I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please wait for direction from your document shepherd or AD before posting a new version of the draft. For more information, please see the FAQ at . Document: draft-ietf-mpls-rfc8287-len-clarification-?? Reviewer: Ines Robles Review Date: 2019-08-09 IETF LC End Date: None IESG Telechat date: Not scheduled for a telechat Summary: I believe the draft is technically good. This document is well written. The document updates RFC8287 by clarifying the length for the following Segment ID Sub-TLVs: IPv4 IGP-Prefix Segment ID Sub-TLV, IPv6 IGP-Prefix Segment ID Sub-TLV and IGP-Adjacency Segment ID Sub-TLV. version 4 addresses my comments done for version 2. Major issues: Not found Minor issues: Not found Nits/editorial comments: Not found