Requirements for Service Protection Across External Interfaces
MEF 32 is a specification document developed by the Technical Committee of the MEF.
"This document contains requirements for protecting Ethernet Services at an External Interface against link or a Network Element (NE) failure. This specification identifies resiliency requirements at external interfaces applicable to MEF Service and associated Service End Points, which associate services with External Interfaces. MEF would like these requirements to be considered when designing a mechanism for Service Protection across an External Interface. The current MEF standardized External Interfaces are the UNI and ENNI. These requirements aim to cover a wide range of MEF Ethernet service types as well as a wide range of network deployments in which the EIs are MEF defined EIs."