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Re: [Lsr] LSR WG Adoption Poll for "IS-IS Topology-Transparent Zone" - draft-chen-isis-ttz-11.txt

Robert Raszuk <robert@raszuk.net> Thu, 03 September 2020 08:43 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 03 Sep 2020 10:43:43 +0200
Message-ID: <CAOj+MMFKk0uwFnExpNVkj=i08dDMNV67iGHO1nCQuvf4cohd=Q@mail.gmail.com>
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: "tony.li@tony.li" <tony.li@tony.li>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Les Ginsberg <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>
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Subject: Re: [Lsr] LSR WG Adoption Poll for "IS-IS Topology-Transparent Zone" - draft-chen-isis-ttz-11.txt
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Hi Huaimo,


> > Users can define a zone (a block of an area) and the zone can be any
> block of the area that users decide. Thus, using TTZ seems simpler than
> using Areas for scalability. It uses less planning effort and less
> configurations.
>
>
Q1 - Can zones overlap ? IE. can any node be in the same time in
multiple zones ?

Q2 - Can zones be nested ?

Q3 - Can zone boundary span across two or more areas ?

> [HC]:  The requirement for flooding of host routes domain wide is
considered in section 4.1.3 of TTZ draft.

Well all it says that loopbacks can be included. That in no way addresses
the scalability aspect if those loopbacks are to be flooded domain wide
anyway.

Thx,
R.

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