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Re: [mpls] On the use of GAL in MPLS-SFC OAM

Stewart Bryant <stewart.bryant@gmail.com> Wed, 10 March 2021 17:52 UTC

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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Wed, 10 Mar 2021 17:52:27 +0000
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Cc: Stewart Bryant <stewart.bryant@gmail.com>, Tarek Saad <tsaad=40juniper.net@dmarc.ietf.org>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, Greg Mirsky <gregimirsky@gmail.com>, mpls <mpls@ietf.org>, "draft-lm-mpls-sfc-path-verification@ietf.org" <draft-lm-mpls-sfc-path-verification@ietf.org>, MPLS Working Group <mpls-chairs@ietf.org>
To: huubatwork@gmail.com
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Subject: Re: [mpls] On the use of GAL in MPLS-SFC OAM
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Hi Huub,

> On 10 Mar 2021, at 14:56, Huub van Helvoort <huubatwork@gmail.com> wrote:
> 
> If there is more than one GAL in the stack, then which ACH following
> the BoS belongs to which GAL?


The GAL tells the forwarder  that there is an ACH at BoS. 

My interpretation is that any additional GAL says the same thing, and all of them refer to the same (single) ACH.

We are doing to be discussing this in the PALS Friday meeting, because it is only in the last few months that anyone has suggested that there would be more than one ACH, and we need to understand what the implications of such a change are both in the short term, and for the future of the MPLS protocol.

- Stewart

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