Softwire wg Alain Durand Comcast David Ward Cisco

Softwire wg Alain Durand, Comcast David Ward, Cisco

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Wg status • Charter went to internal & external review • Comments received • Chairs, AD & IESG members started addressing the comments… • …AD had a baby! (Congratulation!) • As of this morning, we are approved as a wg by the IESG! – Secretariat still needs to make it formal

Agenda • Overview of meeting in Paris (Chairs) • Hub and Spoke Problem Overview (Durand) – Hub and Spoke Illustration (Miyakawa, Palet, Williams) • Mesh Problem Overview (Ward) – Mesh Illustration (Li) • Status of draft problem statement (Chairs) • Next steps (Chairs, all)

Paris Interim Meeting • We held an interim meeting in Paris on October 11 th-12 th – 18 participants, intense discussions, very productive meeting • Focus on problem statement – draft-durand-softwire-problem-statement-00. txt edited in rush just before the cut-off date (excuse typos…) • 2 problems identified, topology driven: – Access network, customer initiated, one exit path [Hubs & Spokes] – Core network, ISP initiated, complex routing topology [Mesh] • We will look at both problems independently – Hopefully, they will share enough common technology

Hub & Spoke Description

Hubs & Spokes Problem • Description: – Access network problem, customer initiated, one exit path • Applicability: – ISPs with Dual Stack core and a number of dual stack Points of Presence (“Hubs”) where they connect their customers. • 3 usage cases have been identified: – the networks between the CPE router and the hub supports only one address family. – the CPE router cannot be easily upgraded to support both address families, a softwire is created from a node behind the CPE router – Same, but initiated from another router behind the CPE router

Usage Case 1 Dual AF Softwire Concentrator Single AF CPE Router Dual AF Softwire Initiator

Usage Case 2 Dual AF Softwire Concentrator CPE Router Single AF Dual AF Host Softwire Initiator

Usage Case 3 Dual AF Softwire Concentrator CPE Router Single AF Dual AF Router Softwire Initiator

Hubs & Spokes Assumptions • NAT/PAT (in IPv 4) is present • Not always upgradeable CPE router • “Stable” IPv 6 prefix desired • Softwires initiated by customer – Customer side: softwire initiator • May be a host or a router – ISP side: softwire concentrator • Routing: – default route from softwire initiator to concentrator • (CPE routers do not generally run a routing protocol, but the softwire solution will work even if it does. )

Hubs & Spokes Properties (1) • Scaling: – to the millions of softwire customers • Set-up time (a. k. a. “latency”) – A fraction of the total set-up time of the CPE router • Multicast – Classic multicast solution run over the softwire

Hubs & Spokes Properties (2) • Security – Must support secure user authentication • May be turned off. – Must be able to support payload security when desired outside of the softwire mechanism • Operation And Management – – Keep alive Usage accounting End point failure detection (inner address of the softwire) Path failure detection (outer address of the softwire)

Hubs & Spokes Encapsulations • Critical path – IPv 6/IPv 4 – IPv 6/UDP/IPv 4 – IPv 4/IPv 6 • Other encapsulations to be supported later (e. g. IPv 6/IPv 6)

Hub & Spoke Illustrations Slides from Shin, Carl & Jordi

Mesh Description

Mesh Problem • Description: – Core network problem, ISP initiated, complex routing topology • Applicability: – ISPs (or large enterprise networks acting as ISP for their internal resources) establish connectivity to 'islands' of networks of one address family type across a transit core of a differing address family type.

Mesh Diagram IPv 4 Access Island BGP Dual-Stack AFBR IPv 6 -only Transit Core IPv 6 Access Network BGP Dual-Stack AFBR IPv 4 Access Island

AFBR • To provide reachability across the transit core dual-stack devices are installed that act as "Address Family Boundary Routers”. – Creates a limited dual-stack edge network – Core can be solely one AF and islands don’t require upgrade • AFBR provide peering across AS or within an AS • Can be used inconjunction w/ route reflectors

Full Mesh Overlay for Many 2 Many connnectivity V 4 island V 6 transit AFBR V 4 island

May have different encaps available V 4 island V 6 transit core AFBR MGRE, L 2 TPv 3 V 4 island AFBR L 2 TPv 3 MPLS MGRE IPsec AFBR MGRE IPsec V 4 island Must have solution to allow for negotiation and preference of encap

Must support Applications…. L 3 VPN using 2547 bis Route Reflector VPN V 4 island V 6 transit AFBR V 4 island AFBR VPN V 4 island VPN

Mesh properties (1) • Scaling – Number of AFBR related to the number of islands and exit points from islands (x 0 -x 00 islands) • We know of no cases of x 0000++ islands – Full routing table needs to be supported • Islands can carry x 00000 of routes • Services / Encapsulation – – v 4/v 6 or v 6/v 4 L 2 VPN L 3 VPN (overlapping address spaces) Multicast a must in all cases • Security – No “user” authentication – Authentication for control plane • may be turned off – Support for IPsec in data plane (outside of softwires)

Mesh properties (2) • Operation And Management – – – – No need for keepalive Usage accounting End point failure detection Path failure detection Flexible encapsulation possibilities Interconnection at L 2 or L 3 Cannot require full mesh of all AFBRs under all circumstances

Mesh Illustrations Slides from Pr Li

Problem Statement Draft Status • Problem statement described in draft-durand-softwire-problem-statement-00. txt • Comments received on the ML – Typos – Some minor stuff – n engineer that comes up with n+1 design syndrome – 3 issues raised about the Mesh problem: • Scale – Presented today • Should this be solved at layer 2 or layer 3 – Crystal ball says both (This belongs to the solution space) • Should the softwires be initiated from the PE or CPE or both? – Crystal ball says most commonly PE (for mesh)

Next Steps • Mark finish the creation of the wg! – Done, minor nits on charter + secretariat action • Rev problem statement draft – draft-ietf-softwire-problem-statement-00. txt Nov. 14 th – draft-ietf-softwire-problem-statement-01. txt Dec. 1 st • WG Last Call on problem statement draft – Target: Dec. 8 th • Interim meeting on solution space (Jan/Feb 06) – Last was in Europe, Hong Kong?