Re: [Lsr] IGP TE Metric Extensions

Muthu Arul Mozhi Perumal <muthu.arul@gmail.com> Tue, 05 June 2018 11:12 UTC

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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Tue, 5 Jun 2018 16:42:03 +0530
Message-ID: <CAKz0y8wnP6PsJPOCTmXOzmHBs5X=2PuXCbgLJ_BWUm3XhNmURw@mail.gmail.com>
To: "Stefano Previdi (IETF)" <s@previdi.net>
Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, lsr@ietf.org
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Subject: Re: [Lsr] IGP TE Metric Extensions
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​Please see inline..​

On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IETF) <s@previdi.net>
wrote:

>
>
> On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perumal <
> muthu.arul@gmail.com> wrote:
>
>> Thanks, Jeff. Would be good to have this clarified in
>> ​​
>> draft-ginsberg-isis-rfc7810bis. My original message seems to have been
>> stripped off, so including it again for the lsr list..
>>
>> ​Both RFC 7810 and RFC 7471 say that:
>>
>>    The measurement interval, any filter coefficients, and any
>>    advertisement intervals MUST be configurable per sub-TLV.
>>
>>    Additionally, the default measurement interval for all sub-TLVs
>>    SHOULD be 30 seconds.
>>
>> However, both RFCs initially say that they only describe mechanisms for
>> disseminating performance information and methods of measurements is
>> outside their scope.
>>
>> Moreover, for a first time reader, it seems to suggest that the
>> measurement interval and filter coefficient must be supported and
>> configurable under the IGP.
>>
>
>
> No. This is not suggested in any form.
> It is clearly indicated that the draft does not deal with measurements
> which means no recommendation is made.
>
>
> In a system supporting multiple IGPs, I would expect that they be
>> implemented outside the IGP and the IGPs just disseminate the information
>> provided to them.
>>
>> Thoughts, especially from an implementation standpoint?
>>
>
>
> Again, the draft is only about dissemination, not measurements.
>

​How is the measurement interval and filter coefficients described in the
draft related to dissemination?​

​   The measurement interval, any filter coefficients, and any
   advertisement intervals MUST be configurable per sub-TLV.

   Additionally, the default measurement interval for all sub-TLVs
   SHOULD be 30 seconds.​


> If your question is related to configuration and implementation of
> measurements, well it will not be addressed by this draft.
>
> We intentionally left out this part that does not belong to the igp
> protocol machinery.
>

​Which of the functionalities described in sections 5, 6, 7 of the draft
belong to the IGP protocol machinery?

Regards,
Muthu


>
> s.
>
>
>
>> Regards.
>> Muthu
>>
>> On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura <jefftant.ietf@gmail.com>
>> wrote:
>>
>>> Muthu,
>>>
>>> LSR would be a more suitable list to post to, CCed.
>>>
>>> Regards,
>>> Jeff
>>>
>>> > On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <
>>> muthu.arul@gmail.com> wrote:
>>> >
>>> > Muthu
>>>
>>
>> _______________________________________________
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>>
>