Date Added: May 2012
Network operators are migrating to a multi-layer architecture with IP/MPLS equipment and optical nodes. Thanks to the advent of reconfigurable optical equipment and a multilayer control plane, current 1+1 node protection at the IP layer in each location is not required anymore. This work studies the network availability in a national network with current 1+1 protection. To do so, an analytical expression is derived and validated via simulation in a typical operator scenario. With these results, this work concludes that it is possible to reduce the network equipment while maintaining the service availability currently offered to the clients.