Re: [Idr] Martin Duke's No Objection on draft-ietf-idr-bgp-ls-segment-routing-msd-16: (with COMMENT)
Alvaro Retana <aretana.ietf@gmail.com> Fri, 24 April 2020 18:55 UTC
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From: Alvaro Retana <aretana.ietf@gmail.com>
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Date: Fri, 24 Apr 2020 11:55:01 -0700
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To: Martin Duke via Datatracker <noreply@ietf.org>, The IESG <iesg@ietf.org>,
Martin Duke <martin.h.duke@gmail.com>
Cc: Susan Hares <shares@ndzh.com>, idr-chairs@ietf.org,
draft-ietf-idr-bgp-ls-segment-routing-msd@ietf.org, idr@ietf.org
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Subject: Re: [Idr] Martin Duke's No Objection on
draft-ietf-idr-bgp-ls-segment-routing-msd-16: (with COMMENT)
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On April 24, 2020 at 12:54:53 PM, Martin Duke wrote: Martin: Hi! > This is not a DISCUSS-level concern, but I found it odd that the Node MSD TLV > must be the minimum of all configured interfaces without regard for the > presence of any Link MSD TLVs. > > For example, if all node interfaces have an MSD of 20 except one with an MSD > of 10, it would be much more compact to advertise a Node MSD of 20 and a > single Link MSD of 10. Section 5 says the Link MSD would take precedence, so > there would be no information loss. As I understand the spec, this would not > be allowed, and each link would have to be advertised separately to gain that > level of granularity. > > If this is not the intent, then in Section 3, extending a sentence to say > "Node MSD is the smallest MSD supported by the node on the set of interfaces > configured for use, [excepting links advertised with their own Link MSD TLV]" > would avoid the problem. This could have been a good optimization. However, this ship has sailed. BGP-LS is a mechanism to carry topology related information to a central controller. This information, as in this case, is obtained from the IGPs (OSPF or IS-IS). IOW, BGP-LS is simply carrying the same information that IS-IS/OSPF generated...with the same semantics, which is what the controller is expecting. The corresponding IGP specifications (rfc8491/rfc8476) contain the same language...if we change this document then we would have to change the IGP documents...and all the implementations. :-( Thanks! Alvaro.
- [Idr] Martin Duke's No Objection on draft-ietf-id… Martin Duke via Datatracker
- Re: [Idr] Martin Duke's No Objection on draft-iet… Alvaro Retana
- Re: [Idr] Martin Duke's No Objection on draft-iet… Martin Duke
- Re: [Idr] Martin Duke's No Objection on draft-iet… Jeff Tantsura