User Manual

24-Port and 48-Port Gigabit Ethernet PoE+ Smart Switches with 4 SFP Ports
Configuration Examples User Manual522
• Secondary 802.1p priority value (second/inner VLAN tag)
• Secondary VLAN ID range (second/inner VLAN tag)
• IP Service
Type octet (also known as: ToS bits, Precedence value, DSCP value)
• Layer 4 protocol (TCP
, UDP and so on)
• Layer 4 source/destination ports
• Source/destination IP address
From a DiffServ point of view, two types of classes exist:
• Dif
fServ traffic classes
• Dif
fServ service levels/forwarding classes
DiffServ traffic classes
With DiffServ, you define which traffic classes to track on an ingress interface. You can define
simple BA classifiers (DSCP) and a wide variety of multifield (MF) classifiers:
• Layer 2; Layers 3, 4 (IP only)
• Protocol-based
• Address-based
You can combine these classifiers with logical AND operations to build complex
MF-classifiers.
That is, within a single class, multiple match criteria are grouped together as
an AND expression. Only classes of the same type can be nested; class nesting does not
allow for the negation (exclude option) of the referenced class.
To configure DiffServ, you must define service levels, namely the forwarding classes/PHBs
identified by a given DSCP value, on the egress interface.
You define these service levels by
configuring BA classes for each.
Create policies
Use DiffServ policies to associate a collection of classes that you configure with one or more
QoS policy statements. The result of this association is referred to as a policy.
From a DiffServ perspective, two types of policies exist:
• Traffic Conditioning Policy.
A policy applied to a DiffServ traffic class
• Service Provisioning Policy.
A policy applied to a DiffServ service level
You must manually configure the various statements and rules used in the traffic conditioning
and service provisioning policies to achieve the desired
Traffic Conditioning Specification
(TCS) and the Service Level Specification (SLS) operation, respectively.