Internet Draft: Re-classification Analysis in Service Function Chaining

A new IETF Internet draft by Xinpeng Wei, Huawei discusses Service Function Chaining. 

Service Function Chaining (SFC) provides the ability to classify and
steer a flow via some network service(s). Some traffic flows require
re-classification to a new service chain. This may be, for example,
the result of further analysis of initial packets, or detection of
multiple types of