多标签协议交换（Multi-Protocol Label Switch

Multi-Protocol Label Switching (Multi-Protocol Label Switching, MPLS) is a technology for data packet switching and forwarding through labeling. This technology is an L2/L2/L3 switching technology combined with L3 routing technology L3 integrated data transmission technology. The reason for mentioning "multi-protocol" in MPLS is that MPLS cannot support multiple protocols at the network layer level, such as IPv4, IPv6, IPX, etc., and it is also compatible with multiple link layer technologies. It absorbs the point that ATM tells the switch, and introduces connection-oriented control technology, which first implements the third layer routing function at the edge of the network, and uses the second layer switch in the core layer. <br>MPLS combines the advantages of Layer 2 and Layer 3 technologies. Through label forwarding, connection-oriented IP networks have connection-oriented attributes. Therefore, the main function of MPLS is now to combine Layer 2 switching and Layer 3 routing technology, establish end-to-end pipes through labels, and provide IP bearers.

Multi-Label Protocol Switching (MPLS) is a labeling technology for packet exchange and forwarding, a L2/L3 integrated data transmission technology that combines the second layer switching technology with the third layer routing technology. The "multi-protocol" is mentioned in MPLS because MPLS does not support protocols at multiple network levels, such as IPv4, IPv6, IPX, etc., and is compatible with a variety of link layer technologies. It absorbs the atM to tell the switch ingest editing a bit, and introduces connection-oriented control technology, first implementing the third-tier routing function at the edge of the network, and using the second layer switching in the core layer. <br>MPLS combines the benefits of two- and three-tier technology to give connection-oriented IP networks connections through label forwarding. So MPLS is now primarily functional in combining two-tier switching and three-tier routing technology to establish an end-to-end pipeline through labels to provide IP hosting.

Multi protocol label switching (MPLS) is a technology of packet switching and forwarding by label. It is a L2 / L3 integrated data transmission technology which combines the second layer switching technology and the third layer routing technology. The reason why "multi protocol" is mentioned in MPLS is that MPLS can not support multiple network layer protocols, such as IPv4, IPv6, IPX, etc., and can also be compatible with multiple link layer technologies. It absorbs the advantages of ATM tell switch and introduces connection oriented control technology. At the edge of the network, the third layer routing function is implemented first, while at the core layer, the second layer switch is used.<br>MPLS combines the advantages of two-tier and three-tier technologies. Through label forwarding, the connectionless IP network has the attribute of connection oriented. Therefore, the main function of MPLS now is to combine layer 2 switching and layer 3 routing technology, establish end-to-end pipeline through label, and provide IP Bearer<br>