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IETF SFC: Service Chain Header draft-zhang-sfc-sch-01

IETF SFC: Service Chain Header draft-zhang-sfc-sch-01. H. Zhang, L. Fourie, HuaWei R. Parker, Affirmed Networks M. Zarny, Goldman Sachs. Rationale. First Draft of SCH in March, 2014 Now at -01, May, 2014 Written as an alternative to draft- quinn - nsh to address perceived shortcomings:

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IETF SFC: Service Chain Header draft-zhang-sfc-sch-01

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  1. IETF SFC:Service Chain Headerdraft-zhang-sfc-sch-01 H. Zhang, L. Fourie, HuaWei R. Parker, Affirmed Networks M. Zarny, Goldman Sachs IETF 90, Toronto, ONTARIO, CA, 23 JULY, 2014

  2. Rationale • First Draft of SCH in March, 2014 • Now at -01, May, 2014 • Written as an alternative to draft-quinn-nsh to address perceived shortcomings: • Eliminate mandatory fixed-sized metadata • Add variable length metadata • Add organizationally defined metadata • Add version field • Draft-Quinn-nsh since revised • Now at -03, July 3, 2014 • Adds optional variable length metadata to existing fixed format mandatory metadata • Adds version fields IETF 90, Toronto, ONTARIO, CA, 23 JULY, 2014

  3. Key Differences between SCH and NSH • Metadata • SCH proposes TLV metadata when required • NSH requires 4-32 bit general purpose metadata fields in every packet and allows additional optional TLV metadata • TLV ‘Type’ Authority for Metadata • SCH recommends IANA registry for ‘standard’ types plus use of 24-bit IEEE OUI for Vendor Specific types • NSH does not support ‘standard’ types; uses new 16-bit IANA registered organizational ID for Vendor Specific types • Next protocol indication • SCH uses 16-bit IEEE ethertype (Transparent Ethernet Bridging to indicate Ethernet) • NSH uses 8-bit enumerated type (i.e., v4, v6, Ethernet) • Other minor differences • NSH has a Critical attention bit • SCH uses 8 bit total length and metadata length vs 5 bit in NSH • Applicability -- SCH text describes usage to optionally carry only chain forwarding information; only metadata; or both IETF 90, Toronto, ONTARIO, CA, 23 JULY, 2014

  4. Recommendations • Merge NSH and SCH: • Resolve major differences • Mandatory fixed-size metadata in NSH vs. none in SCH • IANA registered ‘standard’ metadata types in SCH vs. none in NSH • Next protocol information enumerated in NSH vs. ethertype in SCH • Resolve multiple minor differences • Common • Thread consensus on chain id vs. path id • Explanatory language • Etc. IETF 90, Toronto, ONTARIO, CA, 23 JULY, 2014

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