Qos - Zte ZXR10 5900E Product Description

3.2.12 QoS

Due to the increasing growth of multiple services (data, voice, video) and their different
requirements for service real-time capability (latency, jitter and packet loss rate) and
sensitivity of service reliability, nowadays networks are demanded to be able to
differentiate services, ensure user's service quality according to SLA, realize QoS
guarantee in all implementation models, provide end-to-end service quality, make the
network appreciable and service manageable, realize service precise operation and
finally improve user's service experience.
3.2.12.1 Basic QoS Feature
ZXR10 5900E support rich QoS features where Diffserv model known for its simple
configuration, superior flexibility and high extensibility wins the most extensive use.
ZXR10 5900E have the following Diffserv QoS features:

Traffic Classification and Marking. Service messages are divided into multiple
priorities or categories on the basis of service classification policy (including VLAN,
802.1P, DSCP, MAC address, IP address, TCP/UDP port number, and DSCP info.),
then these categories will be marked by ToS or DSCP fields of Ethernet message
CoS
scheduling, congestion management and traffic shaping can be implemented.
Different QoS mechanisms can be used on different types of service.

Traffic Policing. It is particularly used to restrict one stream or abrupt traffic which is
going to access one network. After setting a reasonable limit to the traffic, it will then
police or punish the exceeding part of the message, for example, discard the
message, color the message or reset the priority of the message. In this way, it
protects network resource and operators greatly at the same time.
Following srTCM (Single Rate Three Color Marker) and trTCM (Two Rate Three Color
Marker) algorithms introduced by IETF, ZXR10 5900E use two token buckets to evaluate
the arrived messages. Compare messages according to CIR/PIR mode of token bucket
in Color-Blind mode and Color-Aware mode, and color the part exceeding PIR red, the
one exceeding CIR but under PIR yellow, and the one under CIR green. Hence, queue
scheduling and congestion management can be done in terms of message colors.
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or IP head, or EXP field of MPLS. In this way, category-based traffic
ZXR10 5900E Product Description
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