I have reviewed this document as part of the Ops area directorate's ongoing effort to review all IETF documents being processed by the IESG.  These comments were written primarily for the benefit of the Ops area directors.
Document editors and WG chairs should treat these comments just like any other last-call comments.

This document extends Flex-Algorithm that is originally used for SR MPLS and SRv6 data plane, allowing it to compute paths to IPv4 and IPv6 prefixes. This draft is well written, however I do have a few comments on the latest version before seeing this work being moved forward:

1. Abstract:
Is regular IPv4 and IPv6 forwarding related to Native IP data plane, 
IP dataplane has been describe once in section 5, but most of other places use IP forwarding, which lack consistency.
2. Introduction, last paragraph:
It looks there are some contradiction here, 
On one hand, Flex algorithm can be used independent of data plane technologies such as SR MPLS, SRv6, Native IPv4/IPv6
On the other hand, it said: Flex algorithm is tied to SR MPLS or SRv6 data plane technology, lack consistency.
3. Section 3
Do we use specific GTP data plane technology in this 5G use case?
If not the case, is there IGP protocol enabled on both gNodeB and UPF? GTP/Native IP/ IP network with IGP protocol support
Please be more explcit in the use case section.
4.Section 6.1: Last Paragraph
Lack RFC reference for IPv4 Prefix Reachability TLV and IPv6 Prefix Reachability TLV.
Why IPv4 prefix reachability TLV can not be used to Carry algo prefix reachability related information?
Suppose both IPv4 prefix reachability TLV and IPv4 Algorithm Prefix reachability TLV can be used to carry the similar information, then the question is when we use IPv4 Prefix Rechability TLV? When we use IPv4 Algorithm Prefix Reachability TLV? Do we over design for this? 
5. Section 6.2: Last two Paragraphs
It looks both ISIS SRv6 locator TLV an ISIS IPv6 algorithm Prefix rechability TLV serve the similar purpose? Why we should introduce ISIS IPv6 Algorithm Rechability TLV?