Here’s a short primer on Segment Routing from our CTO Cengiz Alaettinoglu. This is the 13-minute presentation he gave as part of the Segment Routing Panel at APRICOT in Vietnam last month (You may view his slides at the link also). He starts by explaining various scenarios that show why forwarding traffic over non-shortest paths is important, such as traffic engineering, congestion, failures, premium services (service providers allocating specific paths to certain customers), etc.
He then describes the two choices network operators have to route traffic over non-shortest paths: RSVP-TE and Segment Routing. Segment Routing is the superior choice according to Cengiz, because it is simpler. In fact, many service providers are reluctant to run RSVP-TE because of the overhead and other issues.
He also presents two use cases for Segment Routing. The first is an SDN Traffic Engineering use case. One of the reasons for Segment Routing’s increasing popularity is its ability to facilitate SDN traffic engineering. The second is topology-independent loop-free alternative (TI-LFA), which protects against link, node, and SRLG failures, and also protects any MPLS traffic.
Finally, Cengiz addresses some of the operational challenges of deploying Segment Routing. Check out the video and let us know what you think!
For more information about Segment Routing, see http://www.packetdesign.com/blog/mpls-traffic-engineering-segment-routing/