Method and apparatus for distributing label

Abstract

The invention discloses a method for label distribution, comprising the following steps: a label is allocated for each operator edge router in a network, wherein labels allocated for any two operator edge routers are different; and through an inner gateway protocol, the corresponding relation of the label of each operator edge router and a loopback address is notified to each operator edge router and an operator core router. Meanwhile, the invention discloses a label processing method, a label distribution device and a label processing device. The method can realize label distribution without adopting dynamic label distribution protocols such as LDP.

Description

Technical field [0001] The present invention relates to the field of computer and communication technology, and in particular to a label distribution method and device. Background technique [0002] Multi-Protocol Label Switching (MPLS) technology is a L2 / L3 integrated data transmission technology that combines Layer 2 switching and Layer 3 routing. It not only supports multiple protocols at the network layer, but is also compatible with multiple link layer technologies on the second layer. . IP routers and ATM and FR switches using MPLS technology are collectively referred to as label switching routers (LSR). The network using LSR simplifies the complexity of the network layer, is compatible with existing mainstream network technologies, and reduces the cost of network upgrades. [0003] In the MPLS network, data packets at the ingress LSR are divided into different forwarding equivalence classes (FEC) according to different forwarding requirements, and each specific FEC is mapp...

AI Technical Summary

Problems solved by technology

[0008] 1. There is an N-square problem in the LSP entries of LDP: there are N PE routers and M P routers. If the routes are evenly distributed, the LSP entries of each P router=N*(N-1) / M, and N= 1000, M=10, then LSP entries=100K, there is a certain problem in scalability

At the same time, too many LSP entries will also lead to a longer process of matching the label table, consuming more memory and CPU resources of the P router.

[0009] 2. There are outgoing labels and incoming labels, so the P router has a label switching process in addition to the label matching process, which wastes processing time and memory space.

[0010] 3. Enabling dynamic label distribution protocols such as LDP to distribute inspection labels requires protocol overhead and increases failure points

And, because the convergence of LDP lags behind the convergence of IGP, it will increase the network convergence time

In addition, because LDP needs to cooperate with IGP, it will increase the complexity of the system

Images