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Chapter 14 Quality of Service (QoS)
P-870HN-51D User’s Guide
186
14.8.2 Traffic Policing Meter Types
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.
Simple Token Bucket is similar to tokens in a bucket to control when traffic can
be transmitted. The bucket is a buffer that temporarily stores outgoing packets
and transmits them at an average rate.
Single Rate Three Color Marker (SRTCM) and Two Rate Three Color Marker
(TRTCM) evaluate incoming packets and mark them with one of three colors which
3 3 1 001110
001100
001010
001000
250~1100
4 4 2 010110
010100
010010
010000
5 5 3 011110
011100
011010
011000
<250
6 6 4 100110
100100
100010
100000
5 101110
101000
7 7 6 110000
111000
7
Table 69 Internal Layer2 and Layer3 QoS Mapping
PRIORITY
QUEUE
LAYER 2 LAYER 3
IEEE 802.1P
USER PRIORITY
(ETHERNET
PRIORITY)
TOS (IP
PRECEDENCE)
DSCP
IP PACKET
LENGTH (BYTE)