Re: [mpls] thought about the ADI name

Loa Andersson <> Wed, 22 December 2021 05:46 UTC

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From: Loa Andersson <>
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Date: Wed, 22 Dec 2021 13:46:24 +0800
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To: John E Drake <>
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Subject: Re: [mpls] thought about the ADI name
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A couple of things

- I think we are at the stage when your proposal would benefit from a draft

- you should also closely follow the terminology we have agreed on, data in that are placed in LSEs are called “In Stack Data (ISD)” and data placed after the stack are called ”Post Stack Data (PSD)”. Plz try to align with what we have in the wiki.
- I agree that both actions that rely on ISD and PSD needs to be carefully specified, as well as all the info needed on the ancillary data 

What I did in my mail was discussing a very little piece of the terminology in the requirement specification, the ADIs indicates both action and data. This is not  obvious from the name. 


Sent from my iPhone

> On 20 Dec 2021, at 00:42, John E Drake <> wrote:
> Loa,
> This is an updated version of what I had previously written:
> When defining a network action, it is necessary to define whether that action is hop-by-hop, processed by every transit node on the packet's path from ingress  node to egress node, or end-to-end, processed only by the  egress node, whether that action requires ancillary data and if so, what is that ancillary data and is placed in label stack entries (LSE) or after the BoS (BoS data).  If a given network action is directly related to forwarding and requires ancillary data, that data SHOULD be placed in LSEs.
> I.e., the definition of a given network action itself and whether that network action is specified in a given packet tells a P router what it needs to know wrt that network action's ancillary data. 
> Yours Irrespectively,
> John
> Juniper Business Use Only
>> -----Original Message-----
>> From: mpls <> On Behalf Of Loa Andersson
>> Sent: Sunday, December 19, 2021 11:32 AM
>> To:
>> Subject: [mpls] thought about the ADI name
>> [External Email. Be cautious of content]
>> Working Group,
>> The MIAD Requirement Specification use the abbreviation ADI, it stands for
>> Ancillary Data Indicator. Which is all nice and dandy.
>> But isn't it he case  that the indicator gives us two things, the action to be
>> performed and where to find the data needed, i.e., an Ancillary Data and Action
>> indication (ADAI?).
>> No I'm not suggesting that we change, but we should be aware, and it would be
>> nice to have it mentioned somewhere.
>> /Loa
>> --
>> Loa Andersson                        email:
>> Senior MPLS Expert                
>> Bronze Dragon Consulting             phone: +46 739 81 21 64
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