Distributed Disaggregated Backbone Router - P-Router & Internet Gateway (DDBR P & IGW)

The purpose of these documents is to describe a set of technical requirements and recommendations for:

1. A shift in the IP backbone architecture from monolithic chassis-based, to a disaggregated Spine & Leaf architecture

2. Describes the technical aspects of a Distributed Disaggregated Backbone Routers (DDBR) which is a versatile architecture that can be deployed in IP core/backbone networks, to fullfil different IP transport use cases (P, PE, Internal-gateway).