CDM-840 Remote Router MN-CDM840
Appendix J Revision 3
J–17
J.2.2.4 QoS Group DiffServ Control Mode
QoS Group DiffServ is fully compliant to RFC standards. In DiffServ Control Mode, the system
automatically configures the rules with DSCP code points, priority values, and WRED. You may
only configure the service rate and drop precedence levels for Assured Forwarding (ASFD)
classes.
Use the CDM-840 HTTP Interface ‘Configuration | WAN | QoS’ page for complete management
of the DiffServ features. Figure J-5 shows the page appearance with DiffServ as the selected QoS
Control Mode.
Figure J-5. CDM-840 HTTP Interface – Configuration | WAN | QoS Page Example
(Control Mode = DiffServ)
J.2.2.4.1 DiffServ Operational Examples
Figure J-5 shows the DiffServ QoS Rule Table. During congestion, the QoS engine first services
the prioritized Class Selector 1 through 7 queues (see the “Priority” and “Per-Hop Behavior
(PHB)” columns); any remaining capacity is then "shared" among the Assured Forwarding
Classes 1 through 4 (AF 1-4) and the Default class.
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