Hi,

I am the assigned Ops reviewer to conduct the "early" review of this draft. This is my second review.

Thanks for addressing my previous comments. I have few minor comments on rev-19:

1)Abstract and Section 3. Architecture Overview
Abstract says “overlay routes”, but section 3 uses “service routes”. Can the service route be used consistently? If not, can you add the difference?


2) 3. Architecture Overview
Please add the description or examples of SN for Figure 1.

3) 4. Transport Class
The document says "The terms'Transport Class ID' and'Color' are used interchangeably in this document"

These two seem two different definitions, as section 7.10. has the following text:
"Transport Class ID SubTLV, in MultiNexthop Attribute.
Color SubTLV, in Tunnel Encapsulation Attribute.
Transport Target Extended community, on BGP CT route.
Color Extended community, on BGP service route."


4) 10. Operations and Manageability Considerations
Only RDs and labels are discussed. Should transport class RT managment also be described in this section?

5) 12. Applicability to Network Slicing
Network slice is just an example of BGP CT. Should this section be an appendix?
About Mapping Community, Network Slice service traffic mapping occurs on the PE's CE-facing interfaces, while Mapping community is on the PE's network-facing interfaces, correct?