Hi Adrian, Thanks for the interest and comments. Please see inline for some thoughts and replies.
Best, Dirk -----Original Message----- From: Adrian Farrel [mailto:[email protected]] Sent: 09 March 2022 18:36 To: Dirk Trossen <[email protected]>; [email protected]; [email protected] Subject: RE: New Version Notification for draft-trossen-rtgwg-impact-of-dlts-00.txt Hi Dirk, Thanks for the notification about this document. I've been reading it (hooray) and I have some questions (boo). [DOT] Great you read it and questions are very welcome; we only just started so have questions ourselves to go after in the future work. I have heard some people proposing the use of blockchain (and so DLT) as a way of signing things in the routing world. For example, routing advertisements (either at the BGP level or within IGPs) could be signed, and blockchain could be used as these advertisements are passed on. I have also heard discussion of using blockchain for proof of transit both in regular packet flows (e.g., iOAM) and in Service Function Chaining where proof of execution of functions is desired. [DOT] Yes, the IIC whitepaper, where this work originated, talked about those network-related usages of DLTs. The draft currently does not cover this since it looks at DLTs as an application for some sort of distributed storage/consensus, regardless of what that data may be. We based on our initial evaluation on Ethereum, i.e. a PoW (proof-of-work) based DLT system. Given the nature of the proof, its communication patterns, which we continue to decipher from the code,included as a first version in the draft, are particularly chatty. This comes largely from the diffusion nature of its (multipoint) communication, resulting in a rather large overhead of connection attempts, failures but also re-attempts to uphold the random nature of the diffusion pool (we are working on experimental quantifications of such overhead with the first results included in the draft). Such chattiness is an issue for any application IMO, let alone one that actually intends to 'manage' distributed network data. OTOH, proof-of-stake (PoS) approaches may help, also leading to different overlay management approaches (based on our current understanding - do note that we are not DLT experts but networking folks looking at an application and its impact on networks). Whether or not that would make them more suitable to network-related management tasks is something a DLT expert may be able to answer. Such approaches seem to provide for a recursion of the impact of DLTs. That is, the networking needed to resolve DLTs is itself subject to DLTs that need to be resolved. [DOT] Yes, indeed, see above about the chattiness over an infrastructure that the application itself intends to manage. It reminds me a bit of SDN and OpenFlow, where the former was touted to enable novel routing mechanisms beyond 'just IP', yet its control protocol requires an IP infrastructure to manage the switches. So we built indeed SDN-based test beds in the past, where the control plane included the routing and protocol we had removed in the data plane. When presenting this work, it always made for funny remarks ;-) Have you seen anything like this and what do you think are the consequences? [DOT] What the consequences of this may be is difficult to judge IMO. Maybe an SDN-like situation, i.e., still having an IP-based control overlay which then manages the remaining IP service plane? Another possible direction to look into is using ANIMA concepts to bootstrap (and maintain) a DLT-like control overlay. But this is also why we are asking the community for possible network innovations that may help improve on the efficacy of DLTs. One approach we looked into, as an example but this still needs more work, is 'L3-based service routing' as a form of semantic routing (hence the hint to the semantic routing discussions in the draft). Here, we interpret the DLT as a service provided across the network. I could see this being provided as a baseline/bootstrap service through which to manage the (service routing) data that is being enriched over time by other services. But again, we were hoping to find more folks in the community who have thought deeper along those lines; we are ju st at the start of doing so. Thanks, Adrian -----Original Message----- From: rtgwg <[email protected]> On Behalf Of Dirk Trossen Sent: 02 March 2022 13:16 To: Dirk Trossen <[email protected]>; [email protected]; [email protected] Subject: RE: New Version Notification for draft-trossen-rtgwg-impact-of-dlts-00.txt All, We have posted an updated to the draft below at https://datatracker.ietf.org/doc/draft-trossen-rtgwg-impact-of-dlts/. We now welcome Mike McBride and Xinxin Fan as additional co-authors and have also added language into the introduction to clarify our initial insights being limited to PoW -based DLT systems, which lead to some characteristic communication patterns and associated inefficiencies compared to, say, PoS-based systems. Please provide any comments you may have on the draft and/or its insights, including any interests in contributing in its expansion (e.g., to other DLT systems). Best, Dirk -----Original Message----- From: routing-discussion [mailto:[email protected]] On Behalf Of Dirk Trossen Sent: 14 February 2022 16:16 To: [email protected]; [email protected] Subject: FW: New Version Notification for draft-trossen-rtgwg-impact-of-dlts-00.txt All, We posted the draft below to continue a piece of work initiated in the Industry IoT Consortium (IIC) on understanding the "Impact of DLTs on provider networks", leading to the whitepaper at https://www.iiconsortium.org/pdf/2022-01-10-Impact-of-Distributed-Ledgers-on -Provider-Networks.pdf With this draft, we solicit feedback from the wider IETF community on our insights regarding DLTs with the desire to broaden our findings with the expertise we can find here but also to capture possible network and routing innovations that may improve on the impacts we have identified. If you have any comments or would like to contribute to this work, please do let us know, either on the list or directly to the authors. Best, Dirk (on behalf of the authors) -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: 14 February 2022 16:10 To: David Guzman <[email protected]>; Dirk Trossen <[email protected]> Subject: New Version Notification for draft-trossen-rtgwg-impact-of-dlts-00.txt A new version of I-D, draft-trossen-rtgwg-impact-of-dlts-00.txt has been successfully submitted by Dirk Trossen and posted to the IETF repository. Name: draft-trossen-rtgwg-impact-of-dlts Revision: 00 Title: Impact of DLTs on Provider Networks Document date: 2022-02-14 Group: Individual Submission Pages: 16 URL: https://www.ietf.org/archive/id/draft-trossen-rtgwg-impact-of-dlts-00.txt Status: https://datatracker.ietf.org/doc/draft-trossen-rtgwg-impact-of-dlts/ Htmlized: https://datatracker.ietf.org/doc/html/draft-trossen-rtgwg-impact-of-dlts Abstract: This document discusses the impact of distributed ledger technologies being realized over IP-based provider networks. The focus here lies on the impact that the DLT communication patterns have on efficiency of resource usage in the underlying networks. We provide initial insights into experimental results to quantify this impact in terms of inefficient and wasted communication, aligned along challenges that the DLT realization over IP networks faces. This document is intended to outline this impact but also opportunities for network innovations to improve on the identified impact as well as the overall service quality. While this document does not promote specific solutions that capture those opportunities, it invites the wider community working on DLT and network solutions alike to contribute to the insights in this document to aid future research and development into possible solution concepts and technologies. The findings presented here have first been reported within the similarly titled whitepaper released by the Industry IoT Consortium [IIC_whitepaper]. 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