Re: [Lsr] Working Group Last Call for "OSPF Link Traffic Engineering (TE) Attribute Reuse" - draft-ietf-ospf-te-link-attr-reuse-07.txt

<olivier.dugeon@orange.com> Fri, 12 April 2019 14:27 UTC

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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
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From: olivier.dugeon@orange.com
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Date: Fri, 12 Apr 2019 16:27:57 +0200
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Subject: Re: [Lsr] Working Group Last Call for "OSPF Link Traffic Engineering (TE) Attribute Reuse" - draft-ietf-ospf-te-link-attr-reuse-07.txt
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Hi Les,


Le 12/04/2019 à 15:31, Les Ginsberg (ginsberg) a écrit :
> +1 to what Peter has stated.
>
> Olivier -
>
> We are aware that link attribute management/application has challenges - which is why we are careful to allow sharing of attributes when appropriate.
> But to state that there is no problem and that things can be addressed with existing IGP functionality if one is "careful" contradicts our existing deployment experience - as Peter has clearly stated.
Unfortunately, it is not clear for me which problem your encountered. Can you explain in detail ?

Regards

Olivier
>
>    Les
>
>
>> -----Original Message-----
>> From: Peter Psenak <ppsenak@cisco.com>
>> Sent: Friday, April 12, 2019 6:27 AM
>> To: olivier.dugeon@orange.com; Acee Lindem (acee) <acee@cisco.com>;
>> lsr@ietf.org
>> Cc: draft-ietf-ospf-te-link-attr-reuse@ietf.org
>> Subject: Re: [Lsr] Working Group Last Call for "OSPF Link Traffic Engineering
>> (TE) Attribute Reuse" - draft-ietf-ospf-te-link-attr-reuse-07.txt
>>
>> Hi Oliver,
>>
>> There are two major purposes served by the drafts:
>>
>> 1)Support of incongruent topologies for different applications
>>
>> 2)Advertisement of application specific values even on links that are in
>> use by multiple applications
>>
>> These issues are clearly articulated in the Introductions of both
>> drafts. LSR WG acknowledged them a while back and decided to address
>> them.
>>
>> Issue #1 has already had a significant impact on early deployments of
>> SRTE in networks where there is partial deployment of SR in the presence
>> of RSVP-TE.
>>
>> Issue #2 will be seen in deployments where Flex-Algo and SRTE (or
>> RSVP-TE) are also present. Early implementers of Flex-Algo can attest to
>> this.
>>
>> It is simply not possible to address these issues with the existing
>> single set of application independent advertisements.
>>
>> The solutions we provide in both drafts allow to share the link
>> attributes between application as well as keep them separate if that is
>> what is required.
>>
>> thanks,
>> Peter
>>
>> On 11/04/2019 19:43 , olivier.dugeon@orange.com wrote:
>>> Hi,
>>>
>>> I'm not in favour of this draft.
>>>
>>> As already mention, I don't see the interest to duplicate TE attributes
>>> in new Extended Link Opaque LSA. For me, it is only a matter of
>>> implementation to look at various place in the OSPF TE Database to take
>>> Traffic Engineering information.
>>>
>>> From an operator perspective, it is already hard to manage TE attribute
>>> and I'm pretty sure that we could not ask network management team to
>>> maintain 2 systems for certainly a long period of time as many TE
>>> attributes remains in the standard Opaque LSA Traffic Engineering.
>>>
>>> Regards
>>>
>>> Olivier
>>>
>>>
>>> Le 11/04/2019 à 18:11, Acee Lindem (acee) a écrit :
>>>>  LSR Working Group,
>>>>
>>>>
>>>>
>>>> This begins a two week  WG last call for the subject document. Please
>>>> enter your support or objection to the document before 12:00 AM (EDT)
>>>> on Friday, April 27^th , 2019.
>>>>
>>>>
>>>>
>>>> Thanks,
>>>> Acee
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Lsr mailing list
>>>> Lsr@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>
>> __________________________________________________________
>> __________________________________________________________
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_________________________________________________________________________________________________________________________

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