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Determining the best Cisco IOS queuing option for your traffic needs involves the following general guidelines (as represented in the Figure):
- Determine whether the WAN is congested.
If no traffic congestion exists, there is no need to sort the
traffic—it is serviced as it arrives. However, if the
traffic load exceeds the transmission capacity for periods of
time, then one of Cisco's IOS-queuing options may be the
solution.
- Decide whether strict control over
traffic prioritization is necessary and whether automatic
configuration is acceptable. Proper queuing configuration is not
necessarily a simple task. To effectively perform this task, the
network manager must study the types of traffic using the
interface, determine how to distinguish them, and decide their
relative priority. This done, the manager must install the filters and test their effect on the traffic. Traffic patterns change over time, so the analysis must be repeated periodically.
- Establish a queuing policy.
A queuing policy results from the analysis of traffic patterns and the determination of the relative traffic priorities discussed in Step 2.
- Determine whether any of the traffic types you identified in your traffic pattern analysis can tolerate a delay.
Queuing: Return Policy
For queuing to be pertinent, the answering router should have the
same queuing policy.
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