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Re: [Idr] Does SRGB TLV in draft-ietf-idr-bgp-prefix-sid qualify for BGP Attibute discard?

Eric C Rosen <erosen@juniper.net> Tue, 26 June 2018 19:39 UTC

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To: Susan Hares <shares@ndzh.com>, "'Ketan Talaulikar (ketant)'" <ketant@cisco.com>, 'Robert Raszuk' <robert@raszuk.net>
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From: Eric C Rosen <erosen@juniper.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/3bwP4DsCZs6CO6k28FfqyD0Dy9s>
Subject: Re: [Idr] Does SRGB TLV in draft-ietf-idr-bgp-prefix-sid qualify for BGP Attibute discard?
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On 6/26/2018 3:17 PM, Susan Hares wrote:
> AFAIK, the normative references do not provide adequate information on 
> the manageability and expectations on the timing for the BGP Peer 
> segments.

I think the normative references  make it clear that SIDs and SRGBs are 
not dynamically changing values.

> Most BGP attributes have some effect on routing, the question is 
> whether discarding a malformed attribute will result in inconsistent 
> routing (loops).

> [Sue] Yes – this is the question I am trying to discuss.  I’ve 
> provided scenarios where it might fail.

If you can provide a clear description of a scenario that results in 
inconsistent routing, that would be interesting.  However, I don't think 
you've described such a scenario yet (or I missed it somehow).

The real danger with all this traffic engineering stuff is not that an 
UPDATE might be malformed, but that it might be properly formed but have 
incorrect values.  But that's the nature of traffic engineering.

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