Figure 3-8 Traffic Policing With Cir/Pir - Zte ZXR10 5900E Product Description

ZXR10 5900E Product Description
Furthermore, the selection of MPLS tunnel path and hierarchical QoS scheduling can
also be implemented according to message colors. In this way, service precise operation
and management are realized. ZXR10 5900E support CIR/PIR service based upon port
and flow, and they can be used in both incoming and outgoing directions.

Figure 3-8 Traffic Policing with CIR/PIR


Traffic Shaping. It is designed particularly to restrict one stream or abrupt traffic and
make these messages sent out in evenly. Traffic shaping is normally done by cache
and token bucket. When the message is sent in high speed, it will be saved in cache
and then sent out evenly in the control of token bucket. Different from traffic policing,
traffic shaping caches messages that do not match traffic feature, which prevents
messages from being discarded and satisfies message traffic feature at the same
time.

Queue Scheduling. For network unit, when the incoming speed of the packet is
faster than their outgoing speed, congestion will happen at egress. When it occurs,
firstly some messages will be discarded if there's not enough cache space. Also a
resource scheduling mechanism should be made to enable messages to cache in
the queue according to some policies. And then these messages will be taken out
from the queue and forwarded as per some scheduling policies. Congestion
management of the queue is very meaningful to bandwidth distribution, latency and
jitter. ZXR10 5900E support PQ (Priority Queuing),
and PQ+WRR queue scheduling methods.

Congestion Avoidance. Network equipment cache is limited, so queue scheduling
which is one congestion management mechanism carried out in terms of different
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Weighted Round Robin
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(WRR)