Building the Network of the Future

13Network Core

John Paggi

Contents

13.1Optical Layer

13.1.1Optical Technologies

13.1.2Flexible Software-Controlled Optical Networks

13.1.3Open ROADMs

13.1.4Future Work in the Optical Layer

13.2MPLS Packet Layer

13.2.1IP Common Backbone

13.2.2Evolution of MPLS

13.2.2.1Basic MPLS Transport

13.2.2.2Fast Reroute and Hitless Rearrangements

13.2.2.3Distributed Traffic Engineering: Bandwidth Aware Routing

13.2.3Segment Routing

13.2.3.1Packet Forwarding under Normal Conditions

13.2.3.2Explicit Routing

13.2.3.3Faster Restoration Using Segment Routing

13.2.3.4Segment Routing Benefits

13.2.3.5Segment Routing versus RSVP-TE

13.2.4Core Router Technology Evolution

13.2.5Route Reflection

13.3SDN Control of the Packet/Optical Core

13.3.1Centralized TE