Hi Tony,
Assume that a big L1 area (say Area A1) is connected to backbone domain.
Let us compare TTZ and Areas for scalability.
Using TTZ, we need two steps below:
1) configure a piece of Area A1, named P1, as a zone; and
2) transfer P1 to a virtual node using one command or two.
Using Areas, we need four steps below to split Area A1 into two L1 areas
A11 and A12:
1) configure the edges between A11 and A12 as L2/L1 to backbone domain;
2) add/configure a new area address on the routers in target Area A12;
3) configure Attach bit for A11 or A12; and
4) delete the old area address from the routers in Area A12.
Using TTZ is simpler than using Areas.
Best Regards,
Huaimo
________________________________
From: Tony Li <tony1ath...@gmail.com> on behalf of tony...@tony.li
<tony...@tony.li>
Sent: Tuesday, September 1, 2020 11:01 AM
To: Huaimo Chen <huaimo.c...@futurewei.com>
Cc: Les Ginsberg <ginsb...@cisco.com>; Les Ginsberg (ginsberg)
<ginsberg=40cisco....@dmarc.ietf.org>; Acee Lindem (acee)
<acee=40cisco....@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] LSR WG Adoption Poll for "IS-IS Topology-Transparent Zone" -
draft-chen-isis-ttz-11.txt
Hi Huaimo,
> The question I and others have asked is “what can we do with zones that
> cannot be done with areas?”.
[HC]: IS-IS TTZ or say Zone is one of a few drafts which experiment/explore
new ways for scalability. These new ways may be simpler and have some other
features.
The English language is a remarkable creature. Enormously complex and
intricate. Maddeningly irregular and inconsistent.
The word “may” is a fine example. It denotes the possibility of a relationship
between two concepts, but says nothing about the likelihood of the reality. As
a result, it can be used to
conjoin arbitrary entities.
Trump MAY win the election.
COVID MAY cure cancer.
The world MAY end tomorrow.
Any sentence with the word MAY in it is equally true if you replace “MAY” with
“MAY NOT”.
Zones MAY be simpler. Zones MAY NOT be simpler. It’s up to you to convince us
that they are simpler, better, or provide some value above and beyond the
concepts that we have now.
The obligation is on you to make this point.
So far, you haven’t.
Regards,
Tony
_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
