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Re: [mpls] [spring] Special purpose labels in draft-hegde-spring-traffic-accounting-for-sr-paths

"Zafar Ali (zali)" <zali@cisco.com> Sat, 18 November 2017 06:12 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: John E Drake <jdrake@juniper.net>
CC: draft-hegde-spring-traffic-accounting-for-sr-paths <draft-hegde-spring-traffic-accounting-for-sr-paths@ietf.org>, spring <spring@ietf.org>, mpls <mpls@ietf.org>
Thread-Topic: [mpls] [spring] Special purpose labels in draft-hegde-spring-traffic-accounting-for-sr-paths
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Date: Sat, 18 Nov 2017 06:12:29 +0000
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Subject: Re: [mpls] [spring] Special purpose labels in draft-hegde-spring-traffic-accounting-for-sr-paths
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Hi John,

Sorry for delay in the response; I was away from the emails. Please see in-line.

Thanks

Regards … Zafar

<snip>
 <snip> procedure (in draft-hegde-spring-traffic-accounting-for-sr-paths) that breaks SR Architecture, highly unscalable and complicated to implement.

[JD]  Do you have any evidence to justify any of your assertions, above?

Please note that in draft-hegde-spring-traffic-accounting-for-sr-paths:

•    The transit node needs to be able to recognize the special label, read the SR Path Identification label and update the counter against such “states”.
•    The draft proposes to push (up to) 3 Labels for each segment in the SR Path. That means that label stack is increased up to 3x times! This is a serious a scaling issue.
•    The controller needs to keep track of transit node capability and push the additional per-path labels, accordingly. I.e., the controller also needs to maintain such information for the transit nodes.


<snip>

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