Hi Zafar, As mentioned in my previous mail, the VPN+ drafts and this work item require new functionality to be added to SR, which is to associate SR with particular allocated resources and treatment. IMO this is not covered by existing SR mechanisms. It is different from Diffserv QoS, and it is not pure controller-based accounting, because in the data plane some mechanism is needed to make sure different services will be treated accordingly and not impact each other.
Thanks for the comments in London, we are working on the updates of the VPN+ drafts, hopefully they will be published for open review soon. Best regards, Jie From: spring [mailto:spring-boun...@ietf.org] On Behalf Of Zafar Ali (zali) Sent: Wednesday, June 13, 2018 11:30 PM To: bruno.decra...@orange.com; Zafar Ali (zali) <zali=40cisco....@dmarc.ietf.org> Cc: SPRING WG List <spring@ietf.org>; Zafar Ali (zali) <z...@cisco.com>; Rob Shakir <robjs=40google....@dmarc.ietf.org> Subject: Re: [spring] Updating the SPRING WG Charter Hi Bruno, I am aware of the VPN+ draft but IMO this document or Slicing, in general, is an informational use-case document (E.g., similarly SD-WAN does not have a milestone in the Charter). I do not think that there is any new behavior needed beyond SRTE, SRVPN, Flex-Algo, Diffserv QoS and SR SFC, etc. What is missing is the controller doing the bandwidth (resource) accounting but this outside the scope of IETF. Furthermore, the specifics in the VPN+ specifics draft against this milestone are missing. The same comments were also raised when draft-dong-spring-sr-for-enhanced-vpn was presented to the Spring WG in London. Thanks Regards … Zafar From: "bruno.decra...@orange.com<mailto:bruno.decra...@orange.com>" <bruno.decra...@orange.com<mailto:bruno.decra...@orange.com>> Date: Tuesday, June 12, 2018 at 12:13 PM To: "Zafar Ali (zali)" <zali=40cisco....@dmarc.ietf.org<mailto:zali=40cisco....@dmarc.ietf.org>> Cc: "Zafar Ali (zali)" <z...@cisco.com<mailto:z...@cisco.com>>, Rob Shakir <robjs=40google....@dmarc.ietf.org<mailto:robjs=40google....@dmarc.ietf.org>>, SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>> Subject: RE: [spring] Updating the SPRING WG Charter Dear Zafar, Please see inline [Bruno] From: spring [mailto:spring-boun...@ietf.org] On Behalf Of Zafar Ali (zali) Sent: Tuesday, June 12, 2018 3:45 PM To: Rob Shakir; SPRING WG List Cc: Zafar Ali (zali) Subject: Re: [spring] Updating the SPRING WG Charter Dear Rob, Bruno, I have a question on the specifics of the following milestone: * Using SR as the mechanism to identify sets of resources in networks with SR-MPLS and SRv6 dataplanes. I do not know of any specific use-case, requirement or an individual draft associated with this milestone beyond what is already covered by other milestones (e.g., by “Segment Routing policies and the associated steering and traffic engineering mechanisms”). What specific deliverable you have in mind? Is there an individual(s) draft against this milestone? Please advise. [Bruno] Would the following pointers provide enough context? https://mailarchive.ietf.org/arch/msg/spring/canXoxLZCwRZ_yFcV3U7RXRwfpM https://tools.ietf.org/html/draft-bryant-rtgwg-enhanced-vpn-02#section-4.3.6 https://tools.ietf.org/html/draft-dong-spring-sr-for-enhanced-vpn-00#section-2 Regards, --Bruno Thanks Regards … Zafar From: spring <spring-boun...@ietf.org<mailto:spring-boun...@ietf.org>> on behalf of Rob Shakir <robjs=40google....@dmarc.ietf.org<mailto:robjs=40google....@dmarc.ietf.org>> Date: Friday, June 1, 2018 at 12:07 PM To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>> Subject: [spring] Updating the SPRING WG Charter Hi SPRING, After the discussions on the list and in London relating to the charter, Bruno and I have been working to propose a new charter for the WG with Martin, and the other routing ADs. The text for this suggested charter is below. We would like to solicit WG feedback on the charter text prior to Martin taking to the IESG. We'd like to try and get the charter agreed prior to IETF 102 in Montréal. The Source Packet Routing in NetworkinG (SPRING) Working Group is the home of Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serves as a forum to discuss SPRING networks operations, define new applications, and specify extensions of Segment Routing technologies. 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. Full explicit control (through loose or strict path specification) can be achieved in a network comprising only SPRING nodes, however SPRING nodes must inter-operate through loose routing in existing networks and may find it advantageous to use loose routing for other network applications. The scope of the SPRING WG work includes both single Autonomous System (AS) and multi-AS environments. Segment Routing operates within a trusted domain; as described in the architecture, a node imposing a segment list is assumed to be allowed to do so. Nonetheless, the SPRING WG must strive to identify and address security considerations brought up by the technologies it defines. The technologies SPRING WG defines may be applicable to both centralised and distributed path computation. SPRING WG should avoid modification to existing data planes that would make them incompatible with existing deployments. Where possible, existing control and management plane protocols must be used within existing architectures to implement the SPRING function. Any modification of - or extension to - existing architectures, data planes, or control or management plane protocols should be carried out in the WGs responsible for the architecture, data plane, or control or management plane protocol being modified and in coordination with the SPRING WG, but may be done in SPRING WG after agreement with all the relevant WG chairs and responsible Area Directors. The SPRING WG will manage its specific work items by milestones agreed with the responsible Area Director. The work-items of the SPRING WG include functional specifications for: o Segment Routing policies and the associated steering and traffic engineering mechanisms. o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplanes. o SRv6 network programming for the underlay networks and overlay services, and including data plane behavior and functions associated with SIDs o Operation, Administration and Management (OAM), and traffic accounting in networks with SR-MPLS and SRv6 data planes in the case where SR introduces specificities compared to MPLS or IPv6 technologies. o Performance Management (PM) and monitoring in networks with SR-MPLS and SRv6 data planes in the case where SR introduces specificities compared to MPLS or IPv6 technologies. o The inter-working between SRv6 and SR-MPLS. o Using SR as the mechanism to identify sets of resources in networks with SR-MPLS and SRv6 dataplanes. Any of the above may require architectural extensions. The work-items of SPRING WG also include: o Specification of management models (YANG) for Segment Routing applications, services and networks with SR-MPLS and SRv6 dataplanes. The SPRING WG will coordinate and collaborate with other WGs as needed. Specific expected interactions include (but may not be limited to): * mpls on the MPLS dataplane and OAM extensions, * 6man on the IPv6 dataplane for SR and associated OAM extensions * lsr on OSPF and IS-IS extensions to flood SPRING-related information * idr for BGP extensions * bess for VPN control plane * pce on extensions to communicate with an external entity to compute and program SPRING paths * teas on generic traffic engineering architecture Please comment on the contents of the charter text on the list. Thanks, Bruno & Rob _________________________________________________________________________________________________________________________ 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 mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring
