*** General comments This document contains two YANG modules: ietf-segment-routing-common and ietf-segment-routing. The latter augments ietf-routing with data necessary for configuring and operating segment routing, but also provides groupings that define data to be used in segment routing extensions of routing protocols and interfaces. This design makes it relatively easy to define such IGP extensions. **** Naming - My suggestion is to review the identifiers defined in the modules so as to adhere more closely to the identifier naming conventions in sec. 4.3.1 of RFC 8407. It is subjective to decide which acronyms are well-known but, in my view, "srgb", "srlb" and "msd" do not fall into this category. For example, "msd" can be changed to to "max-sid-depth" (both as a data node and a feature). - On the other hand, the "-cfg" suffix in the names of several groupings should be removed - according to RFC 8407, identifiers should not carry semantics. (And perhaps the same groupings can also be used for state data?) **** Revisions The YANG modules contain revision dates of all development versions. Although RFC 8407 doesn't require to do so, I think it can be useful for the developmnent and testing of the modules. However, these development revisions should be removed before publishing the RFC (maybe the authors intend to do so). **** References Normative References should include the RFCs defining YANG modules that are imported by the segment-routing modules: 6991, 7223, 8294 and 8349. *** Specific comments - Containers "connected-prefix-sid-map" and "local-prefix-sid" have subcontainers "ipv4" and "ipv6" that only differ in the type of the "prefix" leaf. An alternative solution can be to change the outer containers into lists with "address-family" as the key. Did the authors discuss this option? - The text uses the terms "states" and "operational states" in several places. The plural form looks weird to me.