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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: IGP Comparison (Summary of Responses)
On Tue, Jan 05, 1999 at 09:13:18PM -0600, Sean Donelan wrote: > [email protected] (Randy Bush) writes: > >> Most of the large ISPs in the US run IS-IS as their IP IGP. > >> In europe a number of PTTs have chosen IS-IS as the IGP for their new > >> IP Internet backbones. That might be an indication if IS-IS is dead. > > > >hypothesis: big isps talk less. except a few loudmouths <g>, and when jhawk > >gets pissed off <g^2>. > > I know why most of the older large ISPs use IS-IS, because it was the > only option that worked at the time. But now that some router vendors > have come out with workable OSPF implementations, I've been wondering > which road the new ISP competitors would take. So far, they've been > hiring all the engineering staff away from the older ISPs. And then > the engineers set up the new network with the same skills, meaning IS-IS. > > But what if you started from a clean slate... I know of one new network planned by people originally most familiar with OSPF that is now running IS-IS. It did start out as OSPF allright, but when you go beyond 200+ routers in area 0 within 6 months (and still growing) you start wondering whether you shouldn't take a different approach -- and thats when IS-IS comes in handy. > If you didn't have an installed base, and didn't already know one or > the other, which would you choose? Or just punt, and use iBGP.... I guess it depends on how large you plan to get :-) - and yes, I know, that OSPF scales quite well if you design it carefully WRT areas, but so does IS-IS... Another way to look at it would be that you could keep on making sloppy networkdesign far longer in an IS-IS network than you could with OSPF ;) > -- > Sean Donelan, Data Research Associates, Inc, St. Louis, MO > Affiliation given for identification not representation /Niels Chr. -- Niels Christian Bank-Pedersen, NCB1-RIPE. Network Manager, Tele Danmark NET, IP-section. # rsh -l God universe.all find / -name '*windows*' -exec rm -rf {} \\;
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