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Inside Cisco IOS Software Architecture by Russ White, Curtis Murphy, Vijay Bollapragada

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Chapter 5. Particle-Based Systems

This chapter covers the following key topics:

Buffer Management Using Particles

The Cisco 7200 Series Routers

Packet Switching on the Cisco 7200 Series Routers

All the packet buffering schemes discussed so far have one thing in common: they carve up pools of various-sized buffers, and then allocate one buffer per packet. These types of buffers often are called contiguous buffers because the entire contents of a packet reside in a single buffer in one contiguous area of memory. Buffers either are sized to accommodate the largest packet possible on an interface or they’re sized according to a fixed schedule.

Although contiguous buffers are easy to manipulate, they don’t always provide the most efficient ...

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