> > > > > With link-state, one interface flap can mean doing SPF on every route. > > > > > > > > Only if you learned every one of your routes from different neighbor. > > > > If you have two exits and 100000 routes, you calculate twice and > > > > apply the results to the prefixes. > > > > > > > > Note that this does not apply to a proprietary, "hybrid", semi-link > > > > state protocol marketed with name "EIGRP" where all routes need > > > > per-prefix calculation. (OSPF and IS-IS work fine) > > but.. with SPF you need to run the algorithm on all paths for each flap and then > see what that does to your routes > > with eigrp you only need to apply the algorithm to any route on the link that > flapped and then only on the attached router (which will propogate much like bgp > if it requires other routers to recalculate) > > yes thats bad if yuo have 100000 routes but you shouldnt have! assuming a > smaller routing table yuo get quicker convergence and much much less CPU > requirement on your rotuers
And with nailed BGP routes you dont need additional layer of complexity. Alex