FW: more specific routes in today reality
Koepp, Karsten Karsten.Koepp at lambdanet.net
Wed Nov 7 15:48:20 CET 2001
Vladimir, > -----Original Message----- > From: Vladimir A. Jakovenko [mailto:vovik at lucky.net] > Sent: Wednesday, November 07, 2001 2:34 PM > To: Koepp, Karsten > Cc: 'nurani at ripe.net'; 'lir-wg at ripe.net' > Subject: Re: FW: more specific routes in today reality > > > On Wed, Nov 07, 2001 at 01:55:01PM +0100, Koepp, Karsten wrote: > >Nurani, > > > >I was missing a RIPE NCC hostmaster statement to this e-mail. > >Sascha quoted a hostmaster. > [..skipped..] > ><SNIP> > >> > >> "- If PI is requested for multi-homing please explain why > >> the second > >> provider cannot route PA space as a more specific > >> route (with the > >> PA block holder adding a more specific route too)." > >> > >> This was suggested from a RIPE NCC Hostmaster when sending a > >> PI-space req. This looks a little contrary to your opinion doesn't > >> it? > >> > >> Sascha > >> > > > >Has this been a mistake, or is this the default answer to PI requests > >sent to the NCC nowadays? Is the NCC seriously going to > recommend this > >to the members? > >I don't recommend the use of PI to customers either, and I don't want > >to roll up the multi-homing discussion. But PI should remain > provider- > >independent and PA should remain provider-aggregatable. > > Quote from RFC1930, "Guidelines for creation, selection, and > registration > of an Autonomous System (AS)", page 7: > > "With the introduction of aggregation it should be noted that > a prefix may > be represented as residing in more than one AS, however, this > is very much > the exception rather than the rule". > RFC1930 does not know PA or PI address categories, just routes. > Quote from RFC2725, "Routing Policy System Security", page 9: > > "Route objects may exist for the same prefix with multiple > origin AS values > due to common multihoming practice that does not require a > unique origin AS". RFC2725 does mention PI, but not the case where PA addresses are being multi-homed. All I am saying is, regardless of whether we want this type of multi-homing or not, networks originating from different AS should use PI space. It does neither save a route nor address space to make pieces of a PA block multi-homed. It only binds the network to the provider assigning the PAs. That's why I was up-set. Still waiting for the NCC to answer... Karsten
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