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Re: [spring] draft-ietf-spring-srv6-network-programming: Relative advantages of SRv6

Ron Bonica <rbonica@juniper.net> Mon, 30 December 2019 12:19 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: SPRING WG <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Relative advantages of SRv6
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Date: Mon, 30 Dec 2019 12:19:01 +0000
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Relative advantages of SRv6
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Robert,

We should probably let the authors decide if that is part of the answer to my question.

                                                                             Ron

From: Robert Raszuk <robert@raszuk.net>
Sent: Monday, December 30, 2019 6:16 AM
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Relative advantages of SRv6

Hi Ron,

How about instead of jumping into the middle of SR piece first focus on more fundamental comparison of IP transport vs MPLS transport in a network ?

Do you still believe that the concept of domain wide flooding of host routes and labels attached to it - be it /32 or /128 prefixes is a wise thing ?

For years MPLS world struggled with it .... and it still hurts in many ways today.

Instead of nicely summarized areas or regions where you advertise single IGP summary out, when your SPF is very small (and its timers can be very aggressive) you are flooding within or across continents all of the hosts routes from 1000s of routers slowing the entire network down. That's just sick network architecture to me. And the only reason for doing it ... Your transport label is not summarizable !

For other hints pls take a look at RFC 4023 & RFC 7510 :).

Do you really see any value to copy text from those drafts into subject document ? I do not.

Cheers,
R.

PS. Once we first agree on the proper network transport - only then there is time to focus on service level discussions.


On Mon, Dec 30, 2019 at 11:07 AM Ron Bonica <rbonica=40juniper..net@dmarc.ietf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Pablo,

Would you consider adding a short section to the draft explaining the relative advantages of SRv6 over SR-MPLS? This section would explain why an network operator would deploy SRv6 instead of SR-MPLS.

                                                                                         Ron



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