Survivable Traffic Grooming Research Report CSC 791b: Survivable Networks

Recent advances in optical communications have increased the bandwidth of individual wavelengths and the number of wavelengths carried per fiber by a substantial amount. The increase in traffic demands has however failed to keep pace with this phenomenon resulting in a number of sub-wavelength demands. These sub-wavelength demands need to be allocated one wavelength resulting in wastage of residual wavelength capacity. Traffic grooming aims to aggregate these low capacity demands onto high capacity wavelengths aiming to improve the bandwidth utilization Survivable traffic grooming aims to provide reliable and resource efficient subwavelength-granularity connection services in optical networks. In this survey, we give an overview of the research done in survivable traffic grooming. We focus on the protections mechanisms for traffic grooming. We describe schemes for dynamic traffic like protection at lightpath (PAL) and protection at connection (PAC). We also describe some algorithms developed to address the static survivable traffic grooming problem under Shared Risk Link Groups constraints. We briefly mention abut another emerging research area, survivability in waveband switching.