Chapter 14 Quality of Service (QoS)

Table 69 Internal Layer2 and Layer3 QoS Mapping

 

LAYER 2

LAYER 3

 

 

PRIORITY

IEEE 802.1P

TOS (IP

 

IP PACKET

QUEUE

USER PRIORITY

DSCP

 

(ETHERNET

PRECEDENCE)

LENGTH (BYTE)

 

PRIORITY)

 

 

 

3

3

1

001110

250~1100

 

 

 

001100

 

 

 

 

001010

 

 

 

 

001000

 

 

 

 

 

 

4

4

2

010110

 

 

 

 

010100

 

 

 

 

010010

 

 

 

 

010000

 

 

 

 

 

 

5

5

3

011110

<250

 

 

 

011100

 

 

 

 

011010

 

 

 

 

011000

 

 

 

 

 

 

6

6

4

100110

 

 

 

 

100100

 

 

 

 

100010

 

 

 

 

100000

 

 

 

 

 

 

 

 

5

101110

 

 

 

 

101000

 

 

 

 

 

 

7

7

6

110000

 

 

 

 

 

 

 

 

7

111000

 

 

 

 

 

 

 

 

 

 

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

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P-870HN-51D User’s Guide