Link Scheduler Configuration
117
Figure 15-3: Example of Hierarchical Scheduling
Parts of the configuration used for arbiter
Level_1
are listed below. Take account of the line rate-limit
on the top which is responsible for limiting the overall output o 512 kBit/s. The arbitration uses
weighted fair queuing to share the bandwidth among the two classes VPN and Web and the policy
Low_Priority. The source class local-voice has absolute priority and is therefore effectively bypassing
the link arbiter, as shown in Figure 15-3. The VPN class gets at least 30%, the Web class gets at least
40%, and the Low_Priority policy gets 30% of the overall bandwidth. Moreover there is defined that
a maximum of 50 packets are queued for the source class Web.
profile service-policy Level_1
rate-limit 512
mode wfq
source class local-voice
priority
source class VPN
share 30
…
source class Web
share 40
…
source policy Low_Priority
share 30
Figure 15-4: Service Policy for Level_1 Arbiter
Parts of the configuration used for arbiter
Low_Priority
are listed below. . The arbitration uses
shaping to share the bandwidth between the two classes Mail and Default. Therefore each class gets
just as much bandwidth as assigned, but never more. The source class Mail gets 40% and Default
gets 60% of the remaining bandwidth as defined for arbiter
Level_1
.
profile service-policy Low_Priority
mode shaper
source class mail
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