December 22, 2005 © Foundry Networks, Inc. 13 - 1
Chapter 13
Configuring Quality of Service
Quality of Service (QoS) features are used to prioritize the use of bandwidth in a switch. When QoS features are
enabled, traffic is classified as it arrives at the switch, and processed through on the basis of configured priorities.
Traffic can be dropped, prioritized for guaranteed delivery, or subject to limited delivery options as configured by a
number of different mechanisms.
This chapter describes how QoS is implemented and configured in the FESX, FSX, and FWSX devices. This
chapter contains the topics listed in Table 13.1.
Classification
Classification is the process of selecting packets on which to perform QoS, reading the QoS information and
assigning a priority to the packets. The classification process assigns a priority to packets as they enter the
switch. These priorities can be determined on the basis of information contained within the packet or assigned to
Table 13.1: Chapter Contents
Description See Page
Classification – This section describes how the packets
are classified and mapped into the forwarding queues by
default.
13-1
QoS Queues – This section describes how to assign QoS
priorities to traffic.
13-6
Marking – This process allows you to change the 802.1p
and DSCP information In a packet.
13-8
Configuring DSCP-based QoS – This section describes
how to specify a trust level and enable marking.
13-15
Configuring QoS Mappings – This section describes
how to change the default priority mappings.
13-8
Scheduling – This process allows you to service the
queues according to a mechanism
13-11
Viewing QoS Information 13-15
Viewing DSCP-based QoS Information 13-16
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