Extreme Networks ExtremeWare Command Reference Manual page 430

QoS Commands
To configure QoS, you define how your switch responds to different categories of traffic by creating and
configuring QoS profiles. The service that a particular type of traffic receives is determined by assigning
a QoS profile to a traffic grouping or classification. The building blocks are defined as follows:
• QoS profile—Defines bandwidth and priority parameters.
• Traffic grouping—A method of classifying or grouping traffic that has one or more attributes in
common.
• QoS policy—The combination that results from assigning a QoS profile to a traffic grouping.
QoS profiles are assigned to traffic groupings to modify switch forwarding behavior. The combination
of the traffic grouping and the assigned QoS profile makes an example of a single policy that is part of
policy-based QoS.
Extreme switch products support explicit Class of Service traffic groupings. This category of traffic
groupings describes what is sometimes called explicit packet marking, and includes:
• IP DiffServ code points, formerly known as IP TOS bits
• Priority bits used in IEEE 802.1p packets
All Extreme switches support the standard 802.1p priority bits that are part of a tagged Ethernet packet.
DLCS—"i" Series Switches Only
The Dynamic Link Context System (DLCS) is a feature of ExtremeWare and Extreme "i" series switches
that snoops Windows Internet Naming Service (WINS) NetBIOS packets and creates a mapping
between a user name, the IP address or MAC address of the workstation, and a port on the switch.
Based on the information in the packet, DLCS can detect when an workstation boots up or a user logs
in or out, and dynamically maps the user or workstation name to the current IP address and switch
port. For DLCS to operate within ExtremeWare, the user or workstation must allow automatic DLCS
updates.
Information obtained through DLCS is used by the EPICenter Policy Manager software, and enables the
configuration of policies that apply to named users or workstations. Enabling the DLCS feature is useful
only if you plan to use the EPICenter software. Currently, there are no other features that can make use
of the information that the DLCS feature provides.
The DLCS feature is supported only on the "i" series switches.
430 ExtremeWare 7.5 Command Reference Guide