Fault-tolerant path teardown signalling for broken-link resource collection

Abstract

Efficient resource usage is an essential part in service availability, because more usable spare resources mean more space for restoration. Temporary outages in the control plane may represent a cause of waste of resource, if during a path deletion procedure the signal flow is interrupted and some nodes may fail to receive the proper resource release commands. This paper presents a "safe deletion" procedure to preserve efficiency in resource usage even in presence of temporary node isolation. Index Terms control plane, signalling protocol, resource usage, service availability.