Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 334 of 669
DSCP Translation
The DSCP Translation page is available from the
Configuration
>
CoS
>
DSCP Translation
menu path.
DSCP (Differentiated Services Code Point) is a field in the header of IP packets for packet classification
purposes.
The S4224 can operate as a DS boundary which can translate different domains’ DSCP values. It
provides classification to a remapped DSCP value or translates to a new DSCP value on ingress and also
at egress it can remap to a DSCP value along with the ability to set the drop precedence level. To
perform the DSCP translation, the port associated with ingress/egress also needs to enable remarking
accordingly.
This page lets you configure basic QoS DSCP Translation settings. DSCP translation can be performed
on Ingress or Egress.
The displayed settings are explained below.
DSCP
A maximum of 64 DSCP values are supported and the valid DSCP values are
0
to
63
.
The DSCP value can include
BE
,
CSx
,
EFx
, or
AFx
where:
AF
refers to Assured Forwarding is provided in four classes for bursty real time and non-real time
services.
BE
: refers to Standard (Best Effort) forwarding.
CS
refers to the Class Selector (per
EF
refers to the Expedited Forwarding (
). The EF PHB has the characteristics of low
delay, low loss and low jitter. These characteristics are suitable for voice, video and other real-
time services.
Three fundamental forwarding behaviors are defined for general use by IETF
: basic
Default Forwarding (DF) behavior for elastic traffic, Assured Forwarding (AF) behavior, and Expedited
Forwarding (EF) behavior for real-time (inelastic) traffic. For additional information see the RFC at
http://tools.ietf.org/html/rfc4594