Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 336 of 669
DSCP Classification
The DSCP Classification page is available from the
Configuration
>
QoS
>
DSCP Classification
menu
path. The DSCP Classification page lets you configure the mapping of QoS class and Drop Precedence
Level to DSCP value.
The displayed settings are explained below.
QoS Class
Actual QoS class (
0
-
7
).
DSCP
Select the classified DSCP value (
0
-
63
).
DPL
: For Drop Precedence Level DP0 and DP1. Every incoming frame is classified to a
Drop Precedence Level (DP level), which is used throughout the device for providing
congestion control guarantees to the frame according to what was configured for that
specific DP level. A DP level of 0 (zero) corresponds to 'Committed' (Green) frames. A DP
level of 1 or higher corresponds to 'Discard Eligible' (Yellow) frames.
DSCP
: The DiffServ standards define 64 DSCP values. Some of them are recommended
for marking particular classes of QoS services (e.g., a value of 46 is usually recommended
for real-time traffic with the strictest latency requirements). The maximum number of
supported DSCP values is 64.
In the DSCP column, the DSCP value can be
BE
,
CSx
,
EFx
, or
AFx
where:
AF
refers to Assured Forwarding.
BE
: refers to Standard (Best Effort) forwarding.
CS
refers to the Class Selector (per
EF
refers to the Expedited Forwarding (
).
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
Buttons
Save
: Click to save changes.
Reset
: Click to undo any changes made locally and revert to previously saved values.