OSPF
OSPF floods link-state advertisements so every router holds the same map and runs Dijkstra itself, with areas bounding the database. It is the default IGP question in network interviews.
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- Link-State Model5 questions
- Areas and LSA Types6 questions
- Adjacency and DR/BDR6 questions
- SPF Computation4 questions
- Metrics and Convergence5 questions
- OSPFv36 questions
questions
page 2 of 2What does an OSPFv3 Link-LSA carry, why is it flooded only on its own link, and which routers use it?
level: seniorimportance: nice to knowfreq 9%
basics
~20 sAn OSPFv3 Link-LSA (LS type 0x0008) carries a router's link-local address, the IPv6 prefixes on that link, its priority and the Options it wants in the DR's network-LSA. Only routers on that link use these, so it never leaves the link.
How would you design OSPF link costs for a network mixing 100 Gb/s core links, 10 Gb/s access links and slow WAN circuits?
level: principalimportance: nice to knowfreq 8%
basics
~10 sChoose one deliberate OSPF cost scheme and apply it everywhere: a reference bandwidth above the fastest link that keeps the slowest inside the 16-bit cost field, or role-based costs that encode latency and intent.
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