AS690 advisory update

ser-rr at ser-rr at
Tue Nov 14 21:08:28 UTC 1995

What happens if policy changes for those AS'es? 

i.e., AS279 decides to no longer route to AS690 via AS3561, but changes to route through AS701. (*grin*)

How is new policy to be determined, either for new ASes, or for existing ones that drastically change their routing policies?


> Elliot,
> Ignore the advisory.  If AS2 is the origin, we will route traffic
> for that particular prefix/masklen using the most common policy
> already in place for routes in AS2.
> If the common policy is for us to send traffic destined for AS2
> via our peer AS1, we will continue to do so for the new prefix/masklen.
> Steve
> > 
> > > After this time, AS690 advisories will be ignored.  Policy toward
> > > routes registered in the IRR will be based solely on origin AS.
> > > The origin AS will be expanded to the set of route objects registered
> > > for that origin AS; the resulting list of prefixes will be used in
> > > generating router configurations, as today.
> > 
> > in the case of AS#1 routing AS#2, suppose AS#2 sent in the route object 
> > and list themselves as the origin, and put AS#1 in the advisory. in the 
> > new scenario, will ANS now only allow routes coming via the ASN in the 
> > ORIGIN field? i.e. will AS#2 have to change the ANS in the origin field 
> > to AS#1 so ANS knows where to look for for the routes? 
> > 
> > - elliot alby/sprintlink implementation
> > 

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