Specifications are subject to change without notice.
© 2004 by SURECOM Technology Corporation. All rights reserved.
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2D
3.2.4 Configuration-Qos
QoS (Quality of Service) Configuration is used to configure the QoS control registers. Press the
“F” button to read the status of the registers. Press the “Space” button to set the registers.
There are three options in QoS Configuration and two options in priority queue. You can
enable/disable these functions via marking the columns.
.TOS/Diff Serv. priority
When you enable this function, the switch can recognize TCP/IP Differentiated Services
Codepoint (DSCP) priority information from the DS-field defined in RFC2474. The DS field byte
for IPv4 is the Type-of-Service (TOS) octet, and for IPv6, it is the Traffic-Class octet. The
recommended DiffServ Codepoints is defined in RFC2597 to classify the traffic into different
service classes. This switch can extract the codepoint value of the DS-field from IPv4 and IPv6
packets, and identify the priority of the incoming IP packet as following definitions:
High priority: whose DS-field = (EF,expected forwarding:) 101110
(AF, Assured Forwarding:) 001010; 010010; 011010;
100010(Network Control:) 11x000
Low priority: whose DS-field = others values.
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