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Matthew Bocci (Alcatel) Stewart Bryant (Cisco)

An Architecture for Multi-Segment Pseudo Wire Emulation Edge-to-Edge draft-bocci-bryant-pwe3-ms-pw-architecture-00.txt. Matthew Bocci (Alcatel) Stewart Bryant (Cisco). Objectives & Key Issues. Objectives Document the main network scenarios for MS-PW applicability

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Matthew Bocci (Alcatel) Stewart Bryant (Cisco)

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  1. An Architecture for Multi-Segment Pseudo Wire Emulation Edge-to-Edgedraft-bocci-bryant-pwe3-ms-pw-architecture-00.txt Matthew Bocci (Alcatel) Stewart Bryant (Cisco) draft-bocci-bryant-ms-pw-architecture-00.txt

  2. Objectives & Key Issues • Objectives • Document the main network scenarios for MS-PW applicability • Define architectural framework: • Specify which protocol functions that we need • Key Issues • Applicability of MS-PWE3 vs. L2VPN • Protocol Layering Model • Network reference Models • PE Reference Model • Protocol Stack Reference Model • Gaps draft-bocci-bryant-ms-pw-architecture-00.txt

  3. U-PE U-PE MS-PW S-PE S-PE U-PE U-PE Applicability & Domain of MS PWE3 • A MS-PW is a single PW that for technical or administrative reasons is segmented into a number of concatenated hops. • From perspective of U-PE, MS-PW is indistinguishable from SS-PW. • MS-PW abstracts complex PWs from the construction of a L2VPN • PWE3 does not do: PSN tunnel setup, PSN tunnel maintenance and routing, U-PE discovery • PWE3 does do: S-PE selection to reach a U-PE draft-bocci-bryant-ms-pw-architecture-00.txt

  4. Protocol Layering Model • Same as RFC 3985 except: • Pseudo-wires may be considered to be a separate layer to the PSN tunnel. • Independent of the PSN tunnel routing, operations, signalling and maintenance. • Design of PW domains should not imply the underlying PSN routing domains are the same. • MS-PW will reuse protocols of the PSN draft-bocci-bryant-ms-pw-architecture-00.txt

  5. Network Reference Models • Intra-provider & inter-provider Native |<-----------Pseudo Wire----------->| Native Service | | Service (AC) | |<-PSN1-->| |<-PSN2-->| | (AC) | V V V V V V | | +----+ +-----+ +----+ +----+ | |UPE1|=========|SPE1 |=========|UPE2| | +----+ | |-------|....PW.Seg't1........PW Seg't3.....|----------| | | CE1| | | | | | | | | |CE2 | | |-------|....PW.Seg't2.......|PW Seg't4.....|----------| | +----+ | | |=========| |=========| | | +----+ ^ +----+ +-----+ +----+ ^ | Provider Edge 1 ^ Provider Edge 2 | | | | | | | | PW switching point | | | |<------------------- Emulated Service ------------------>| draft-bocci-bryant-ms-pw-architecture-00.txt

  6. PE Reference Model • Pre-processing in U-PEs as RFC 3985 • Processing in S-PEs: • No native service processing • Egress PW label mapping based on ingress label • Static or dynamic config • 1:1 mapping between ingress and egress PW +------------------------------------------+ | S-PE Device | +------------------------------------------+ Ingress | | | | Egress PW instance | Single | | Single | PW Instance <==========>X PW Instance + Forwarder + PW Instance X<==========> | | | | +------------------------------------------+ draft-bocci-bryant-ms-pw-architecture-00.txt

  7. Protocol Stack Reference Model Remove PSN1 demuxAdd PSN2 demuxApply policies +----------------+ +----------------+ |Emulated Service| |Emulated Service| |(e.g., TDM, ATM)|<======= Emulated Service =======>|(e.g., TDM, ATM)| +----------------+ +----------------+ | Payload | | Payload | | Encapsulation |<== Multi-segment Pseudo Wire ===>| Encapsulation | +----------------+ +--------+ +----------------+ |PW Demultiplexer|<PW Segment>|PW Demux|<PW Segment>|PW Demultiplexer| +----------------+ +--------+ +----------------+ | PSN Tunnel, |<PSN Tunnel>| PSN |<PSN Tunnel>| PSN Tunnel, | | PSN & Physical | |Physical| | PSN & Physical | | Layers | | Layers | | Layers | +-------+--------+ +--------+ +----------------+ | .......... | .......... | | / \ | / \ | +==========/ PSN \===/ PSN \==========+ \ domain 1 / \ domain 2 / \__________/ \__________/ `````````` `````````` draft-bocci-bryant-ms-pw-architecture-00.txt

  8. Other Issues • Control Plane: • Can be static or dynamic • Gaps in current version of the draft: • Maintenance reference model • Security issues draft-bocci-bryant-ms-pw-architecture-00.txt

  9. Conclusions • Architecture is fundamental to the solution • Would like to achieve consensus as early as possible • Please provide comments and text to improve the draft! draft-bocci-bryant-ms-pw-architecture-00.txt

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