Compared with the MPLS L2VPN technology, the traditional L2VPN (ATM and FR) has the following disadvantages: a. Because OC-192c/STM-64 is not supported, they are not fast enough. b. The VPN is limited to a single medium, and the networking mode is not flexible. c. Complex configuration, difficult maintenance, and poor scalability. d. The security and confidentiality are poor.
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