PRDB retirement (and note about AS690 advisories)
heimlich at ans.net
Tue May 2 16:48:33 UTC 1995
> I am not sure that nanog is the right place for this, since it affects
> folk outside North America.
True, but I couldn't think of a better list.
> On Tue, 2 May 1995, Steve Heimlich wrote:
> > New registered prefixes will assume the current majority policy toward
> > the home AS in which they're registered.
> What if the current majority policy for that AS is that most nets did not
> have NSFNet routing, and are announced to ANS via the CIX? It might make
> more sense to exclude non-NSFNet routes when determining the majority
This will take some time to clean up. See below...
> Many folk have routes that did not have NSFNet routing and that were
> announced to ANS via the CIX (with aslist 1:1957). What should be done
> with those? Should we send in new NACRs to change the aslist?
Well, the best thing I can think of is 1) we get rid of metric:as
lists and 2) we modify our aut-num object on a per-AS basis to
clean out exceptions like these routed only via the CIX, so that
we route to them via major interchange points (MAE-East, Sprint
NAP, MAE-West, Pac Bell NAP, ...). We probably don't want to do
this until we axe the metric:as lists (so that we just do it once,
on an AS-basis).
> Some non-NSFnet aggregates contain more-specific routes that do (or
> rather, did) have NSFNet routing. How soon can we withdraw the
> more-specifics? I fear that bad things will happen if we withdraw the
> more-specifics without first changing the aslist on the aggregate.
In theory, immediately, though I agree that we should clean up/remove
the advisories first as the more conservative approach while getting
routing right for the aggregates. I'd hate to change all of those
since I know they're going away Real Soon.
> How will ANS's new routing policy affect the peering between ANS and the
> CIX? Is it still prohibited for ANS to hear the same route both through
> the CIX and through a non-CIX connection? Should CIX members send in
> new NACRs that include as1957 in aslists where it was not previously
> included, or will ANS figure out something suitable without needing a
> lot of new NACRs?
We'll figure out something suitable and try to avoid metric:aslist
shifts -- not overnight, but as part of this whole process of
rationalizing policy. As I mentioned above, the most conservative
approach will be to knock off ASes for which we have partial routing
through the CIX one at a time.
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