Summary
In this chapter, you examined various QoS solutions that are employed in building large networks. In particular, you discovered the details of Cisco features that are available for congestion management (FIFO, PQ, CQ, WFQ) and avoidance (WRED, CAR), as well as the means to propagate QoS policy through the network (IP precedence, BGP policy propagation, and RSVP).
Although the various fancy queuing mechanisms and soft-state mechanisms such as RSVP are highly flexible solutions, they consume valuable resources, and current implementations are applicable only to line rates in the low megabits per second. However, the combination of CAR on the perimeter, WRED in the core for congestion avoidance, and BGP for intra/interdomain QoS signaling ...
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