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

Huaimo Chen <huaimo.chen@huawei.com> Tue, 09 July 2013 19:33 UTC

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From: Huaimo Chen <huaimo.chen@huawei.com>
To: Hannes Gredler <hannes@juniper.net>, Acee Lindem <acee.lindem@ericsson.com>
Thread-Topic: [OSPF] OSPF Topology Transparent Zone (TTZ) Next Steps
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Date: Tue, 9 Jul 2013 19:33:37 +0000
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Cc: OSPF List <ospf@ietf.org>
Subject: Re: [OSPF] OSPF Topology Transparent Zone (TTZ) Next Steps
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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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