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Re: [spring] [Lsr] Adjacency SID and Passive Interface

Christian Franke <chris@opensourcerouting.org> Fri, 10 May 2019 08:40 UTC

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To: olivier.dugeon@orange.com, SPRING <spring@ietf.org>, LSR <lsr@ietf.org>
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From: Christian Franke <chris@opensourcerouting.org>
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Date: Fri, 10 May 2019 10:40:11 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/RF8_v6fwYUKNn3dmT-6Q0IuktVQ>
Subject: Re: [spring] [Lsr] Adjacency SID and Passive Interface
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On 5/10/19 9:58 AM, olivier.dugeon@orange.com wrote:
> In the current state of Segment Routing drafts, do you think it is possible to advertise
> Adjacency SID on such passive or inter-domain interfaces or do we need to specify this behaviour
> in a new draft ?
> 
> For me I don't see anything in the drafts that prohibits this kind of advertisement, but perhaps I'm wrong.

My understanding is that the SID is specific to an adjacency and
advertised in IS-IS in either TLV 22, 222, 23, 223.

As adjacencies will not be formed on a passive interface, an adjacency
SID should not be advertised for the passive interface.

I might also be wrong here, though.

All Best,
Chris

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