Method and system for controlling default routing notification by IS-IS protocol

Abstract

The invention discloses a method and a system for controlling default route advertisement based on IS-IS protocol. The method comprises the following steps: configuring a default route advertisement based on IS-IS protocol on a border router of an autonomous system; binding the default route advertisement with an advertisement control policy; detecting the network operation state; and determining whether or not the network operation state meets the conditions set in the advertisement control policy, and issuing or revoking the default route advertisement according to the determination result.The system comprises a configuration module, a policy binding module, a detection module, and a determination execution module. The method can revoke or issue the default route advertisement in time according to the network operation state, and has the advantages of less calculation amount and rapid response. Therefore, the traffic can be prevented from being discarded due to the incapability of continuous forwarding, thereby more effectively utilizing the network resource.

Description

technical field [0001] The present invention relates to the field of data network communication, and in particular to a method and system for controlling default route announcement by Intermediate-system to Intermediate-system (hereinafter referred to as IS-IS) protocol. Background technique [0002] The default route is a special route whose network prefix and subnet mask are both 0, so the default route is usually called "0 / 0" route. When a network device forwards traffic, if there is no specific route to the destination of the traffic on the network device, the traffic is forwarded according to the default route. [0003] The Internet is usually made up of interconnected independent networks belonging to different network operators. Such independent networks belonging to different network operators can usually be subdivided into one or more autonomous systems. An autonomous system refers to a collection of network devices that are under the control of a management organi...

AI Technical Summary

Problems solved by technology

[0006] However, in actual network networking, due to the limitations of network equipment hardware, such as the limited number of ports, or the number of optical fibers erected between network equipment cannot meet the requirements, there may be no direct link between border routers in the same autonomous system. connection, this kind of network networking such as figure 2 As shown, there is no direct link connection between the fifth router R5 and the eighth router R8, the networking situation of this network will bring the following problems:

Since the direct link between the fifth router R5 and the second router R2 has failed, the traffic on the fifth router R5 will be discarded because it cannot continue forwarding

[0009] Similarly, when the fifth router R5 advertises the default route to other routers in the autonomous system, traffic starts from the sixth router R6, passes through the seventh router R7, the eighth router R8, the fourth router R4, and the second router R2 to the first Router R1, which is obviously a long routing forwarding path, if the direct link between the fifth router R5 and the second router R2 is restored to be effective at this time, the existing technology still needs to use a certain number of matching items configured in the routing graph to form conditional routing, traverse all routing entries in the routing table of the fifth router R5 for matching checks, and then issue the default route notification. The efficiency of this matching check process is still very low, then the sixth router R6 receives the default routing notification Before, it still used a long routing and forwarding path, so that effective network resources were not fully utilized

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