Chapter 4, Chapter – Brocade Multi-Service IronWare QoS and Traffic Management Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare QoS and Traffic Management Configuration Guide
71
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Chapter
4
Configuring Quality of Service for the Brocade NetIron XMR
and Brocade MLX series
This chapter describes how QoS is implemented and configured in the Brocade device. The chapter
contains the following sections:
•
Ingress Traffic Processing through a device – This section describes the QoS operation on
ingress traffic of a Brocade device. Refer to
“Ingress Traffic processing through a device”
•
Creating an Ingress Decode Policy Map – This section describes the policy maps used to
determine the priority and drop precedence values that will be assigned to the packet within
the device. Refer to
“Creating an Ingress decode policy map”
•
Forcing or Merging Priority of a Packet – This section describes how once a packet’s Ingress
priority has been mapped, the values used for processing on the device are determined by
either forcing or merging. Refer to
“Forcing or merging the priority of a packet”
•
Forcing or Merging the Drop Precedence of a Packet – This section describes how once a
packet’s Ingress drop precedence has been mapped, the values used for processing on the
device are determined by either forcing or merging. Refer to
•
Egress Traffic Processing Exiting a device – This section describes the QoS operation on Egress
Traffic of a Brocade device. This process involves marking packets as they leave a device on
the Egress port. Refer to
“Egress Traffic processing exiting a device”
•
Creating an Egress Decode Policy Map – This section describes the policy maps used to
determine the priority and drop precedence values that a packet will carry when it exits the
device. Refer to
“Creating an egress encode policy map”
•
Backward Compatibility with Pre-03.8.00 QoS Configurations – This section describes the how
previous configurations of the QoS feature on Brocade devices work with the enhanced QoS
feature. Refer to
“Backward compatibility with pre-03.8.00”
•
Default QoS Mappings – This section describes the default mappings for the following PCP
Encode, PCP Decode, DSCP Encode, DSCP Decode, EXP Encode and EXP Decode. Refer to
•
Configuring QoS – This section describes all of the procedures required for both Ingress and
Egress QoS Configuration. Refer to
•
Displaying QoS Information – This section describes how to enable and display the following
QoS information: QoS Configuration Information and QoS Packet and Byte Statistics. Refer to
•
Configuring Port-level QoS Commands on LAG Ports – When applying port-level QoS
commands to ports in a LAG, the rules can be different according the configuration as
described in
“Configuring port-level QoS commands on LAG ports”
•
Determining Packet Drop Priority using WRED – Weighted Random Early Detection (WRED)
provides a mechanism for determining which packets to drop in a congested network. This
section describes how WRED works. Refer to