HP Intelligent Management Center Licenses - Manual (Page 34)

In the basic structure of an MPLS-based VPN a CE (Customer Edge) can be a router, switch,
or host. All PEs (Provider Edge) are on the backbone network. PE is responsible for managing
VPN users, establishing LSP connections between PEs, and allocating routes among different
branches of the same VPN.
2. MPLS-based TE
TE can make best utilization of network resources and avoid non-even load distribution by real-time
monitoring traffic and traffic load on each network elements to dynamically tune traffic management
attributes, routing parameters and resources constraints.
MPLS TE combines the MPLS technology and traffic engineering. It reserves resources by establishing
LSP tunnels to specific destinations. This allows traffic to bypass congested nodes to achieve
appropriate load distribution. With MPLS TE, a network administrator can eliminate network
congestion simply by creating some LSPs and congestion bypass nodes. Special offline tools are
also available for the traffic analysis performed when the number of LSPs is large.
Basic Concepts of BGP/MPLS VPN
BGP/MPLS VPN is a kind of PE-based L3VPN technology for service provider VPN solutions. It
uses BGP to advertise VPN routes and uses MPLS to forward VPN packets on service provider
backbones. MPLS L3VPN provides flexible networking modes, excellent scalability, and convenient
support for MPLS QoS and MPLS TE. Hence, it is widely used. The MPLS L3VPN model consists of
three kinds of devices: CE, PE and P. The following figure is a diagram for BGP/MPLS VPN
networking:
34 MPLS Manager