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Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS

Loa Andersson <loa@pi.nu> Thu, 17 June 2021 14:53 UTC

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To: John E Drake <jdrake=40juniper.net@dmarc.ietf.org>, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, Stewart Bryant <stewart.bryant@gmail.com>
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From: Loa Andersson <loa@pi.nu>
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Date: Thu, 17 Jun 2021 16:53:35 +0200
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Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS
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DT,

Quick comments on John's mail:

On 17/06/2021 16:44, John E Drake wrote:
> *//*
> 
> */[JD] As we start to add all sorts of nifty functions both within the 
> stack and after it, we need to add these functions in such a way that a 
> transit LSR that does not understand one or more of them still will be 
> able to forward a packet containing them.  

Yes, we must have an architecture that supports that.

> For example, if we were to 
> add ancillary data in the label stack, it needs to be done in such a way 
> as to allow a transit router to skip over the ancillary data that it 
> doesn’t understand./*

Ancillary "data in the stack"?  Does not all ancillary data go after the 
BoS?

/Loa
> 
> *//*
> 
> */I.e., incremental deployment is a fact of life and we have to live 
> with it./*
> 

-- 

Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert                          loa.pi.nu@gmail.com
Bronze Dragon Consulting             phone: +46 739 81 21 64

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