3Com Switch 8800 Configuration Guide Chapter 37 BGP/MPLS VPN Configuration37-1Chapter 37 BGP/MPLS VPN Configuration37.1 BGP/MPLS VPN OverviewTraditional 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 successand is therefore widely used. However, along with the increase of the size of VPNs , thedeficiency of traditional VPN in such aspects as expansibility and manageabilitybecomes more and more obvious. In addition, QoS (Quality of Service) and securityare also the difficult problem for traditional VPN.Using the MPLS technology, service providers can implement the IP-based VPNservices easily and enable their networks to meet the expansibility and manageabilityrequirement for VPN. The VPN constructed by using MPLS also provides the possibilityfor the implementation of value-added service. Multiple VPNs can be formed from asingle access point, and each VPN represents a different service, making the networkable to transmit services of different types in a flexible way.Product currently provides comparatively complete BGP/MPLS VPN networkingcapabilities:z Address isolation, allowing the overlap of address of different VPNs and publicnetworks.z Supporting MBGP advertising VPN routing information through public network,establishing BGP/MPLS VPN.z Forwarding VPN data stream over MPLS LSP.z Providing MPLS VPN performance monitoring and fault detecting tools.
