3Com 3C13636 Configuration Manual page 863

3Com Router 3000 Ethernet Family
Configuration Guide
Chapter 3 BGP/MPLS VPN Configuration
3.1 BGP/MPLS VPN Overview
Traditional VPN, for which layer 2 tunneling protocol (L2TP, L2F and PPTP, etc.) or
layer 3 tunnel technology (IPSec, GRE and etc.) is adopted, is a great success in such
aspects as solving network security and flexibility and is widely used. However, as the
connecting domain extends, the deficiency of traditional VPN on 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.
MPLS (Multiprotocol Label Switching) technology is fit for VPN networking. With MPLS
network, the IP-based VPN service can be realized easily, thus the requirements for the
expansibility and manageability of VPN are satisfied. In addition, security precautions
can be adopted on MPLS VPN to ensure that no IP connection can be established
between different VPNs and thus VPN security is guaranteed. 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.
V 2.41 provides comparatively complete BGP/MPLS VPN networking capabilities:
Address separation. Allow the address overlapping of the different VPN or
between VPN and public network.
Supporting MP-BGP advertising VPN routing message, establishing BGP/MPLS
VPN.
Forwarding VPN data stream over MPLS LSP.
3Com router provides MPLS VPN performance monitoring and fault detecting
tools.
Chapter 3 BGP/MPLS VPN Configuration
3Com Corporation
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