CCIE

OSPF converges fast. That is its whole reason for existing. But "fast" is a tuning decision, and the

The CCIE troubleshooting section does not ask you to explain BGP. It hands you a broken network and a clock.

Here is a problem that a great many service providers had, and some still have: a fully working, fully tuned,

BGP installs one best path. That is the default and it is deliberate: BGP is a policy protocol, and the

Most networks use BGP communities the way most people use a junk drawer: things get put in, nobody agrees what

BGP route dampening is one of the few networking features with a genuine story arc: invented to save the internet,