3Com 3C13636 Configuration Manual page 1364

Router 3000 ethernet family

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3Com Router 3000 Ethernet Family

Configuration Guide

Expedited forwarding (EF) that does not consider whether the link is shared by

other traffic streams. It is suitable for priority services requiring low latency, low

loss ratio, small jitter, and assured bandwidth. One example is virtual leased lines.

Assured forwarding (AF). It is subdivided into four classes, AFs 1 through 4, each

having three drop precedence levels allowing for further AF service discrimination.

The QoS level of AF is lower than EF.

Class selector (CS) compatible with IP precedence. It evolved from the IP ToS

field and has eight classes.

Best effort (BE) is a special case of CS; it provides no guarantee. AF traffic could

be assigned to BE once exceeding the specified limit. All IP traffic is assigned to

the BE PHB group by default.

The following table gives the possible DSCP values.

Table 5-2 DSCP values

3Com Corporation

Chapter 5 Protocol Packet Priority Configuration

DSCP value (binary)

DSCP value (decimal)

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3c13636-us - router 3036 3000 series