MPLS- ××× (Multi-Protocol Label Virtual Private Network)

1. MPLS - *** Overview:

MPLS - *** is based on MPLS (Multiprotocol Label Switching) technology ip - *** *** is the application of MPLS forwarding packets over the backbone network service providers on the network device, MPLS- ××× Network flexible manner, good scalability and can support MPLS Qos, as has been widely used.

2. Two traditional ×××.
   Causes 1. Traditional ××× generated:
   Simply say is to realize connecting corporate headquarters and division, but the solution to communicate more than ××× one of in addition to Internet , dedicated line , but Internet , relatively speaking, very safe, green price is very expensive, so there ××× technology. Early on, in order to achieve connections between headquarters and the branches, with a shared technology (Frame Relay or X.25) corresponds dedicated tunnel, sites communicate through the tunnel.

   2. ××× of two characteristics:
   1. communicate across the public network to the private network. 2. Isolation between private network

   3. ××× traditional network architecture:
   the CE (customer network edge devices): the operator and the customer equipment directly connected.
   PE (Provider Edge equipment): the operator and the client devices directly connected.
   P (operator core device): internal operator equipment.
   Site (Site): a set of systems with IP connectivity, communication without going through the operator.

   4. Traditional ××× model:
   .overlay ***:
   

   .peer to peer ××× (point ×××):
   

3. MPLS-×××：

   The reason 1.MPLS- ××× generated:
   The reason is to solve the private network address can not distinguish between the question:
   

   2. ××× example:
   ××× routing table is VRF (virtual routing and forwarding table)

   3.RD ID:
   

   4.RT identifier (routing tag):
   

   5.MP-BGP: PE and PE transmitting multi-protocol routing BGP. ××× v4 role is to transfer route.

   6. Label Forwarding:
   

   7. test case design: