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

John E Drake <jdrake@juniper.net> Thu, 17 June 2021 14:55 UTC

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From: John E Drake <jdrake@juniper.net>
To: Loa Andersson <loa@pi.nu>, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, Stewart Bryant <stewart.bryant@gmail.com>
CC: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS
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Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS
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Loa,

I thought the FAI proposal put ancillary data in the stack.

Yours Irrespectively,

John


Juniper Business Use Only

> -----Original Message-----
> From: Loa Andersson <loa@pi.nu>
> Sent: Thursday, June 17, 2021 10:54 AM
> To: John E Drake <jdrake@juniper.net>; Alexander Vainshtein
> <Alexander.Vainshtein@rbbn.com>; Stewart Bryant
> <stewart.bryant@gmail.com>
> Cc: mpls@ietf.org
> Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after
> the BoS
> 
> [External Email. Be cautious of content]
> 
> 
> 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