1. Native FEC simulation for UDP
Matthew Brindley
Elbert Wang

2. Problem Statement Internet traffic increasing rapidly
Core networks scaled to terabits-per-second and increasing
Current routers have the following problems:
Delay and jitter,
high cost,
power consumption and
heat dissipation
All-optical packet switched routers
Examples:
IRIS
Lasor
Difficult to employ integrated optical buffers
Challenge:
Reliability of packet traffic with near zero buffer in core link.
A potential solution:
Edge to edge based packet level “Forward Error Correction” (FEC)

3. Work undertaken
Native simulation of UDP data flow under near zero core buffer conditions
Dumbbell topology
Single core link
Multiple edge routers
Multiple End-hosts per edge router
Forward Error Correction
Feedback less
Image source: On the Efficacy of Edge-to-Edge Packet-Level FEC in Near-Zero Buffer Core Networks p.4 – Vishwanath, A, Sivaraman, V, Thottan, M, Dovrolis, C

4. Approach Simulation in C Discretised time
Random packet generation at each client
Packet generation using random exponential distribution size
FEC counter

5. Limitations Native simulation Granularity
Discrete time
Adjustable tick per microsecond
‘All-knowing’ loss tracking elements rather than a robust packet sequence checking system

6. Initial Results

7. Conclusions
Initially with FEC block size increase % loss reduction improves
As FEC block size continues to increase, % loss increases
The best % loss reduction at FEC block size 3

8. Thank you for your time. Questions?
Open Floor
Thank you for your time. Questions?