MPLS LDP Basic Concepts

Lets talk about the MPLS LDP Basics in our today's article

Multiprotocol Label Switching (MPLS)
In order to increase forwarding speed, Multiprotocol Label Switching (MPLS), which has its roots in IPv4, was first suggested. Several network protocols, including IPv6, Internet Packet Exchange (IPX), and Connectionless Network Protocol, can be added to its fundamental technology (CLNP). The phrase "multiprotocol" refers to this.

Layer 2 fast switching and Layer 3 routing and forwarding are both integrated in MPLS, which satisfies the networking needs of several innovative applications.

LDP Basic Concepts
The messages to be utilized in label distribution and associated procedures are prescribed by an LDP.

Fig 1.1- MPLS Network

Through the use of LDP, LSRs may directly map network layer routing information to data layer switching pathways and create LSPs. Label switching is feasible at all transit nodes on the network thanks to LSPs that may be formed between nearby LSRs and LSRs that are not directly linked.

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LDP session
Label binding and label releasing messages are exchanged during LDP sessions.

• Local LDP session: Created between two LSRs that are physically linked.
• A remote LDP session is established between two LSRs that are indirectly linked.

LDP peer
LDP peers are two LSRs that have formed an LDP session between them and are exchanging label to FEC bindings via LDP. Each LDP peer receives the label to FEC bindings of its peer over the LDP session between them.

LDP message type
LDP messages are classified into four categories.

• Discovery message: Used to declare and maintain an LSR's existence on a network
• Session message: Used between LDP peers to start, maintain, and terminate sessions.
• Advertisement message: This message is used to create, modify, or remove label to FEC bindings.
• Notification message: Used to offer advice and notify faults.