Hello, 

I have been selected as the Routing Directorate reviewer for this draft. The 
Routing Directorate seeks to review all routing or routing-related drafts as 
they pass through IETF last call and IESG review, and sometimes on special 
request. The purpose of the review is to provide assistance to the Routing ADs. 
For more information about the Routing Directorate, please see 
​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir 

Although these comments are primarily for the use of the Routing ADs, it would 
be helpful if you could consider them along with any other IETF Last Call 
comments that you receive, and strive to resolve them through discussion or by 
updating the draft. 

 Document: draft-ietf-spring-segment-routing-ldp-interop-11 
 Reviewer: Tomonori Takeda 
 Review Date: May 26th, 2018
 IETF LC End Date: Not known 
 Intended Status: Standards Track

Summary:
This document is basically ready for publication, but has nits that should be 
considered prior to publication.

Major Issues:
None

Minor Issues:
I am a little bit confused about the relationship of SR/LDP interworking and 
migration from LDP to SR.

The document says:
 
   "This document outlines the mechanisms through which SR interworks
   with LDP in cases where a mix of SR-capable and non-SR-capable
   routers co- exist within the same network and more precisely in the
   same routing domain."

My understanding of SR/LDP interworking and migration from LDP to SR is a 
different story.
Migration from LDP to SR may or may not use SR/LDP interworking.

Section 3 described migration from LDP to SR, but this migration scenario does 
not use 
SR/LDP interworking (expect for SR-based FRR usage to protect LDP traffic).
This migration scenario uses SR/LDP co-existence, though.

Is section 3 for information purpose only?

Nits:
None


Thanks,
Tomonori Takeda

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