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Basics of Multiprotocol Label Switching Networking
Published in Stephan S. Jones, Ronald J. Kovac, Frank M. Groom, Introduction to COMMUNICATIONS TECHNOLOGIES, 2015
Stephan S. Jones, Ronald J. Kovac, Frank M. Groom
A number of terms describing devices employed in an MPLS network need to be defined, and a few of the mechanisms used have to be described before we discuss MPLS functions. We will need a few of these definitions to proceed. Among these components are the following: Customer edge router (CER): The customer’s router at the edge of the customer’s network that submits both requests for MPLS paths (and labels) and frames and packets for subsequent labeling and forwarding over the MPLS network.MPLS label: A header placed in the address field between the layer 2 and layer 3 addresses that is used by the MPLS routers in the network to switch/route the frames and packets.Label edge router (LER): The router at the entry point to the MPLS network. This router receives customer request messages, applies an appropriate label to indicate the path that provided that transmission quality, and advertises that that label and path have been subscribed to.LSR: A router within the MPLS network that switches/routes that message on the basis of the MPLS label that has been inserted between the level 2 and level 3 addresses.FEC: An FEC identifies a particular traffic flow along a path through the network. That preassigned path is designated an LSP through the network, and each FEC class is assigned to a particular LSP path. All customers whose packets are assigned to a particular FEC class have their traffic flow along the same prearranged LSP path.LSP: A chain of labels that, in sequence, are applied to the message as it is forwarded from one router to the next along the designated path associated with the required bandwidth and service quality.Label Distribution Protocol (LDP): The protocol employed by the entry LER to notify the downstream routers that a certain pathway has been allocated and that they should place labels in messages passing through along that pathway.Label Information Base (LIB): The base of information about a set of labels defining a chosen path that is forwarded to the LSRs along the chosen path.
A Survey on Packet Switching Networks
Published in IETE Journal of Research, 2022
Furthermore, the MPLS technology has its terminologies, which help understand the working of this technology. These terminologies have vital roles to play in the working process of MPLS technology. The MPLS domain is the most common terminology, which means the continuous set of nodes that operate MPLS technology. The routers in the MPLS network are given different names like Provider (P), Provider Edge (PE), and Customer Edge (CE). The router located at the edge and connected to the customer edge is called the Provider edge router, while the customer routers directly connected to the PE are called the Customer edge router. All other routers in the MPLS domain are called Providers.