RSVP-TE Signaling Recovery with Graceful Restart in UNI

RSVP was proposed as a standard signaling protocol and has been widely implemented in IP networks. It has been extended to support MPLS and GMPLS networks with traffic engineering extensions. OIF UNI signaling re-uses the existing GMPLS RSVP- TE between clients, e.g, IP, ATM, and SONET/SDH devices, which are connected to the transport network for requesting and establishing dynamic connectivity. In automatic switched transport networks, the control plane is separated from the data plane and responsible for routing and signaling handling, and the data plane is for forwarding lots of data. Therefore, the failure of the signaling should not impact the established forwarding plane. The current mechanisms proposed in RFCs do not fully support signaling state recovery on the client router. This paper proposed a new approach to recover the signaling state on the source client router in UNI. It is proved to be simple and efficient in our UNI testbed. Moreover, this scheme could be also adapted in any kinds of nodes in GMPLS networks.