Bandwidth Control; Chapter 12 Bandwidth Control; Bandwidth Control Overview; Cir And Pir - ZyXEL Communications ZyXEL Dimension ES-4124 User Manual

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H A P T E R
This chapter shows you how you can cap the maximum bandwidth using the Bandwidth
Control screen.

12.1 Bandwidth Control Overview

Bandwidth control means defining a maximum allowable bandwidth for incoming and/or out-
going traffic flows on a port.

12.1.1 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.
The CIR should be less than the PIR.
The sum of CIRs cannot be greater than or equal to the uplink bandwidth.

12.2 Bandwidth Control Setup

Click Advanced Application > Bandwidth Control in the navigation panel to bring up the
screen as shown next.
ES-4124 User's Guide

Bandwidth Control

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