3com 8807 Guia Do Utilizador

Traditional VPN, for which layer 2 tunneling protocols (L2TP, L2F and PPTP, and so 
on.) or layer 3 tunnel technology (IPSec, GRE and so on.) is adopted, is a great 
success and is therefore widely used. However, along with the increase of the size 
of VPNs , the deficiency of traditional VPN in such aspects as expansibility and 
manageability becomes more and more obvious. In addition, QoS (Quality of 
Service) and security are also the difficult problem for traditional VPN.

Using the MPLS technology, service providers can implement the IP-based VPN 
services easily and enable their networks to meet the expansibility and 
manageability requirement for VPN. The VPN constructed by using MPLS also 
provides the possibility for the implementation of value-added service. Multiple 
VPNs can be formed from a single access point, and each VPN represents a 
different service, making the network able to transmit services of different types in 
a flexible way.

Product currently provides comparatively complete BGP/MPLS VPN networking 
capabilities:

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Address isolation, allowing the overlap of address of different VPNs and public 
networks.

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Supporting MBGP advertising VPN routing information through public 
network, establishing BGP/MPLS VPN.

■

Forwarding VPN data stream over MPLS LSP.

■

Providing MPLS VPN performance monitoring and fault detecting tools.