Re: [Idr] 2 week WG LC for draft-ietf-custom-decision (4/20 to 5/4/2015)

[<[e-mail]>]

Hi Robert,

Please see inline [Bruno]

From: [e-mail] [mailto:[e-mail]] On Behalf Of Robert Raszuk
Sent: Monday, February 06, 2017 4:20 PM
To: DECRAENE Bruno IMT/OLN
Cc: Alvaro Retana (aretana); [e-mail]; Susan Hares
Subject: Re: [Idr] 2 week WG LC for draft-ietf-custom-decision (4/20 to 5/4/2015)

Hi Bruno,

On my side, I’d propose
OLD: the propagation of Cost Communities MUST be disabled by default
NEW: the use of Cost Communities MUST be disabled by default

​Do you really think it is safe to propagate ​information which can completely overwrite Best Path without applying it locally ?

[Bruno]
1) IIRC, this is exactly what this document does, for all BGP speakers which do not support the cost-community.
2) I’ve said that both choices can lead to forwarding loops. Where do you see that I said it was safe?


If we are really to change this text how about this:

NEW: The use of Cost Communities MUST be disabled by default. The propagation may occur by default only on those BGP speakers which do not set next hop self.
[Bruno] I’m fine with the first sentence.
The second sentence introduces a behavior which is per route (rather than per node currently). I don’t really see a strong enough reason for this additional complexity. Especially given that all non-compliant router will propagate it in all cases.

Cheers,
Bruno


​Cheers,
R.
​


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