Method, device and system for down sending route

Abstract

The invention is designed for use in solving the issue existed in currently-used technology that is the capacity expansion of router is limited by globally sending down the forwarding information table. The method comprises: according to the routing information, generating the forwarding information table; according to the route filter strategy corresponding to each interface board, making the route filter for the forwarding information, and sending the filtered route information to the relay engine.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method, device and system for delivering routes. Background technique [0002] When a router forwards a data packet, it usually searches the Forwarding Information Base (FIB, Forwarding Information Base) table, and finds the shortest path through the longest match between the routing prefix and the mask to guide the IP packet forwarded from a physical port to the next-hop router. FIB The table includes public network routes and virtual private network VPN (Virtual Private Network) routes, which are stored in the forwarding engine uniformly. [0003] In the prior art, the FIB of the public network routing and VPN forwarding information base is global, and all VPN routes are delivered to all interface boards; however, with the increasing scale of IP networks and the MPLS (Multi-Protocol Label Switching) layer 3(L3) With the growth of VPN services, the routing capacity conti...

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Problems solved by technology

[0003] In the prior art, the FIB of the public network routing and VPN forwarding information base is global, and all VPN routes are delivered to all interface boards; however, with the increasing scale of IP networks and the MPLS (Multi-Protocol Label Switching) layer 3(L3) With the growth of VPN services, the routing capacity continues to increase. The forwarding engine of the router device is facing a huge challenge of large-capacity routing. The global distribution of all routes to all interface boards will inevitably result in redundant routing to the interface board. Large-capacity routing needs to consume more fast memory, which limits the expansion of router routing capacity, and also affects forwarding performance with the growth of lookup table entries

[0004] Because the routing capacity of the interface board of some routers is small, it cannot accommodate all the global FIBs. In this case, the routes exceeding the capacity of the interface board are discarded and sent to the main control board for table lookup and forwarding; the characteristics of this method are The forwarding efficiency is low, and the device is relatively vulnerable to attacks. If all the packets found in the FIB table of the interface board are sent to the main control board for table lookup and forwarding, it will have a great impact on system performance, especially for high-speed forwarding routers. Big

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