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338 Configuring Quality of Service
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CoS to Queue Mapping Table Default Values
CoS mapping is enabled on a per-system basis. The CoS value order is from zero to seven,
where zero is the lowest priority and seven is the highest.
DSCP values can be mapped to priority queues. The DSCP to Queue Mapping Table
Default Values Table contains the default DSCP mapping to forwarding queue values:
DSCP to Queue Mapping Table Default Values
DSCP mapping is enabled on a per-system basis.
QoS Services
After packets are assigned to a specific queue, QoS services can be assigned to the queue(s).
Output queues are configured with a scheduling scheme by one of the following methods:
• Strict Priority—Ensures that time-sensitive applications are always forwarded via an
expedited path. Strict priority allows network administrators to prioritize mission-
critical, time-sensitive traffic over less time-sensitive applications. For example, under
strict priority, voice-over-IP traffic is forwarded before FTP or e-mail (SMTP) traffic.
The strict priority queue is emptied before the traffic in the remaining queues is
forwarded.
7q3
DSCP Value Forwarding Queue Values
0-7 q1 (Lowest Priority)
8-15 q1
16-23 q2
24-31 q2
32-39 q2
40-47 q3
48-55 q3
55-63 q3 (Highest Priority)
CoS Value Forwarding Queue Values