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Understanding Pseudo Wire Edge-to-Edge (PW-CE2-E) Framework in Network Services

This document explores the concept of Edge-to-Edge in Pseudo Wire (PW) communications, specifically focusing on PW-CE2-E as defined by the IETF. It discusses the meaning of “Edge-to-Edge” in the context of Provider Edge (PE) to Customer Edge (CE) communication as well as CE to CE scenarios. Key advantages such as migration without customer upgrades, cost efficiencies in Ethernet access, and the role of the Interworking Function (IWF) are analyzed. Challenges and questions about the architecture and service provider responsibilities are also addressed to better understand implementation considerations.

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Understanding Pseudo Wire Edge-to-Edge (PW-CE2-E) Framework in Network Services

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  1. PW-CE2 E PWE3 – 58th IETF 10 November 2003 Yaakov (J) Stein

  2. PW-PE2-E In standard PWE “Edge to Edge” means “PEto PE” PW native service native service CE CE IWF PE PE IWF attachment circuit attachment circuit PSN

  3. PW-CE2-E Alternatively “Edge to Edge” could mean “CEto CE” PW CE IWF IWF CE PE PE attachment circuit attachment circuit PSN

  4. Pros & Cons PW-PE2-E • migration to PW doesn’t require customer upgrade • single (large) IWF serves multiple customers • service provider responsible for IWF PW-CE2-E • Ethernet access may be cheaper • easier to provide many different services • customer responsible for IWF • suitable for enterprise scenarios

  5. Questions • PWE3 Charter states • Service providers are seeking to offer multiple services acrossa common packet switched network … • From the customer perspective, the pseudo wire is perceived as anunshared link … of the chosen service • does this rule out PW-CE2-E ? • if so, can we fix it when we re-charter? • PWE3 architecture draft figure 2 (PWE3 Network Reference Model) is specifically PW-PE2-E • do we want to modify this ? • do we want to define 2 scenarios?

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