Previous post has already covered why segment routing is required with all it's basic information. This post is mainly focusing on difference between SR Based MPLS Networks Vs Classic MPLS Networks.
| Segment Routing Based MPLS | Classic MPLS | |
|---|---|---|
| MPLS Transport | IGP | IGP + LDP |
| IGP/LDP synchronization | Not Required | Required and Added More Latecny in Convergence |
| 50msec FRR | IGP | IGP + RSVP-TE |
| Extra TE states to support FRR | No extra state | Extra states to manage |
| Optimum backup path | Yes | No |
| ECMP-capability for TE | Inbuilt | No |
| TE state only at headend | Yes | No (n^2 problem at midpoint) |
| Seamless Interworking with classic MPLS | Yes | NA |
| SDN Support | Yes | No |
| Routing | Constraint Based (Source can Define) | Destination Based + RSVP-TE |
| Link information | (Bandwidth, IGP metric, TE metric, SRLG ) is flooded throughout the IGP domain | No |
| Path Calculation | CSPF or By Using Centralized Controller | IGP + RSVP-TE |
| Scalability | High | Low |
| Operations and Troubleshooting | Low | High |
2 comments:
Great post!!
Are there any service providers who are using Segment Routing in their Live/Production Network. Are there any know challenges/limitations going with this.
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