Patton electronics SmartNode Series Software Configuration Manual page 148

13 • Link scheduler configuration
each stage the branch to be served is chosen until at the level of a leaf the respective class is chosen. This proce-
dure is called hierarchical scheduling.
The hierarchical notation has two advantages:
• It is a clean way of combining different decision criteria
• It can also be a nice way to cope with groups of traffic classes
In figure 32 an example of hierarchical scheduling is illustrated. The 1
queuing to share the bandwidth among source classes VPN, Web and incorporates the traffic from the 2
arbiter Low_Priority, which itself uses shaping to share the bandwidth among source classes Mail and Default.
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 to 512 kbps. 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-
146
Figure 32. Example of Hierarchical Scheduling
SmartWare Software Configuration Guide
st
level arbiter Level_1 uses weighted fair
Link scheduler configuration task list
nd
level