Method and device for announcing route to EBGP (external border gateway protocol) neighbor

Abstract

The application discloses a method and a device for announcing a route to an EBGP (external border gateway protocol) neighbor. The method comprises the following steps: BGP equipment in an AS (autonomous system) learns a route of a prefix, and if a plurality of routes of the prefix exist in the BGP equipment, the optimal route is found in all the routes of the prefix; if a non-optimal route which can form load sharing with the optimal route aiming at the prefix exists, a novel AS_PATH attribute is generated; the AS_PATH attribute of the optimal route is copied to the novel AS_PATH attribute; AS numbers with the AS_PATH attribute different from that of the optimal route in the non-optimal route which can form load sharing with the optimal route are put into the AS_Set with the novel AS_PATH attribute, and the AS number of the AS is added into the foremost of the AS_Sequence of the novel AS_PATH attribute; the BGP equipment sends the route of the premix to all EBGP neighbors, wherein the route carries the novel AS_PATH attribute. The method can prevent flow rate loop when the BGP equipment allows multiple paths with different AS_PATH attributes to perform load sharing.

Description

technical field [0001] The present application relates to the technical field of routing notification, and in particular to a method and device for routing routing notification to EBGP (External Border Gateway Protocol, External Border Gateway Protocol) neighbors. Background technique [0002] BGP (Border Gateway Protocol, Border Gateway Protocol) is a dynamic routing protocol used between AS (Autonomous System, Autonomous System). AS is a group of routers that have the same routing strategy and operate under the same technical management department. [0003] The focus of BGP is not to discover and calculate routes, but to control route propagation and select the best route. A router that sends BGP messages is called a BGP speaker. It receives or generates new routing information and distributes it to other BGP speakers. When a BGP speaker receives a new route from other autonomous systems, if the route is better than the currently known route or there is no such route, it...

AI Technical Summary

Problems solved by technology

[0010] Based on this regulation, when there are multiple paths with different AS_Path attributes for a destination address and mask, because the BGP peer can only advertise the optimal path among these paths, even if the user allows the multiple paths Load balancing of several paths will also cause the AS_Path attribute of some paths to be lost, thus causing traffic loops

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