Benefits of segment Routing

Benefits of segment Routing are as follows:-

1. SDN ready

      a) Foundation for Application engineered routing( AER)

      b) Can provide strict performance guarantees

      c) Efficient use of network resources

      d) Router can inject traffic with the segment list without any additional need of signaling protocol in the network.

2. Simplified
        a) Simple operation without any separate protocols like LDP and RSVP.
        b) No complex LDP or IGP synchronization issues to troubleshoot.

3. Support Fast rerouting
a) Convergence time in sub seconds (50msec)

4. Scalable
a) Due to simplified behavior
        b) Avoid thousands of labels in LDP database unlike MPLS
c) Avoid thousands of TE LSP’s
d) Avoid complex configuration of TE(traffic Engineering)

5. Efficient 
a) Support ECMP (equal cost multipath)
b) Better utilization of installed infrastructure

6. Plug and Play
a) Segment routing is inter operatable with existing MPLS control and dataplanes. 
b) It can be implemented in existing MPLS deployment.

7. Centralized TE
a) Controllers and orchestration platform can interact with segment routing to optimize the TE centrally.
        b) Network changes such as congestion can trigger an application to optimize the placement of segment routing traffic engineering tunnels and will re route the traffic to path with available bandwidth.