Cisco Systems, Inc. Cisco Systems, Inc. Broadcom Huawei Technologies Cisco Systems, Inc. This document defines the Post-Stack MPLS Network Action (MNA) Header Specification for carrying Network Actions encodings and Ancillary Data after the MPLS label stack, based on the In-Stack MNA Specification defined in "MPLS Network Action (MNA) Sub-Stack Specification." MPLS Network Actions can be used to influence packet forwarding decisions, carry additional Operations, Administration, and Maintenance information in the MPLS packet, or perform user- defined operations. This document follows the framework specified in RFC 9789.