COMMUNICATION SYSTEM, DEVICE, ROUTE SWITCHING METHOD AND LABEL ISSUED STATE NOTIFYING METHOD

摘要

A communication system, label switched router, network device, route switching method and label issued state notifying method. The route switching method includes: creating the Liberal LSP between upside LSR and lower LSR; confirming that the Liberal LSP is created; transmitting the switching notice to upside LSR, which processes route switching according to the switching notice. The method can improve the accurate opportunity of route switching to avoid interrupting of label forwarding and reduce the influence to the convergence time of route switching.