Hi Les, Let's open a bit of imagination and assume one day we progress https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-extended-hierarchy-06
Do you think this is wise to blast UPAs everywhere in all 8 levels when perhaps it is needed only on a few egress nodes sitting in one specific area of say level 4 ? I do understand your statement that since we are creating summaries we are the problem and need to fix it but let's not forget that summaries are created by operators and such operators can use other tools to signal holes in them. Both droid and bgp based models have been discussed yet UPA is being pushed. It seems that UPAs are example of very good marketing skills :). Cheers, Robert On Tue, Apr 22, 2025 at 4:35 PM Les Ginsberg (ginsberg) <ginsberg= [email protected]> wrote: > I support progression of the UPA draft. > > > > It leverages an existing mechanism in the protocols to provide needed > functionality - which has been proven viable by multiple implementations. > > > > As I have commented in the past, I do wish the definition of the flags was > modified so they were not mutually exclusive. This model leads to the > inability to add additional related flags in the future without creating a > backwards compatibility issue. > > > > Regarding concerns expressed by other WG members as to the appropriateness > and scalability of the mechanism defined here: > > > > I think the draft is careful in defining how the mechanism should be used > so > > as to avoid scalability issues. I also think no one has offered an > alternative which is more scalable. > > Given IGPs already advertise reachability, summaries, and unreachability, > this mechanism is clearly an appropriate use of the IGPs. > > > > Les > > > > *From:* Yingzhen Qu <[email protected]> > *Sent:* Thursday, April 17, 2025 11:13 AM > *To:* lsr <[email protected]>; lsr-chairs <[email protected]> > *Subject:* [Lsr] WG Last Call for > draft-ietf-lsr-igp-ureach-prefix-announce (4/17/2025 - 5/2/2025) > > > > Hi, > > > > This email begins a 2 week WG Last Call for the following draft: > > IGP Unreachable Prefix Announcement > > https://datatracker.ietf.org/doc/draft-ietf-lsr-igp-ureach-prefix-announce/ > > > > Please review the document and indicate your support or objections by May > 2nd, 2025. > > > > Authors and contributors, > > Please indicate to the list your knowledge of any IPR related to this work. > > > > Thanks, > > Yingzhen > > _______________________________________________ > Lsr mailing list -- [email protected] > To unsubscribe send an email to [email protected] >
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