Re: [spring] Updating the SPRING WG Charter
<bruno.decraene@orange.com> Tue, 19 June 2018 12:38 UTC
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From: bruno.decraene@orange.com
To: Stewart Bryant <stewart.bryant@gmail.com>
CC: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Tue, 19 Jun 2018 12:38:21 +0000
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Subject: Re: [spring] Updating the SPRING WG Charter
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Hi Stewart, Speaking as individual contributor, please see inline [Bruno] From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Stewart Bryant Sent: Tuesday, June 19, 2018 1:19 PM On 01/06/2018 17:05, Rob Shakir wrote: The SPRING WG defines procedures that allow a node to steer a packet through an SR Policy instantiated as an ordered list of instructions called segments and without the need for per-path state information to be held at transit nodes. I am not sure where the line gets drawn with the per-path state statement. If I introduce a binding-SID to allow the creation of a path, have I introduced per-path state or not? In practise a management entity will choose between the infinity of possible binding-SIDs by considering the need to create specific paths and I would imagine that many will be instantiated just-in-time. I think that the key point is that the ingress creates the path by using SIDs to create a concatenation of paths, policies and resources. [Bruno] Agreed. And it can be argued that this creates a state on the ingress. An “outgoing” state, very roughly comparable to Next Hop Label Forwarding Entry (NHLFE)) However it could be argued that as soon as we introduced Binding SIDs we introduced per-path state. [Bruno] Adding a Binding SID to this SR policy introduces an “incoming” state, very roughly comparable to Incoming Label Map (ILM). But this gets additional benefit as it allows others SR nodes to use this state/SR policy. I’m not sure that in such high level text, we need to make such distinction. I think we might be best served by deleting the text I have highlighted. [Bruno] This text is mostly a copy/past from existing charter so is not really new: “allow a node to steer a packet along an explicit route using information attached to the packet and without the need for per-path state information to be held at transit nodes. ” At high level, I believe that this is a key distinction of spring/segment routing hence worth keeping in the high level introduction of the WG. Now do we need to add text about more specific details, such as BSID? I’d rather not, as I don’t see what this would bring. I also don’t think that this sentence prohibits the creation of states when required/useful. --Bruno - Stewart _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you.
- [spring] 答复: Updating the SPRING WG Charter Dongjie (Jimmy)
- Re: [spring] Updating the SPRING WG Charter Stewart Bryant
- Re: [spring] Updating the SPRING WG Charter Stewart Bryant
- Re: [spring] Updating the SPRING WG Charter David Allan I
- Re: [spring] Updating the SPRING WG Charter Stewart Bryant
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Stewart Bryant
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter bruno.decraene
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Ruediger.Geib
- Re: [spring] Updating the SPRING WG Charter Stewart Bryant
- Re: [spring] 答复: Updating the SPRING WG Charter Zafar Ali (zali)
- Re: [spring] Updating the SPRING WG Charter Voyer, Daniel
- Re: [spring] Updating the SPRING WG Charter bruno.decraene
- Re: [spring] 答复: Updating the SPRING WG Charter Rob Shakir
- Re: [spring] 答复: Updating the SPRING WG Charter Zafar Ali (zali)
- Re: [spring] Updating the SPRING WG Charter Loa Andersson
- [spring] 答复: Updating the SPRING WG Charter Dongjie (Jimmy)
- Re: [spring] Updating the SPRING WG Charter Zafar Ali (zali)
- Re: [spring] Updating the SPRING WG Charter Dongjie (Jimmy)
- Re: [spring] Updating the SPRING WG Charter Zafar Ali (zali)
- Re: [spring] Updating the SPRING WG Charter Ruediger.Geib
- Re: [spring] Updating the SPRING WG Charter Dongjie (Jimmy)
- Re: [spring] Updating the SPRING WG Charter Jeff Tantsura
- Re: [spring] Updating the SPRING WG Charter bruno.decraene
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Zafar Ali (zali)
- Re: [spring] Updating the SPRING WG Charter Zafar Ali (zali)
- Re: [spring] Updating the SPRING WG Charter Zafar Ali (zali)
- Re: [spring] Updating the SPRING WG Charter Voyer, Daniel
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Rob Shakir
- Re: [spring] Updating the SPRING WG Charter David Allan I
- Re: [spring] Updating the SPRING WG Charter Rob Shakir
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Eric C Rosen
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Voyer, Daniel
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Paul Mattes
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter Robert Raszuk
- Re: [spring] Updating the SPRING WG Charter Bernier, Daniel
- Re: [spring] Updating the SPRING WG Charter Alexander Vainshtein
- Re: [spring] Updating the SPRING WG Charter bruno.decraene
- Re: [spring] Updating the SPRING WG Charter Linda Dunbar
- Re: [spring] Updating the SPRING WG Charter Ruediger.Geib
- Re: [spring] Updating the SPRING WG Charter Dongjie (Jimmy)
- Re: [spring] Updating the SPRING WG Charter bruno.decraene
- Re: [spring] Updating the SPRING WG Charter Linda Dunbar
- Re: [spring] Updating the SPRING WG Charter Jeff Tantsura
- Re: [spring] Updating the SPRING WG Charter Linda Dunbar
- Re: [spring] Updating the SPRING WG Charter bruno.decraene
- Re: [spring] Updating the SPRING WG Charter Jeff Tantsura
- Re: [spring] Updating the SPRING WG Charter bruno.decraene
- [spring] Updating the SPRING WG Charter Rob Shakir
- Re: [spring] Updating the SPRING WG Charter Jeff Tantsura
- Re: [spring] Updating the SPRING WG Charter Linda Dunbar
- Re: [spring] Updating the SPRING WG Charter James N Guichard
- Re: [spring] Updating the SPRING WG Charter Rob Shakir
- Re: [spring] Updating the SPRING WG Charter Rob Shakir
- Re: [spring] Updating the SPRING WG Charter Xiejingrong
- Re: [spring] Updating the SPRING WG Charter Rob Shakir
- Re: [spring] Updating the SPRING WG Charter Michael McBride
- Re: [spring] Updating the SPRING WG Charter Rob Shakir