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Re: [mpls] Concerns about ISD

Tianran Zhou <zhoutianran@huawei.com> Thu, 14 April 2022 06:11 UTC

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From: Tianran Zhou <zhoutianran@huawei.com>
To: Robert Raszuk <rraszuk@gmail.com>, Haoyu Song <haoyu.song@futurewei.com>
CC: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] Concerns about ISD
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Date: Thu, 14 Apr 2022 06:10:52 +0000
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Subject: Re: [mpls] Concerns about ISD
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Hi Robert,

I followed your discussions recently in the mailing list. I find your idea is very interesting.
I do not see your solution. But I think it might share the similar idea of our proposal on IOAM marking based direct export.
https://datatracker.ietf.org/doc/draft-song-ippm-postcard-based-telemetry/

If so, it could be very useful.

Best,
Tianran

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Robert Raszuk
Sent: Thursday, April 14, 2022 4:33 AM
To: Haoyu Song <haoyu.song@futurewei.com>
Cc: mpls@ietf.org
Subject: Re: [mpls] Concerns about ISD

Hi Haoyu,

[HS] It’s not about easy or hard to implement, it’s about the tradeoff between performance, cost, flexibility, and extensibility. Unlike the control plane protocols, the design will run in high performance device data plane, so every clock tick counts. In this regard, “Easy” or “Hard” can be and should be evaluated based on a set of solid qualitative and quantitative criteria when we compare different schemes.  We should choose the best design to the best of our knowledge.

I believe this is very well said indeed.

What is apparently being worked on here for months is in my view merely a CPR for MPLS.

Instead IMO (and that is why I brought up the control plane assisted model) MPLS could way exceed capabilities of SR NP without any excessive load on packets or major surgery to MPLS architecture by encoding reference to forwarding behaviour itself instead of just a pile atomic "actions" (irrespective if those are stuffed into ISD or PSD).

So yes - no draft no proposal - I get this. I will write one. When I get to it.

Kind regards,
Robert.

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