Extreme Networks ExtremeWare XOS 11.1, Руководство пользователя

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Quality of Service
ExtremeWare XOS 11.1 Concepts Guide
204
Configuring QoS
NOTE
With software version 11.0, you can create access control lists (ACLs) with QoS actions. The QoS forwarding
information you configured in an ACL takes precedence over QoS configuration using the CLI commands. Refer to
Chapter 11 for more information on ACLs.
To configure QoS, you define how your switch responds to different categories of traffic by creating and
configuring QoS profiles. You then group traffic into categories (according to the needs of the
application, as previously discussed) and assign each category to a QoS profile. Configuring QoS is a
three-step process:
1 Configure the QoS profile.
QoS profile—A class of service that is defined through minimum and maximum bandwidth
parameters and prioritization settings on the BlackDiamond 10K switch or through configuration of
buffering and scheduling settings on the Aspen 8810 switch. The level of service that a particular
type of traffic or traffic grouping receives is determined by assigning it to a QoS profile. The names
of the QoS profiles are QP1 through QP8; these names are not configurable.
2 Create traffic groupings.
Traffic grouping—A classification or traffic type that has one or more attributes in common. These
can range from a physical port to IP Layer 4 port information. You assign traffic groupings to QoS
profiles to modify switch forwarding behavior. Traffic groupings transmitting out the same port that
are assigned to a particular QoS profile share the assigned characteristics and hence share the class of
service.
3 Monitor the performance of the application with the QoS monitor to determine whether the policies
are meeting the desired results.
Configuring QoS on the Aspen 8810 Switch Only
The Aspen 8810 switch allows dynamic creation and deletion of QoS queues, with Q1 and Q8 always
available, rather than the 8 fixed queues on the BlackDiamond 10K switch.
The following considerations apply only to QoS on the Aspen 8810 switch:
●
The Aspen 8810 switch does not support QoS monitor.
●
The following QoS features share resources on the Aspen 8810 switch:
■
ACLs
■
DiffServ
■
dot1p
■
VLAN-based QoS
■
Port-based Qos
●
You may receive an error message when configuring a QoS feature in the above list on the Aspen
8810 switch; it is possible that the shared resource is depleted. In this case, unconfigure one of the
other QoS features and reconfigure the one you are working on.
The next sections describe each of these QoS components in detail.