Mpls-based Atm Switches

In this article, MPLS is realized in ATM switchs in order to support IP traffic.Functional module division of MPLS and relations among the modules are analyzed, the realization of MPLS controlling module is also presented. Deep analyzing for LDP' s functioning mechanism is brought out, CR-LDP' s expansion function for LDP and its principle for supporting traffic scheduling. Then MPLS network based on ATM is studied in detail, parameters and their meanings for MPLS over ATM is described, realization method of MPLS over ATM is presented.LDP, the core of MPLS controlling module, is appropriately used for c(?)eating and maintaining MPLS node' s label FEC binding in MPLS network. LDP is a complex signaling protocol with comprehensive functionalities. As for ATM switchs, complete realization of LDP is of few significance, also project schedule does not permit this. In this article, based on deep analyzing for LDP, MPLS function set necessary for realizing is summed up and LDP/CR-LDP for ATM switching is designed according to customer requirements and characteristic of ATM switchs. Since the forwarding of labeled packet is realizing by SVC switching of ATM switchs and the forwarding table is stored in hardware of ATM switchs, emphasis of this article is the realization for LDP/CR-LDP based on ATM switchs, including LDP, label resource, and management of label information database. LDP is over TCP and UDP, so Socket programming technology is adopted. In order to forward TCP and UDP packet carrying protocol information, it is necessary to separate these TCP and UDP packet, which is provided by realizing END(Enhanced Network Driver) of VxWorks.Following is the content:1, Based on multitask real-time operating system of VxWorks, LDP...