Method and system for realizing hot backup in centralized network nodes

Abstract

The invention discloses a method and system for realizing hot backup in a centralized network node. A main control module and a backup control module are arranged in the network node; an RSVP-TE tunnel is established for service, wherein the RSVP-TE tunnel contains two label switched paths (LSPs), one is a main LSP, and the other is a backup LSP. The method comprises the following steps: the main control module obtains the control information of the main LSP and backup LSP and sets the identification information of the control information of the main LSP and backup LSP to be active or inactive according to the current states of the main LSP and backup LSP; the control information of the main LSP and backup LSP is updated to the backup control module; and after the main control module and the backup control module are switched, the current main control module generates forward information according to the control information of the LSP of which identification information is active and performs service forwarding. The invention also discloses a system for realizing the method. By using the method and system of the invention, the switching and forwarding time is reduced and the service forwarding speed is increased.

Description

technical field [0001] The present invention relates to the hot backup technology of Resource Reservation Protocol-Traffic Engineering (RSVP-TE, Resource Reservation Protocol-Traffic Engineering) service based on traffic engineering extension, in particular to a method and system for realizing hot backup in a centralized network node. Background technique [0002] As a supplementary protocol of Resource Reservation Protocol (RSVP, Resource Reservation Protocol), RSVP-TE is used to establish a label switching path for a Multi-Protocol Label Switching Protocol (MPLS, Multi-Protocol Label Switching) network. RSVP-TE is mainly used to support an instance of explicitly transmitting a Label Switched Path (LSP, Label Switched Path) with or without resource reservation. [0003] Hot backup (TE HOTSTANDBY) is an end-to-end protection mechanism for RSVP-TE tunnels. Corresponding to an RSVP-TE tunnel (TUNNEL), two LSPs will be formed, namely the active LSP and the backup LSP. When th...

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Problems solved by technology

Figure 4 It is a schematic diagram of the centralized network node structure, such as Figure 4 As shown, the centralized network node implements the functions of the main control processing unit (MPU, Management Processor Unit), routing processing unit (RPU, Routing Processor Unit), and NPC on the same CPU. Therefore, compared with distributed equipment The cost is low, and the overall software complexity is also low, but due to the characteristics of its single CPU work, the separation of control and forwarding cannot be achieved during hot backup

[0007] However, since the control information and forwarding information are concentrated in the same CPU, how to realize the hot backup in the current centralized network nodes, there is no related technical solution at present

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