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

Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Fri, 10 May 2019 09:19 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "olivier.dugeon@orange.com" <olivier.dugeon@orange.com>, SPRING <spring@ietf.org>, LSR <lsr@ietf.org>, Christian Franke <chris@opensourcerouting.org>
Thread-Topic: [spring] [Lsr] Adjacency SID and Passive Interface
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Date: Fri, 10 May 2019 09:18:54 +0000
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References: <13318_1557475082_5CD52F0A_13318_76_1_e581409b-8272-9b7b-df11-941f4325413d@orange.com>, <e78e6735-059c-a563-d657-244696b904ff@opensourcerouting.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/IS-UXpM_8CRqqcjcJs0Sc2HZL3U>
Subject: Re: [spring] [Lsr] Adjacency SID and Passive Interface
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Hi all,
The life span of an unprotected Adj-SID matches the life span of the corresponding IGP adjacency. This means that there can be no Adj-SIDs on passive IGP interfaces because no IGP adjacencies are formed across thesd interfaces.

Inter-AS interfaces can be associated with BGP Peer Segment IDs as described in  the BGP Egress Peer Engineering (EPE) draft.

Hopefully this helps.

Thumb typed by Sasha Vainshtein

________________________________
From: spring <spring-bounces@ietf.org> on behalf of Christian Franke <chris@opensourcerouting.org>
Sent: Friday, May 10, 2019 11:40:11 AM
To: olivier.dugeon@orange.com; SPRING; LSR
Subject: Re: [spring] [Lsr] Adjacency SID and Passive Interface

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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