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Re: [Isis-wg] ISIS SR Flexible Algorithm (Resending with alias correction)

Tony Przygienda <tonysietf@gmail.com> Mon, 20 November 2017 23:03 UTC

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From: Tony Przygienda <tonysietf@gmail.com>
Date: Mon, 20 Nov 2017 15:02:21 -0800
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
Cc: "Acee Lindem (acee)" <acee@cisco.com>, "isis-wg@ietf.org" <isis-wg@ietf.org>, "draft-hegdeppsenak-isis-sr-flex-algo@ietf.org" <draft-hegdeppsenak-isis-sr-flex-algo@ietf.org>
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Subject: Re: [Isis-wg] ISIS SR Flexible Algorithm (Resending with alias correction)
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understood.

So you compute ALL algorithms in all topologies then? Or just the ones
which have prefix-sid with algorithm attached or something ? Is there a
draft for that yet ?  I only see
https://tools.ietf.org/html/draft-hegdeppsenak-isis-sr-flex-algo-01


--- tony

On Mon, Nov 20, 2017 at 1:40 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.com
> wrote:

> Tony –
>
>
>
> My understanding is that algorithm definitions are topology independent.
> This is consistent with the two algorithms defined today (standard SPF and
> strict-spf).
>
> Using an algorithm in a particular topology would require
> topology/algorithm specific SIDs and the advertisement of topology specific
> link attributes (i.e., in an MT specific IS Neighbor).
>
>
>
>    Les
>
>
>
>
>
> *From:* Isis-wg [mailto:isis-wg-bounces@ietf.org] *On Behalf Of *Tony
> Przygienda
> *Sent:* Monday, November 20, 2017 1:11 PM
> *To:* Acee Lindem (acee) <acee@cisco.com>
> *Cc:* isis-wg@ietf.org; draft-hegdeppsenak-isis-sr-flex-algo@ietf.org
> *Subject:* Re: [Isis-wg] ISIS SR Flexible Algorithm (Resending with alias
> correction)
>
>
>
> So, it seems that there will be a new draft with 242 covering all
> algorithms (i.e. no MT specific algo advertisement anymore).
>
>
>
> Then I thought each MT advertises which Flex it supports. Is the
> assumption that you can run multiple algorithms per MT? How would you
> otherwise have a two-algorithms-to-same-prefix problem?
>
>
>
> Is there some kind of conceptual model of FlexAlgo, i.e. how many of what
> associated with how  many of the other (MT to algo, algo to protocol
> instance etc) ...
>
>
>
> -- tony
>
>
>
> On Mon, Nov 20, 2017 at 10:19 AM, Acee Lindem (acee) <acee@cisco.com>
> wrote:
>
> Hi Shraddha, Peter, et al,
>
>
>
> The comment on the draft I had was that the conflict case where two ISIS
> routers advertise the same multi-homed prefix with a different algorithm
> needs to be covered. I wouldn’t try and optimize for this and would just do
> whatever is simplest but avoids loops (e.g., log the situation and prefer
> the path computed with the lowest numbered algorithm).
>
>
>
> Thanks,
>
> Acee
>
>
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>

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