER
52
Bandwidth Control
52.1 Bandwidth Control Overview
This chapter shows you how you can cap the maximum bandwidth using the Bandwidth Control screen.
Bandwidth control means defining a maximum allowable bandwidth for incoming and/or out-going
traffic flows on a port.
52.1.1 What You Can Do
Use the Bandwidth Control screen ( Section 52.2 on page 368 ) to limit the bandwidth for traffic going
through the Switch.
52.1.2 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.
52.2 Bandwidth Control Setup
Click SWITCHING > QoS > Bandwidth Control in the navigation panel to bring up the screen as shown
next.
Note: The CIR should be less than the PIR.
Note: The sum of CIRs cannot be greater than or equal to the uplink bandwidth.