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SMIv2 Translation to YANG

SMIv2 Translation to YANG. draft-schoenw-netmod-smi-yang-02. Jürgen Schönwälder Jacobs University. Changes since draft-schoenw-netmod-smi-yang-01. Inlined examples again (avoids page flipping) Preserving the SMIv2 nesting instead of flattening things (see discussion in Beijing)

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SMIv2 Translation to YANG

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  1. SMIv2 Translation to YANG draft-schoenw-netmod-smi-yang-02 Jürgen Schönwälder Jacobs University IETF 80 - NETMOD WG MEETING

  2. Changes since draft-schoenw-netmod-smi-yang-01 • Inlined examples again (avoids page flipping) • Preserving the SMIv2 nesting instead of flattening things (see discussion in Beijing) • Wrote some security considerations text • Clarifications and editorial improvements IETF 80 - NETMOD WG MEETING

  3. Issue #1: DISPLAY-HINTs • […] the DISPLAY-HINT value MAY be used to generate a regular expression for the YANG pattern statement within the type statement. • Options: • Declare this text to be sufficient • Elaborate how certain simple DISPLAY-HINTs can be translated, leaving the translation of more complex ones an implementation choice • Define a complete translation algorithm (hard, output usually not readable) • Declare that DISPLAY-HINTs are not translated at all IETF 80 - NETMOD WG MEETING

  4. Issue #2: Name Ambiguities • Options: • First definition encountered in a translation unit wins and declare certain valid SMIv2 updates to be avoided • Drop the idea to generate a hierarchy of nested containers (again) and instead merge all scalars into one container (name from MODULE-IDENTITY) followed by the tables • ? foo OBJECT IDENTIFIER ::= { baz 1 } bar OBJECT IDENTIFIER ::= { baz 1 } IETF 80 - NETMOD WG MEETING

  5. Issue #3: Enum/Bits Ambiguities • SMIv2 allows the descriptors of enumerated integers and named bits to change during revisions • YANG does not allow enums to be changed • Options: • declare certain valid SMIv2 updates to be avoided • ?? IETF 80 - NETMOD WG MEETING

  6. Issue #4: OBJECT-IDENTITY • Options: • Translate OBJECT-IDENTITIES into YANG containers? • Translate OBJECT-IDENTITIES into YANG identities? • Do both or do nothing? container usmNoAuthProtocol { description "No Authentication Protocol."; } identity usmNoAuthProtocol { base "smiv2:object-identity”; description “No Authentication Protocol."; } IETF 80 - NETMOD WG MEETING

  7. Issue #5: string vs binary • Presence of a DISPLAY-HINT is used to decide whether an OCTET STRING translates to a string or binary type • SMIv2 allows to add DISPLAY-HINTs during revisions, hence this is not safe • Options: • Use a union type to always allow textual strings and binary values; requires to “quote” string values in some way to avoid ambiguities • Always use the binary type (encoded in base64) • declare certain valid SMIv2 updates to be avoided • ?? IETF 80 - NETMOD WG MEETING

  8. Issue #6: smiv2 yang extensions • YANG extension statements (smiv2:oid, smiv2:display-hint, smiv2:max-access, smiv2:defval) are defined to keep SMIv2 information not directly translatable in a machine readable format • Options: • Implementations MUST generate these statements • Implementations SHOULD generate these statements IETF 80 - NETMOD WG MEETING

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