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Status: Held for Document Update (1)

RFC 9350, "IGP Flexible Algorithm", February 2023

Errata ID: 7376
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT, PDF, HTML
Reported By: Nikolai Malykh
Date Reported: 2023-03-04
Held for Document Update by: John Scudder
Date Held: 2023-03-06

Section 6 says:

   One of the limitations of IS-IS [ISO10589] is that the length of a
   TLV/sub-TLV is limited to a maximum of 255 octets.  For the FAD sub-
   TLV, there are a number of sub-sub-TLVs (defined below) that are
   supported.  For a given Flex-Algorithm, it is possible that the total
   number of octets required to completely define a FAD exceeds the
   maximum length supported by a single FAD sub-TLV.  In such cases, the
   FAD MAY be split into multiple such sub-TLVs, and the content of the
   multiple FAD sub-TLVs are combined to provide a complete FAD for the
   Flex-Algorithm.  In such a case, the fixed portion of the FAD (see
   Section 5.1) MUST be identical in all FAD sub-TLVs for a given Flex-
   Algorithm from a given IS.  

It should say:

   One of the limitations of IS-IS [ISO10589] is that the length of a
   TLV/sub-TLV is limited to a maximum of 255 octets.  For the FAD sub-
   TLV, there are a number of sub-sub-TLVs (defined below) that are
   supported.  For a given Flex-Algorithm, it is possible that the total
   number of octets required to completely define a FAD exceeds the
   maximum length supported by a single FAD sub-TLV.  In such cases, the
   FAD MAY be split into multiple such sub-TLVs, and the content of the
   multiple FAD sub-TLVs are combined to provide a complete FAD for the
   Flex-Algorithm.  In such a case, the fixed portion of the FAD (see
   Section 5.1) MUST be identical in all FAD sub-TLVs for a given Flex-
   Algorithm from a given IS (Intermediate System).

Notes:

Although "IS" is listed in https://www.rfc-editor.org/materials/abbrev.expansion.txt as well-known, this evidently confused at least one reader, so it seems worth expanding on first use. See also https://mailarchive.ietf.org/arch/msg/lsr/LICQJ8U3cBAY9Z1LHMfAI4v7xRg/

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