Computer Networking › Section D · The network layer: data plane › Topic D.2
Inside a router
A core router may move hundreds of millions of packets a second, and most packets lost on the internet are dropped inside one. Looking at its parts explains where queues form, why packets are lost and who gets served first.
In this topic
- Four parts of a router
- Input ports and destination-based lookup
- Worked example: longest-prefix match
- Three ways to switch
- Input queues and head-of-line blocking
- Output queues, drops and AQM
- How much buffer is enough?
- Packet scheduling
- Worked example: weighted fair queueing
- Common mistakes to avoid
- Key takeaways
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