ZyXEL Communications MES3500 Series, Руководство пользователя

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Chapter 36 Differentiated Services
MES3500 Series User’s Guide
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various traffic policies to the traffic flows. An example traffic policy, is to give higher drop
precedence to one traffic flow over others. In our example, packets in the
Bronze traffic flow are
more likely to be dropped when congestion occurs than the packets in the Platinum traffic flow as
they move across the DiffServ network.
Figure 165
DiffServ Network
36.2 Two Rate Three Color Marker Traffic Policing
Traffic policing is the limiting of the input or output transmission rate of a class of traffic on the
basis of user-defined criteria. Traffic policing methods measure traffic flows against user-defined
criteria and identify it as either conforming, exceeding or violating the criteria.
Two Rate Three Color Marker (TRTCM, defined in RFC 2698) is a type of traffic policing that
identifies packets by comparing them to two user-defined rates: the Committed Information Rate
(CIR) and the Peak Information Rate (PIR). The CIR specifies the average rate at which packets are
admitted to the network. The PIR is greater than or equal to the CIR. CIR and PIR values are based
on the guaranteed and maximum bandwidth respectively as negotiated between a service provider
and client.
Two Rate Three Color Marker evaluates incoming packets and marks them with one of three colors
which refer to packet loss priority levels. High packet loss priority level is referred to as red,
medium is referred to as yellow and low is referred to as green. After TRTCM is configured and
DiffServ is enabled the following actions are performed on the colored packets:
• Red (high loss priority level) packets are dropped.
• Yellow (medium loss priority level) packets are dropped if there is congestion on the network.
• Green (low loss priority level) packets are forwarded.
TRTCM operates in one of two modes: color-blind or color-aware. In color-blind mode, packets are
marked based on evaluating against the PIR and CIR regardless of if they have previously been
marked or not. In the color-aware mode, packets are marked based on both existing color and
evaluation against the PIR and CIR. If the packets do not match any of colors, then the packets
proceed unchanged.
G S B P
S
B
B
G P P S
P - Platinum
G - Gold
S - Silver
B - Bronze
G P P
S
A