| The serious technology task and urgent project problem is how to support packet-services efficiently and intelligently in metro network. This dissertation bases on Metro-Ethernet-Forum Ethernet services, brings out a solution to solve this actual problem.This paper begins with analyzing current metro transport network. Combined with Ethernet work technologies, an innovative scheme has been proposed to solve transporting packet-service on metro transport network. In this scheme, the key technology is using Stackable VLAN to establish metro Ethernet EVC, and using 'self-limited' protocols to manage layered metro Ethernet network. This scheme gets over several severe shortcomings in other schemes, just like poor scalability in network design, low usage in network bandwidth utilization, etc.To implement this scheme, we designed hardware platform with powerful network processor IXP1200. Upon this platform, we designed software architecture, microcode data structure, and microcode process flows. After debugging, we take a carefully system test, and the results conform the design, and meet the requirements of real network applications.At last, we figures out several typical networking applications.
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