ZyXEL Communications GS-3012F Series - Manual (Page 113)

GS-3012/GS-3012F User’s Guide
113
C
H A P T E R
12
Bandwidth Control
This chapter shows you how you can set the maximum bandwidth allowed for traffic flows on
a port using the Bandwidth Control setup screens.
12.1 Introduction to Bandwidth Control
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.
12.1.2 Bandwidth Control Setup
Click Advanced Application and then Bandwidth Control in the navigation panel to bring
up the screen as shown next.