Re: [Lsr] Request WG adoption of TTZ

[Kiran Makhijani <[e-mail]>]

I support IS-IS TTZ adoption for its value in reducing LSDB through abstraction.
-Kiran

-----Original Message-----
From: Lsr <[e-mail]> On Behalf Of Yanhe Fan
Sent: Sunday, July 12, 2020 7:33 AM
To: Donald Eastlake <[e-mail]>; Huaimo Chen <[e-mail]>
Cc: [e-mail]; [e-mail]
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 <[e-mail]> On Behalf Of Donald Eastlake
Sent: Friday, July 10, 2020 1:08 PM
To: Huaimo Chen <[e-mail]>
Cc: [e-mail]; [e-mail]
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   [phone] (cell)
 2386 Panoramic Circle, Apopka, FL 32703 USA  [e-mail]

On Thu, Jun 18, 2020 at 11:38 PM Huaimo Chen <[e-mail]> 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&amp;data=02%7C01%7Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&amp;sdata=yxhI0GPxnBm5t0hosQNld4qq7O4bu3V2p4RExVjMcqE%3D&amp;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&amp;data=02%7C01%7
> Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C0fee8ff2a
> 3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&amp;sdata=E95AXx%
> 2Bq4Xul3auIUt%2FUI203nvzgDODJDOs8l1Dlk9o%3D&amp;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&amp;data=
> 02%7C01%7Ckiranm%40futurewei.com%7C72917e53d6d94074876208d826709d01%7C
> 0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637301612416445576&amp;sdat
> a=iNunk3YCV%2FiXEEYNYxozwgRlavMPB%2B%2FF1k6K6CCcWkA%3D&amp;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
>
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