Research On Recovery Based On SUPANET

Internet was developed for text-oriented network applications in the 1970s, and it requests correctness of contest without real-time requirement. But with increase of multimedia application traffic in Internet, the "best effort" service provided by Internet does not able to satisfy users' different QoS requirements and become one of challenges to Internet. Although the Internet communit attempts to improve the technology in the IP level to improve the quality of service, they are RSVP,Integrated Service,Differentiated Service and etc. But the low efficiency of the existing 3-layers user-data switching platform is difficult to insure the QoS of the service.To solve these problems, Sichuan Network Communication Technology Key Laboratory, Southwest Jiaotong University has defined a new network architecture called SUPA (Single physical layer User-data transfer & switching Platform Architecture). The SUPA simplifies User-data transfer & switching platform (U-platform) into a single physical layer platform by adopting the out-band signaling concept. The key technique enabling the single U-platform is called EPFTS (Ethernet-oriented Physical Frame Timeslot Switching),and guarantee the QoS of the data.SUPA has defined a set of mechanisms both in the S&M-platform and U-platform.In S&M-platform they are QoS Negotiation Protocol (QoSNP), QoS-based lambda Routing Information Protocol (λQoS RIP), Traffic Monitoring & Exchange Protocol (TMEP), Call Admission Control (CAC),and together with the mechanism in U-platform they guarantee the QoS of SUPANET(network supports SUPA). An important component of providing QoS, is the ability to do so reliability and efficiency. To make SUPANET reliable there is need for failure recovery mecasims in SUPANET. The failure recovery mecasim in SUPANET is Protection Switching, which is a method of ensuring recovery from link or node failure without disruption to the data traffic. In Protection Switching, the backup VP is pre-provisioned, when the pximary path is failed ,data traffice is switched from the failed VP to a backup VP.The basic protection switching consists of four steps. First, backup VP must be established. Second, the SUPANET must be able to detect the failure. Third, nodes that detect the failure must notify switching node in the SUPANET of the failure. Forth, instead of sending traffic on the primary VP switching node must send traffic on the backup VP instead.OPNET is used to simulate the protection in SUPANET to validate its availability and efficiency by constituting a simplified SUPA network topology structure while doing fundamental research. The relevant simulation results indicate the validity of protection in SUPA networks which basically complies with the feature of restoration procedure.