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Appendix K
CDM-760 Advanced High-Speed Trunking Modem
When you enable the Filter option for a rule, all packets that meet this classification rule will be
discarded.
K.3.3.3 DiffServ Mode
DiffServ (Differentiated Services) QoS mode is fully compliant with RFC standards. In this mode,
the system automatically configures the rules with dSCPC code points, priority values, and
WRED. You can only configure the service rate and drop precedence levels for Assured
Forwarding (ASFD) classes.
K.4
Weighting
K.4.1
Overview
This section describes weighted QoS scheduling in addition to the round-robin scheduling for
queues. You may enter the weights while configuring queues, similar to configuring other QoS
parameters such as Min BW (minimum bandwidth), Max BW (maximum bandwidth), Priority,
etc.
K.4.2
Weights
Weight is a user-configurable parameter. Enter a weight in the range from 1 to 100. You cannot
assign a null value (0) – this is invalid. The default value is 100. The scheduler drains more data
from a weight=8 queue than a weight=7 queue under the same priority, and so on.
Weights are applicable in Min/Max and Max/Priority mode. However, when Max/Priority Mode
is selected as the QoS mechanism, weights are considered only if multiple queues are
configured in same priority group, and at least one of the weight entries is different from the
others. When queue weights are the same within the same priority group, that group is handled
by round-robin scheduling.
K.4.2.1 Order of Scheduling
For Max/Priority Mode – Weights are applied to all queues that have not reached the assigned
Max BW limit.
Once the Max BW has been reached, the scheduler will not drain any more data irrespective of
the weights.
For Min/Max Mode – The Min BW is served first. Once the minimum BW is met, then the
weights are applied until the Max BW is met. Once the max BW is reached, the scheduler will
not drain any more data irrespective of the weights
K–5
Revision 4
MN-CDM760
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