Cisco Systems, Inc. Cisco Systems, Inc. Broadcom Futurewei Technologies Juniper Networks This document defines the MPLS Network Actions (MNA) sub-stack solution for carrying Network Actions and Ancillary Data in the MPLS label stack. MNA can be used to influence packet forwarding decisions, carry additional Operations, Administration, and Maintenance information in the MPLS packet or perform user-defined operations. The solution specified in this document addresses the requirements for In-stack network action and In-stack data found in "Requirements for MPLS Network Actions". This document follows the architectural framework for the MNA technologies specified in "MPLS Network Actions (MNA) Framework".