Hi Dear author, I'm assigned to review draft-ietf-mpls-spring-lsp-ping-path-sid-06 by OPSDir.

General status: Has Nits
This document is a concrete proposal of defining PSID FEC sub TLVs for LSP Ping. The content and node behavior of the sub-TLVs is well specified in details. No problems found in tehchnical perspective.

The Nit:
I've been a bit confusing of what is the usage of the newly defined TLVs when firstly read the draft. Then I found it might be mainly for verification of the conformance between the control plane and the data plane for a given FEC, based on some texts "hidden" in the sub-TLV definition section. (And yet, not very sure whether there might be other usage.)
I'd suggest to add some background/scenarios description in Section 1 and also summarize it in the abstract. I believe it would be very helpful to navigate the readers who don't know the bachground of this work.

B.R.
Bing