Extreme Networks ExtremeWare Command Reference Manual page 380

QoS Commands
• 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. When assigned to
a traffic grouping, the combination of the traffic grouping and the QoS profile comprise 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 referred to as explicit packet marking, and includes:
• IP DiffServ code points, formerly known as IP TOS bits
• Prioritization 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
The Dynamic Link Context System (DLCS) is a feature of ExtremeWare and Extreme 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 for 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 only
useful 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.
380 ExtremeWare Software 7.3.0 Command Reference Guide