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2 posts tagged with "OSPF"

OSPF routing protocol information and design patterns

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Dijkstra in OSPF

· 9 min read
Simon Painter
Simon Painter
Cloud Network Architect - Microsoft MVP

More than just an interview question​

I've sat on both sides of countless technical interviews over my years in networking. There's this familiar dance that happens when discussing OSPF: the candidate confidently states "OSPF uses Dijkstra's algorithm for route calculation," and I'll nod approvingly. But here's the thing - in hundreds of these exchanges, I've never once asked a candidate to explain what that actually means, and no one's ever asked me to explain it either.

Of course it's MTU, but how is it MTU?

· 5 min read
Simon Painter
Simon Painter
Cloud Network Architect - Microsoft MVP

Any time I have to do anything with OSPF I remind myself how it can be so damn awkward about MTU. A little while ago I was busy trying to integrate some Juniper SRX firewalls into a perimeter around some Cisco Nexus 7K and reached a problem that looked like MTU, smelled like MTU, quacked like MTU but we couldn't work out how it was MTU. Here's how it was MTU and what we learned.