[27955] in North American Network Operators' Group
Re: The Size of OSPF Network
daemon@ATHENA.MIT.EDU (HANSEN CHAN)
Fri Mar 31 16:49:14 2000
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Date: Fri, 31 Mar 2000 16:44:05 -0500
From: "HANSEN CHAN" <hchan@newbridge.com>
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To: "Daniel L. Golding" <dan@netrail.net>
Cc: nanog list <nanog@merit.edu>
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Thank you for the information.
What I'm also interested is what is the typical number of OSPF area in today's large ISP
backbone (if they are using OSPF, not IS-IS). Anyone has some input?
Thanks,
Hansen
"Daniel L. Golding" wrote:
> Disclaimer: This is a religious issue. This is also an issue that is
> non-operational and should be on PUCK...
>
> 200 routers seems excessive. 50 routers is much more reasonable. The
> important part is to limit external routes being redistributed into OSPF.
> External routes are bad mojo.
>
> Daniel Golding
> Senior Network Engineer
> NetRail, Inc.
> -----------------------
> dan@netrail.net
> (404) 739-4346
>
> On Fri, 31 Mar 2000, HANSEN CHAN wrote:
>
> >
> > Dear all,
> >
> > For the big ISP networks (tier 1 or 2) that happens to use OSPF, what is the typical
> > number of OSPF areas in the network? According to OSPF books, a typical area is
> > consisted of 200 routers. Are those guidelines ever followed in real ISP network
> > deployment?
> >
> > Any input is highly appreciated.
> >
> > Cheers,
> > Hansen
> >
> >
> >
> >
