Computer Networking › Section E · The network layer: control plane › Topic E.2
Intra-AS routing: OSPF
No router could run Dijkstra over the whole internet, and no ISP wants strangers deciding how traffic crosses its network. The internet therefore splits routing into pieces, and inside each piece the most common choice is OSPF, link-state routing put into practice.
In this topic
- Why routing is split up
- Intra-AS routing
- How OSPF works
- Link weights are the operator's choice
- Worked example: bandwidth-based costs
- Features beyond plain Dijkstra
- Areas and the backbone
- Worked example: a link fails
- Common mistakes to avoid
- Key takeaways
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