[c-nsp] OSPF design

[Christopher.Marget at usc-bt.com]

> I reckon separating the network into
> different OSPF areas without summarization at ABR cannot minimize OSPF
> database, all routers still receive routes advertises by other routers.

Not true.  All /prefixes/ will still be visible in all areas without summarization, but you'll still minimize the LSDB because type 1 and 2 LSAs never cross an area boundary.

Also, several commenters have indicated concern / no concern with running the SPF algorithm in a large area.

According to Jeff Doyle, control plane performance concerns are not related to  running Dijkstra, but rather lie in LSDB maintenance:  Keeping track of timers and such.

/chris