VPN attribute management: manages attributes of multiple VPNs on PE devices and differentiates VPN address spaces.VPN tunnels: includes establishment and management of tunnels.The VPN architecture contains the following parts: Establishment of network connections between users, including construction of the internal topology of a VPN, route calculation, and management of users joining in or leaving the site, is necessary for implementing VPN. As an upper-layer service, VPN is more complex than P2P applications.
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