+1 I think Henk has spoken eloquently here - as have others before him.
Abstracting an area may be useful - the WG has yet to fully decide on that. But nothing so far has demonstrated that we need to go even further and abstract a subset of an area. Les > -----Original Message----- > From: Lsr <[email protected]> On Behalf Of John E Drake > Sent: Wednesday, July 15, 2020 7:19 AM > To: Henk Smit <[email protected]>; Huaimo Chen > <[email protected]> > Cc: [email protected] > Subject: Re: [Lsr] Request WG adoption of TTZ > > I agree w/ Henk. The TTZ seems to be a gratuitous addition. > > Yours Irrespectively, > > John > > > Juniper Business Use Only > > > -----Original Message----- > > From: Lsr <[email protected]> On Behalf Of Henk Smit > > Sent: Wednesday, July 15, 2020 8:22 AM > > To: Huaimo Chen <[email protected]> > > Cc: [email protected] > > Subject: Re: [Lsr] Request WG adoption of TTZ > > > > [External Email. Be cautious of content] > > > > > > Huaimo Chen wrote on 2020-07-14 06:09: > > > > > 2). IS-IS TTZ abstracts a zone to a single node. A zone is any target > > > block or piece of an IS-IS area, which is to be abstracted. This seems > > > more flexible and convenient to users. > > > > I don't agree that this convenience is really beneficial. > > I actually think this convenience is a downside. > > > > > > Link-state protocols are not easy to understand. And we already have the > > misfortune that IS-IS and OSPF use different names for things. > > Adding the new concept of a "zone", while we already have the concept of > an > > area makes things only more complex. > > > > How often will this new flexibility be used in the real world ? > > I still haven't seen an answer to Christian Hopp's simple question: > > "Has RFC8099 been deployed by anyone ?" > > Anyone who has an answer ? > > > > My favorite rule of RFC1925 is rule 12: > > In protocol design, perfection has been reached not when there is > > nothing left to add, but when there is nothing left to take away. > > > > Adding a new concept, with very little benefit, hurts the protocol in the > long run. > > The ability to abstract an area, and not also a zone, is strong enough to be > > worthwhile, imho. > > > > henk. > > > > _______________________________________________ > > Lsr mailing list > > [email protected] > > > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;! > !NEt > > 6yMaO- > > > gk!Qd22Qan7jubM_Vup5P5G6gsGg_horPl4PSDx8qS_v03ZIb8sNalgwEsGJ7Q6 > 1cc > > $ > > _______________________________________________ > Lsr mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/lsr _______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr
