SNR S2940-8G-v2, Configuration Manual

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SNR S2940-8G-v2 Switch Configuration Guide
QoS Configuration
Chapter 26
QoS Configuration
26.1 Introduction to QoS
QoS (Quality of Service) is a set of capabilities that allow you to create differentiated services for
network traffic, thereby providing better service for selected network traffic. QoS is a guarantee for
service quality of consistent and predictable data transfer service to fulfill program requirements.
QoS cannot generate extra bandwidth but provides more effective bandwidth management ac-
cording to the application requirement and network management policy.
26.1.1 QoS Terms
QoS: Quality of Service, provides a guarantee for service quality of consistent and predictable
data transfer service to fulfill program requirements. QoS cannot generate new bandwidth but
provides more effective bandwidth management according to the application requirement and
network management.
QoS Domain: QoS Domain supports QoS devices to form a net-topology that provides Quality
of Service, so this topology is defined as QoS Domain.
CoS: Class of Service, the classification information carried by Layer 2 802.1Q frames, taking
3 bits of the Tag field in frame header, is called user priority level in the range of 0 to 7.
Layer 2 802.1Q/P Frame
Preamble
Start frame
delimiter
DA SA Tag PT Data FCS
3 bits used for Cos (user priority)
Figure 26.1: CoS priority
ToS: Type of Service, a one-byte field carried in Layer 3 IPv4 packet header to symbolize the
service type of IP packets. Among ToS field can be IP Precedence value or DSCP value.
IP Precedence: IP priority. Classification information carried in Layer 3 IP packet header,
occupying 3 bits, in the range of 0 to 7.
DSCP: Differentiated Services Code Point, classification information carried in Layer 3 IP
packet header, occupying 6 bits, in the range of 0 to 63, and is downward compatible with IP
Precedence.
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