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Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators

"Zafar Ali (zali)" <zali@cisco.com> Thu, 09 June 2022 04:53 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, 'Loa Andersson' <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, 'DetNet Chairs' <detnet-chairs@ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators
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Date: Thu, 09 Jun 2022 04:53:40 +0000
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Subject: Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators
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Hi Adrian, WG

Please see [ZA] in-line 

Thanks
 
Regards … Zafar 

On 6/8/22, 5:34 PM, "mpls on behalf of Adrian Farrel" <mpls-bounces@ietf.org on behalf of adrian@olddog.co.uk> wrote:

<snip> 

    > (2) re-purposing the ELI SPL?

    No way! 😊

    Bruno and Zafar cast this as "extending" the ELI. In other words, in their view, this approach is backwards compatible with existing ELI deployments. This may be technically possible, but I still don't like it because I don't think it is a clean separation of functions.

[ZA] The RFC is very clear that TTL must be zero when sent and ignored when received. So the backward compatibility is indeed practical and brings a huge value by enabling incremental deployments; benefit of not increasing the stack size. Such benefits IMO should not be ignored. In fact, I am aware of implementation of Bruno's draft where backward compatibility has been validated. 

<snip>

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