Analysis of RSVP-TE Graceful Restart

GMPLS is viewed as an attractive intelligent control plane for different network technologies and graceful restart is a key technique to ensure this control plane is resilient and able to recover adequately from faults. This paper analysis the graceful restart mechanism proposed for a key GMPLS protocol, RSVPTE. A novel analytical model, which may be readily adapted to study other protocols, is developed. This model allows the efficacy of graceful restart to be evaluated in a number of scenarios. It is found that, unsurprisingly, increasing control message loss and increasing the number of data plane connections both increased the time to complete recovery.