Re: [Lsr] New draft on Flex-Algorithm Bandwidth Constraints

Peter Psenak <ppsenak@cisco.com> Wed, 03 March 2021 10:22 UTC

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To: Robert Raszuk <robert@raszuk.net>
Cc: Tony Li <tony.li@tony.li>, Gyan Mishra <hayabusagsm@gmail.com>, DECRAENE Bruno IMT/OLN <bruno.decraene@orange.com>, Shraddha Hegde <shraddha@juniper.net>, Rajesh M <mrajesh@juniper.net>, "lsr@ietf.org" <lsr@ietf.org>, William Britto A J <bwilliam=40juniper.net@dmarc.ietf.org>
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From: Peter Psenak <ppsenak@cisco.com>
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Date: Wed, 3 Mar 2021 11:22:01 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/uBqRdM9Q7TP67weI8ZyhHqNkMHE>
Subject: Re: [Lsr] New draft on Flex-Algorithm Bandwidth Constraints
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Robert,

On 03/03/2021 11:10, Robert Raszuk wrote:
> Hey Peter,
> 
>      > Authors stated: "Whether egress queueing delay is included in the
>     link
>      > delay depends on the measuring mechanism."
> 
>     I disagree with that statement - the Min Unidirectional Link Delay is
>     the value that does not include the queueing delay - that's why it is
>     called Min.
> 
> 
> 
> But draft we are discussing here does not talk about "Min" delay. 
> Contrary it talks about "Max"
> 
> *Maximum*  Delay sub-TLV
> 
> That is also I asked that very question up front.

I'm afraid you misunderstood it. FA uses "Min Unidirectional Link Delay" 
as one of its metrics. The "Maximum Delay sub-TLV"  is used to advertise 
the maximum value of the "Min Unidirectional Link Delay" that is allowed 
for the particular FA.

The text should be improved in that regard though, it's not obvious, but 
I believe that's what it is.

thanks,
Peter

> 
> Thx,
> R.
> 
> 
> 
>