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Advances in Pseudo-Wire Protection Framework: Key Changes and Next Steps

Learn about the latest developments in PW protection, including Preference and Protection TLVs, path protection, and enhancing congestion control. Explore multi-homed and segment protection options for a comprehensive overview.

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Advances in Pseudo-Wire Protection Framework: Key Changes and Next Steps

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  1. Pseudo-Wire Protection Mustapha Aissaoui,Florin Balus, Matthew Bocci, Hamid Ould-Brahim, Ping Pan IETF 66, Montreal

  2. What we have learned since last IETF • PW protection may mean different things to different people: • End-to-end path protection • Congestion relief • Multi-homed AC protection • Single-segment protection • Multi-segment protection • … • So, not only do we need protocol extension specification(s), we may need a framework/user document as well.

  3. Key Changes from the previous version • Defined a Preference TLV and a Protection TLV • Preference TLV: provide the capability for PW’s to preempt each other in case of congestion • Protection TLV: provide the protection information for Path Protection • Removed 1:N protection option • This does not make sense after further discussion • Added more text on messaging processing

  4. PW Path Protection • Protection TLV contains: • Reference ID: working and protection PW’s must be uniquely identified • Protection information: CAC-desired, fate-sharing working protection Reference ID is needed to know what to process on S-PE’s

  5. PW Congestion Control • Preference TLV contains: • Preference level of the PW’s • Use setup and holding preference to control the preemption Preempt less important PW’s PW: high preference Send status back PW: low preference

  6. Other protection cases… to be worked out in details Multi-homed PW Protection Individual PW’s PW Segment Protection Backup PW

  7. Next Step • The current proposal supports • PW preemption • PW Path Protection • Like to • Iron out other issues • Work with the framework/user-case draft people • Gather more feedback from carriers • Make this into a WG Working Document THANK YOU ALL

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