SDN (Software Defined Network)-based method for implementing constrained path-based data forwarding in IP network

Abstract

The invention discloses an SDN (Software Defined Network)-based method for implementing constrained path-based data forwarding in an IP network. The method includes the following steps that: an acceleration service planning table is formulated according to service traffic; the acceleration service planning table is decomposed, and configurations are distributed to exit gateways and acceleration nodes; an exit gateway packets data streams, rewrites the outer layer destination IP and VNI (Virtual Network Identifier) information of a VXLAN into the IP and path index of the acceleration nodes, andthen guide the rewritten information to an exit acceleration node; the acceleration node extracts and restores the VNI information so as to guide the forwarding of the data streams; and a destinationgateway parses an VXLAN message and forwards the data streams to a correct tenant network. According to the method of the invention, the characteristics of an SDN are fully utilized; the VNI information in the VXLAN header is ingeniously utilized, so that constrained path-based traffic forwarding can be realized in the pure IP network. The method has the advantages of novelty, simplicity, high efficiency and the like.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for realizing constrained path forwarding in an SDN-based IP network. Background technique [0002] With the development of SDN (Software Defined Network) and NFV (Network Function Virtualization, Network Function Virtualization) technologies, virtualized data center technology has attracted widespread attention in the industry, and various application scenarios emerge in endlessly. [0003] Such as figure 1 A typical application scenario is shown. The three-layer interconnection between two multi-tenant physical data centers is realized through the IP bearer network. On the premise of introducing SDN controller and network orchestrator, VXLAN (Virtual eXtensible LANs) tunnel, so as to realize the large-scale two-layer interconnection based on IP bearer network, and its effect is similar to MPLS VPN technology. By making reasonable use of the VXLAN tunnel-based...

AI Technical Summary

Problems solved by technology

However, since the VXLAN tunnel between the two gateways is dynamically learned through the BGP control plane, the acceleration node does not act as a BGP site and does not learn VXLAN tunnel information, and only performs data forwarding through a simple forwarding rule table

The traffic of different tenants is encapsulated by VXLAN through the gateway and becomes an ordinary UDP packet, which is uniquely determined by the outer source IP, destination IP, and VNI information in the VXLAN header. It is impossible to allow specific UDP packets to pass through the fixed Accelerate the private network to the destination gateway, that is, it is impossible to achieve efficient forwarding of data based on constrained paths in a pure IP network

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