@techreport{vandevelde-sfc-nsh-length-overload-00, number = {draft-vandevelde-sfc-nsh-length-overload-00}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-vandevelde-sfc-nsh-length-overload/00/}, author = {Gunter Van de Velde and Martin Vigoureux and Praveen Muley}, title = {{Network Services Header Context Allocation Identifier}}, pagetotal = 5, year = 2016, month = oct, day = 17, abstract = {The specification of the NSH MD Type 1 header {[}draft-ietf-sfc-nsh{]} mandates four Context Headers, 4-byte each, and they MUST be added immediately following the Service Path Header. As direct consequence, an NSH MD Type 1 header is always Length 0x6 (six 4-byte words). As a result, the Length field of the NSH MD Type 1 header provides an information which is known by simply looking at the "MD Type" field. However, while {[}draft-ietf-sfc-nsh{]} does not specify the encoding of these Context Headers, other specifications have started to do so. A need to distinguish types of Context Headers therefore arises. This draft proposes to overload the Length field of an NSH MD Type 1 as Meta-Data context allocation identifier and to create a IANA repository for NSH MD Type 1 allocation schemes. The NSH MD Type 1 Length field overload intends to allow universal understanding at any network location and by any network device of the context allocation structure.}, }