Qos Technology For Zxr10 59/52 Switch Series - Zte ZXR10 5900 Product Description

ZXR10 5900 5200 Product Description
The key characteristic of DiffServ is simple, effective, and highly scalable. It implements
aggregation mechanism to aggregate several service flows with similar attributes and
provide service for the whole aggregated stream instead of each single service flow.
That is to say, the DiffServ edge network equipment maintains per-flow state. The core
network equipment only forwards packets without maintaining state information. This
kind of core-stateless structure has high scalability.
DiffServ greatly reduces signaling overhead and put emphasis on stream aggregate with
a set of "PHB" (Per-Hop-Behavior) which is applicable for whole service network. We
can classify the data flows according to pre-determined rules, so that we can aggregate
numerous application data flow into a few levels of data flows. Specifically, border nodes
classify, shape, mark and aggregate service flows into different stream aggregate based
on user stream profile and resource reservation. Stream aggregate information is
included in DSCP mark domain of packet IP header. Core network equipment would
take stream aggregate as service object when performing scheduling and forwarding of
IP packets. This process is called PHB, which is actually a relative priority mechanism.
3.19.2

QoS Technology for ZXR10 59/52 switch series

The ZXR10 59/52 switch series provide comprehensive QoS support for IP DiffServ
solution, and are completely compatible with the related standards of the IETF DiffServ
solution, including RFC2474, RFC2475, RFC2497, and RFC2498. These products
support IP Precedence or DSCP as the QoS in-band identifications, and support
DiffServ-related functional components such as the flow controllers (including classifier,
marker, measurement unit, and shaper) and various PHBs (congestion management
and congestion avoidance).
The QoS of the Ethernet switches feature the following:
Packet Classification

 Priority Marking
Congestion Management

Congestion Avoidance

Traffic Policing

Traffic Shaping

Physical interface total rate limiting

3.19.2.1 Packet Classification and Priority Marking
Packets Classification is to classify data packets into a number of priority levels or ToS
(Type of Service). For example, packets can be classified into up to eight types, with
packets marked with first three bit (IP priority) of the Type of Service (ToS) field of the IP
packet header, or into at most 64 types with the packets marked with Differentiated
Services Code Point (DSCP, the first six digits of the ToS field). When the packets have
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