MPLS-TP Linear Protection ietf-mpls-tp-linear-protection Nurit Sprecher Annamaria Fulignoli Stewart Bryant Eric Osborne Yaacov Weingarten )

Since we saw you last  Received comments on the mailing list  Partly editorial  Highlighted some small inconsistencies between different statements (use of Fpath and Path fields)  Requested clarification of the Principles of Operation  Pointed to possible technical problems with state transitions  Requested more alignment with ITU APS protocol format  To address the comments the editors and authors have held off-line discussions  Addressed editorial comments directly  Defined new states to address technical issues  Clarified the issues of input priorities and state transitions

Operative conclusions  Principle of operation –  Separate priority of local inputs from other parameters  Request field reports local status at end-point  Path field identifies traffic carried on protection path  Adding support for additional states  Normal, Unavailable, Protecting administrative, Protecting failure, WTR, DNR  Clearly define how end-point reacts to different inputs  State dependent – of local or remote origin  Differentiate reaction to local and remote inputs  Specify what message is generated in each case

Additional features -considered  Support for 1:n protection  Could be single-phase by allowing the protection path to simultaneously protect multiple paths (statmux 1:n) – future applicability document  Multiple-phase, similar to TDM 1:n protection – where protection path dedicated to protecting a single working path (mutex 1:n)  Would need future draft and use extension

Next steps  New revision just uploaded – based on the reconsiderations  Request comments and contributions to make the draft more complete