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Edge-to-Edge Pseudo Wire (PW) Service: Pros, Cons, and Questions

This article explores the pros and cons of the "Edge-to-Edge" Pseudo Wire (PW) service and raises questions regarding its implementation. It discusses the benefits of migration to PW, the use of a single IWF for multiple customers, the responsibility of the service provider, and the suitability for enterprise scenarios. It also raises questions about the PWE3 Charter, the perception of pseudo wire as an unshared link, and potential modifications to the PWE3 architecture.

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Edge-to-Edge Pseudo Wire (PW) Service: Pros, Cons, and Questions

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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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