Achieving IP routing stability with optical bypass

The evolution of next generation services has led to significant increase in Internet backbone traffic, and multi-layer (hybrid) IP over circuit/optical layer solutions are being explored to cope up with the growing demands for capacity. Optical circuit bypass is typically used to increase capacity in the IP layer without need for over-provisioning, which in turn reduces OPEX of the IP network. Current proposals for IP topology reconfigurations in multi-layer networks do not take into consideration the effect of modifying the network topology on routing stability. We present a new bypass-based IP topology upgrade mechanism which can be used with high frequency without significantly affecting routing in the network. We present an ILP based approach to compute the optimal bypasses in the IP layer in case of congestion and numerical results show that our proposed solution is scalable and efficient.