[mpls] Re: Fwd: New Version Notification for draft-li-mpls-mna-entropy-03.txt

[Adrian Farrel <[e-mail]>]

How do you measure?
Size : 2^20 bits available in EL and LSE-C
Place in stack : No restriction on either
Repetition in stack : No restriction on either

A
-----Original Message-----
From: Loa Andersson <[e-mail]> 
Sent: 02 September 2024 09:11
To: Stewart Bryant <[e-mail]>; Tony Li <[e-mail]>
Cc: mpls <[e-mail]>
Subject: [mpls] Re: Fwd: New Version Notification for draft-li-mpls-mna-entropy-03.txt

Stewart and Tony,

This might be classified as naive questions :).

Den 02/09/2024 kl. 15:15, skrev Stewart Bryant:
> Hi Tony
>
> I am struggling to see whether this has a sufficient advantage over 
> the existing EL/ELI mechanism to justify us recommending it existence.
>
> It is obvious that this can be done, and it saves an LSE, but is that 
> sufficient justification for the complexity introduced by having two 
> mechanisms that of necessity need to co-exist?
>
> We also need to understand what happens in a legacy routers that are 
> looking for EL/ELI and older routers that just hash the stack. I think 
> they just provide less (no?) entropy.

Is there a scientific way of calculating "how much" entropy the 
different  generate?

Is more entropy always better?

What are the factors that determine how much entropy you need?

/Loa


>
> I imagine this ends with routers needing to parse for both types of 
> entropy which is not a great position to be in.
>
> Best regards
>
> Stewart
>
>> On 30 Aug 2024, at 5:26 PM, Tony Li <[e-mail]> wrote:
>>
>>  [WG chair hat: off]
>>
>> Hi,
>>
>> This update addresses comments from Adrian Farrel as part of the WG 
>> adoption process.
>>
>> Comments and corrections are most welcome.
>>
>> Thanks,
>> Tony
>>
>>
>>> Begin forwarded message:
>>>
>>> *From: *"internet-drafts at ietf.org" <[e-mail]>
>>> *Subject: **New Version Notification for 
>>> draft-li-mpls-mna-entropy-03.txt*
>>> *Date: *August 30, 2024 at 9:24:05 AM PDT
>>> *To: *"John Drake" <[e-mail]>, "Tony Li" <[e-mail]>
>>> *Reply-To: *[e-mail]
>>>
>>> A new version of Internet-Draft draft-li-mpls-mna-entropy-03.txt has 
>>> been
>>> successfully submitted by Tony Li and posted to the
>>> IETF repository.
>>>
>>> Name:     draft-li-mpls-mna-entropy
>>> Revision: 03
>>> Title:    MPLS Network Action for Entropy
>>> Date:     2024-08-28
>>> Group:    Individual Submission
>>> Pages:    5
>>> URL: 
>>>      https://www.ietf.org/archive/id/draft-li-mpls-mna-entropy-03.txt
>>> Status:   https://datatracker.ietf.org/doc/draft-li-mpls-mna-entropy/
>>> HTMLized: 
>>> https://datatracker.ietf.org/doc/html/draft-li-mpls-mna-entropy
>>> Diff: 
>>>     https://author-tools.ietf.org/iddiff?url2=draft-li-mpls-mna-entropy-03
>>>
>>> Abstract:
>>>
>>>   Load balancing is a powerful tool for engineering traffic across a
>>>   network and has been successfully used in MPLS as described in RFC
>>>   6790, "The Use of Entropy Labels in MPLS Forwarding".  With the
>>>   emergence of MPLS Network Actions (MNA), there is signficant benefit
>>>   in being able to invoke the same load balancing capabilities within
>>>   the more general MNA infrastructure.
>>>
>>>   This document describes a network action for entropy to be used in
>>>   conjunction with "MPLS Network Action (MNA) Sub-Stack Solution".
>>>
>>>
>>>
>>> The IETF Secretariat
>>>
>>>
>>
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-- 
Loa Andersson
Senior MPLS Expert
Bronze Dragon Consulting
[e-mail]
[e-mail]

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