Re: [Lsr] IGP TE Metric Extensions

"Stefano Previdi (IETF)" <s@previdi.net> Thu, 31 May 2018 21:04 UTC

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From: "Stefano Previdi (IETF)" <s@previdi.net>
Date: Thu, 31 May 2018 23:04:05 +0200
Message-ID: <CAJp-iyW2RRQOTfpdh4xLLqUK_xPwqLdDU7ijBPmDSXLn=HVBMQ@mail.gmail.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
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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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. 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.

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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