I support IS-IS TTZ adoption for its value in reducing LSDB through abstraction. -Kiran
-----Original Message----- From: Lsr <lsr-boun...@ietf.org> On Behalf Of Yanhe Fan Sent: Sunday, July 12, 2020 7:33 AM To: Donald Eastlake <d3e...@gmail.com>; Huaimo Chen <huaimo.c...@futurewei.com> Cc: lsr@ietf.org; lsr-cha...@ietf.org Subject: Re: [Lsr] Request WG adoption of TTZ I support adaption of this IS-IS TTZ draft. It is a useful work to address network scalability. Thanks, Yanhe -----Original Message----- From: Lsr <lsr-boun...@ietf.org> On Behalf Of Donald Eastlake Sent: Friday, July 10, 2020 1:08 PM To: Huaimo Chen <huaimo.c...@futurewei.com> Cc: lsr@ietf.org; lsr-cha...@ietf.org Subject: Re: [Lsr] Request WG adoption of TTZ I support adoption of the IS-IS TTZ draft. It seems more flexible and capable although some editorial/nomenclature improvements in the draft would be good. I will send some more detailed suggestions to the authors. Thanks, Donald =============================== Donald E. Eastlake 3rd +1-508-333-2270 (cell) 2386 Panoramic Circle, Apopka, FL 32703 USA d3e...@gmail.com On Thu, Jun 18, 2020 at 11:38 PM Huaimo Chen <huaimo.c...@futurewei.com> wrote: > > Hi Chris and Acee, and everyone, > > > > I would like to request working group adoption of "Topology-Transparent > Zone" > > (TTZ for short) > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-chen-isis-ttz%2F&data=02%7C01%7Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&sdata=yxhI0GPxnBm5t0hosQNld4qq7O4bu3V2p4RExVjMcqE%3D&reserved=0 > . > > > This draft comprises the following solutions for helping to improve > scalability: > > 1) abstracting a zone to a single pseudo node in IS-IS, > > 2) abstracting a zone to a single pseudo node in OSPF, > > 3) abstracting a zone to zone edges' full mess in IS-IS, and > > 4) transferring smoothly between a zone and a single pseudo node. > > A zone is a block of an area (IS-IS L2 or L1 area, OSPF backbone > or > > non-backbone area). > > > > When a network area becomes (too) big, we can reduce its size in > the sense > > of its LSDB size through abstracting a zone to a single pseudo node or > > abstracting a few zones to a few pseudo nodes. > > > > While a zone is being abstracted (or transferred) to a single > pseudo node, > > the network is stable. There is no or minimum service interruption. > > > > After abstracting a few zones to a few pseudo nodes, if we want to > reconstruct > > them, we can transfer (or roll) any of the pseudo nodes back to its > zone smoothly > > with no or minimum service interruption. > > > > We had a prototype implementation of abstracting a zone to zone > edges' full > > mess in OSPF. The procedures and related protocol extensions for > transferring > > smoothly from a zone to zone edges' full mess are implemented and tested. > > A zone (block of an OSPF area) is smoothly transferred to its edges’ > full mess > > without any routing disruptions. The routes on every router are stable > while > > the zone is being transferred to its edges' mess. It is very easy to > operate > > the transferring. > > > > There are two other drafts for improving scalability: "Area Proxy for > IS-IS" > > (Area Proxy for short) and "IS-IS Flood Reflection" (Flood Reflection for > short). > > > > "Area Proxy" > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftool > s.ietf.org%2Fhtml%2Fdraft-li-lsr-isis-area-proxy-03&data=02%7C01%7 > Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C0fee8ff2a > 3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&sdata=E95AXx% > 2Bq4Xul3auIUt%2FUI203nvzgDODJDOs8l1Dlk9o%3D&reserved=0 > > abstracts an existing IS-IS L1 area to a single pseudo node. > > > > "Flood Reflection" > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftool > s.ietf.org%2Fhtml%2Fdraft-przygienda-lsr-flood-reflection-01&data= > 02%7C01%7Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C > 0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&sdat > a=iNunk3YCV%2FiXEEYNYxozwgRlavMPB%2B%2FF1k6K6CCcWkA%3D&reserved=0 > > abstracts an existing IS-IS L1 area to its edges' connections via one > or more > > flood reflectors. > > > > We believe that TTZ has some special advantages even though > > Area Proxy and Flood Reflection are very worthy. We would like > > to ask for working group adoption of TTZ. > > > > Best Regards, > > Huaimo > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww. > ietf.org%2Fmailman%2Flistinfo%2Flsr&data=02%7C01%7Ckiranm%40future > wei.com%7C72917e53d6d94074876208d826709d01%7C0fee8ff2a3b240189c753a1d5 > 591fedc%7C1%7C0%7C637301612416445576&sdata=P9I3KSsJb84wDSs6kaVrI%2 > B5bfPRF2MNt1JyTvJea6wc%3D&reserved=0 _______________________________________________ Lsr mailing list Lsr@ietf.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Flsr&data=02%7C01%7Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&sdata=P9I3KSsJb84wDSs6kaVrI%2B5bfPRF2MNt1JyTvJea6wc%3D&reserved=0 _______________________________________________ Lsr mailing list Lsr@ietf.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Flsr&data=02%7C01%7Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&sdata=P9I3KSsJb84wDSs6kaVrI%2B5bfPRF2MNt1JyTvJea6wc%3D&reserved=0 _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr
