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.
