Detecting method of reachability among IP network equipments and its application in public dialing network platform accessing backup

Abstract

The present invention discloses a method for detecting accessibility between IP network devices, wherein the route reaching the opposite end and whether the opposite end operates normally are detected, the device transmits the HELLO message to the opposite end device, and the opposite end device receives the HELLO message answer. The invention provides a backup mechanism using two or more RMC devices as network backup.

Description

technical field [0001] The invention relates to a network communication technology, in particular to a method for detecting the accessibility between IP network devices and its application in access backup of a public dial-up network platform. Background technique [0002] This application is related to the application "Public Dial-Up Network Platform and Access Method" submitted by our company (hereinafter referred to as "related application"). [0003] The current main solution to the reliability problem is to select reliable equipment to minimize losses. Reliable equipment usually uses redundant power supply and redundant backup of main components of the equipment, such as the main control board of the RMC. In addition, the equipment is required to have Good self-recovery ability. Generally, the methods for a device to detect whether another IP device is reachable include: 1. If the physical link is directly connected, if a fault occurs, the physical signal can be used t...

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Problems solved by technology

[0040] In the existing solutions, it is assumed that the faults are all caused by the RMC itself, but in actual applications, the link from the NAS to the RMC is also very likely to fail, so the original technology cannot guarantee reliability

[0041] In addition, for how to detect the reachability between IP network devices, in the current method, the same type of network uses the link maintenance function, and the heterogeneous network uses the routing protocol to maintain, but in various practical applications, due to For various reasons, such as the limitations of IP network equipment, the structure of the old network, and network design requirements, some IP network equipment cannot run routing protocols with the peer IP network equipment it cares about, such as HDLC (High-level Data Link Protocol) There are also two IP devices interconnected by physical transmission devices in the middle. Another example is that two routers are configured through static routing and interconnected through a layer 2 switch. At this time, it is difficult to judge whether the two devices are still connected normally. of

In this way, the IP network device cannot know whether the path of the peer IP network device it cares about is smooth, that is, it cannot know whether the IP network device it forwards to the peer can reach it correctly and forward it out. Devices typically do not have routing information for the entire network, and may not be running routing protocols

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