| Based on the practical needs in construction of Sichuan Unicom network, the authormade a deep research work on the technology of big-scale network, the VPN structure,design and realization solutions, as well as how to satisfy the operator's the VPNservice need with MPLS VPN technology.For some equipment in the regional network being incompatible to MPLS, the authorworks out a comprehensive design by adopting both VLAN and MPLS to realize VPNservices, which also includes the use of VLAN-MPLS VPN-VLAN structure inend-to-end VPN service.Moreover, the author probes into the field of IP MAN network and discusses thequestions like how to guarantee the VPN users' data transferring security and networkservice, all of which are provided with possible solutions accordingly.Beyond the theoretical and technological research, the author took part in SichuanUnicorn's IP Broad-band Comprehensive Network construction. He successfullydesigned the general layout of network, worked out the application of the routingprotocol, and realized VPN network design and implementation.
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