Using the IPv6 Flow Label for Performance Measurement with Alternate Marking Method in Segment Routing

[RFC6294] makes a survey of Proposed Use Cases for the IPv6 Flow Label. The IPv6 protocol includes a flow label in every packet header, but this field is, according to [RFC6294], not used in practice. This document describes how the alternate marking method can be used as the passive performance measurement method in a IPv6 domain.