
Configuring Differentiated Services
314470-15.5 Rev 00 5-5
Version 15.5.0.0
The following section is new to Chapter 4, “Customizing Differentiated Services”
in Configuring Differentiated Services.
Differentiated Services Code Point (DSCP) Tagging for Router
Generated Packets
Beginning with version 15.5.0.0, BayRS supports Differentiated Services Code
Point (DSCP) tagging of internally generated router packets, such as OSPF Hello
packets. This feature automatically provides Differentiated Services Queue
Management System (DSQMS) queuing for all router generated packets based on
the internal mapping between the DiffServ Code Point tag values and the DSQMS
queues.
This Quality of Service (QoS) enhancement improves the QoS operational model
of the platform by marking router generated packets and providing appropriate
queuing treatment to marked traffic flows by the DSQMS. This QoS enhancement
is based on the Nortel Networks Service Classes (NNSC) and provides default
settings and behaviors for different categories of network traffic. The relationship
between traffic categories, Nortel Networks Service Classes, and DiffServ code
points (DSCPs) is shown in Table 5-1
.
Table 5-1. Relationship between Traffic Categories, NNSC,
and DiffServ Code Points
Traffic Category NNSC DSCP
Critical Control Critical CS7
Network Network CS6
Interactive Premium EF, CS5
Platinum AF4x, CS4
Responsive Gold AF3x, CS3
Silver AF2x, CS2
Timely Bronze AF1x, CS1
Standard DF (CS0)
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