User's Manual

Technical Notes – QoS Features on BES50

High-level Description of QoS Treatment in BES50

A central element for providing different QoS treatment is the concept of traffic priority and traffic classes. When

an incoming Ethernet frame arrives at an ingress port, BES50 first determines the priority/CoS (value between 0

– 7) of the incoming frame based on the L2/L3 information carried in the Ethernet frame and/or the IP payload.

Each priority/CoS (basically 802.1p bit value) maps into one of the traffic class (4 classes for BES50FE and 8

classes for BES50GE).

BES50 provides a default priority to traffic class mapping. The priority to traffic mapping for BES50FE and

BES50GE are depicted in the following table.

Traffic Class

Priority/CoS

BES50FE BES50GE

0 1 2

1 0 0

2 0 1

3 1 3

4 2 4

5 2 5

6 3 6

7 3 7

Table 1: BES50 Priority to Traffic Class Mapping

This mapping is also user configurable if the user desired to use a different setting. To review and/or configure

the priority to traffic class mapping, navigate to the Applications > Priority > Traffic Classes panel