[53404] in North American Network Operators' Group
Re: disconnected autonomous systems
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Wed Nov 13 16:14:04 2002
Date: Wed, 13 Nov 2002 21:12:08 +0000 (GMT)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Daniel Golding <dgold@FDFNet.Net>
Cc: Ralph Doncaster <ralph@istop.com>, nanog@merit.edu
In-Reply-To: <20021113150210.S82179-100000@paradox.fdfnet.net>
Errors-To: owner-nanog-outgoing@merit.edu
On Wed, 13 Nov 2002, Daniel Golding wrote:
> I suppose that depends on how many static routes you would need, and how
> many routers you would have to touch.
>
> If you have 10 sites like this, and add or remove several blocks every day
> (an extreme, of course), then you could end up manipulating many statics
> on numerous routers, which, aside from being a waste of engineer time, can
> lead to fat-finger mistakes.
this is a hack whichever way you look at it.. just that its better than a
default and acheives a result more like the contigous AS would have had than an
end user network.. hmm i wonder if this would work if you ibgp peer your
discontigous border routers and use a route-map to make sure the routes point at
your upsteam - would remove the statics and your manual engineering issues.
argh what am i saying.. now i'm promoting this setup!
> Since when did default routing become bad form, on a transit-buying
> network?
if you are a proper ISP with a full routing table you dont need a default and
having one merely sends junk to your upstream, i guess thats chargeable so maybe
they think its a good thing but it doesnt really fit with the various nanog
threads on tidying up bogon packets as they hop around the net.
Steve
>
> - Daniel Golding
>
> On Wed, 13 Nov 2002, Stephen J. Wilcox wrote:
>
> > > Of course, it required you to point default routes out your upstreams, as
> > > you will not see the prefixes from one discontiguous island, in another,
> > > thanks to BGP loop detection.
> >
> > ouch. bad practice defaulting like that, however to static route your individual
> > blocks wouldnt be a problem
> >
> >
>
>
