Re: [OSPF] OSPF Topology Transparent Zone (TTZ) Next Steps

Huaimo,

OSPF has the concept of areas, which allows you to scale if needed. ABR 
part is also the most complex part of the OSPF protocol and TTZ is of 
the same if not higher complexity.

I do not believe current area architecture has reached its scaling 
limits which would require an introduction of the new protocol mechanism.

In short, you need to find some other applicability of the TTZ, scaling 
is simply not the relevant one.

my 2c,
Peter

On 9.7.2013 21:33, Huaimo Chen wrote:
> Hi Hannes,
>
>      Thanks for your comments!
>      See my responses in line below.
>
> Best Regards,
> Huaimo
> -----Original Message-----
> From: ospf-bounces@ietf.org [mailto:ospf-bounces@ietf.org] On Behalf Of Hannes Gredler
> Sent: Tuesday, July 09, 2013 1:21 PM
> To: Acee Lindem
> Cc: OSPF List
> Subject: Re: [OSPF] OSPF Topology Transparent Zone (TTZ) Next Steps
>
> scaling a link-state protocols route-calculation path (SPF and RIB-Walk) to support 1000s of nodes is an already solved problem.
> solving it again, (just different this time) is of limited use ...
>
> [Huaimo] How about 10,000s or 100,000s of nodes?
>
>
> quite contrary - i fail to see how *hiding* information (i.e. nodes and links along with their TE attributes) does not break some of the TE eco-system that has been built around link-state IGPs. i am particularly interested how  TE use-cases requiring admission-control and pre-emption play with TTZ.
>
> [Huaimo] Regarding to TE, we are working on it and have some solutions.
>
>
> /hannes
>
> On Jul 6, 2013, at 9:09 PM, Acee Lindem wrote:
>
>> As WG chair, I'd like to initiate a discussion on this technology. We've had it presented at the last couple IETFs and there are varying opinions on its usefulness.
>> For reference:
>>
>>   Base Document: http://www.ietf.org/id/draft-chen-ospf-ttz-05.txt
>>   Applicability: http://www.ietf.org/id/draft-chen-ospf-ttz-app-03.txt
>
>
>
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