Please ask your customers on which method they prefer. Both methods and all three path identification have been developed and deployed. We are only describing how protocols suppose to work, not mandating customer requirements. If you have questions on protocol detail issues, please forward them to the MPLS list. Thanks! - Ping > Hi, > > Also Facility back-up and Detour both do protection. Which > one must be implemented to comply with this draft? For > interoperability reasons it seems that one of them should be > Mandatory and the other one Optional. > > Thanks, > Shahram Davari >