RE: Alvaro Retana's Discuss on draft-ietf-rtgwg-backoff-algo-07: (with DISCUSS and COMMENT)

[<[e-mail]>]

Alvaro,



Thanks.

-10 has just been uploaded.



2 changes, applying text we discussed in email:

- default timers values are added

- slightly reworded definition of “Routing table computation”



Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-backoff-algo
Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-backoff-algo-10

Thanks for your review
--Bruno

From: Alvaro Retana [mailto:[e-mail]]
Sent: Sunday, March 18, 2018 2:56 PM
To: DECRAENE Bruno IMT/OLN
Cc: [e-mail]; [e-mail]; The IESG; [e-mail]; Uma Chunduri
Subject: RE: Alvaro Retana's Discuss on draft-ietf-rtgwg-backoff-algo-07: (with DISCUSS and COMMENT)

On February 27, 2018 at 10:43:42 AM, [e-mail]<mailto:[e-mail]> ([e-mail]<mailto:[e-mail]>) wrote:

Bruno:

Hi!

You and I have a significant difference in opinion related to what can be expected of a typical network operator.  In short, I don’t think that we can expect the same from that typical operator as we can from someone like you.  [To avoid confusion: this is a compliment! :-) ]

I will reply on the Responsible AD for any changes that may be needed from my comments.

I will clear my DISCUSS if the text you proposed below is included in the draft.

Thanks!

Alvaro.

...
> Back to the point of this DISCUSS, the importance of consistent values is
> clear! Based on the experience of existing implementations, please specify
> "safe" default values.

[Bruno] Ok.
First of all, I do think that the "best" default are likely to change over time (as both CPU power and customer requirements increase). Over the last 15+ years, this has already happened on some implementations https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/211432-Change-of-Default-OSPF-and-IS-IS-SPF-and.html Also for the BGP protocol, this also happened for BGP Route Flap dampening parameters (cf RFC 2439 & 7196). They are also likely to be dependent of the segment market (e.g. backbone vs backhaul vs "pre-aggregation").

I would propose the following addition:
NEW:
If this SPF backoff algorithm is enabled by default, then in order to have consistent SPF delays between implementations with default configuration, the following default values SHOULD be implemented:
INITIAL_SPF_DELAY 50 ms, SHORT_SPF_DELAY 200ms, LONG_SPF_DELAY: 5 000ms, TIME_TO_LEARN_INTERVAL 500ms, HOLDDOWN_INTERVAL 10 000ms.


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