Path failure detection method and apparatus

Abstract

The invention discloses a method and a device for detecting path faults. The invention is used for realizing rapid Ethernet service path fault detection based on the prior conventional hardware, and belongs to the technical field of communication. The method comprises the following steps: acquiring data streams respectively from a working path and a protection path, respectively and accumulatively calculating the data streams acquired from the working path and the protection path in the preset n continuous sampling periods so as to acquire the respective data traffic on the working path and the protection path, wherein n is an integer more than 0; subtracting the data traffic on the protection path from the data traffic on the working path to acquire a flow different value; and comparing the flow different value with a preset flow different value threshold, and judging whether a path fault happens according to the comparison result. The embodiment of the invention can make the path fault detection occupy no user bandwidth or occupy the user bandwidth as little as possible, and can realize the seamless butting of devices produced by different manufacturers.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a path fault detection method and device. Background technique [0002] It is becoming more and more important to implement Ethernet carrier-level protection switching in the transmission network. Many Ethernet equipment manufacturers have defined and implemented Ethernet carrier-level protection, among which EPS (Ethernet Protection switch, Ethernet Protection Switching) is a typical representative. EPS provides a 1+1 / 1:1 linear Ethernet protection technology for VLAN (Virtual Local Area Network, virtual local area network). The fault detection technology in this protection technology mainly adopts CC (Continuity Check, connectivity detection), namely Between the source device and the sink device, the path connectivity status is detected by periodically sending handshake messages. As shown in Figure 1, the source device periodically sends dedicated CC messages. Un...

AI Technical Summary

Problems solved by technology

This fault detection method is essentially an in-band detection technology. The CC packets used for fault detection will occupy a part of the user's service bandwidth. In practical applications, there are problems such as difficulty in implementation and high implementation cost. The main disadvantages are as follows:

[0003] (1) Many traditional Ethernet devices do not support CC detection in hardware, and the software implementation cannot meet the switching requirements of the telecom level 50ms

Because CC message processing takes up a lot of CPU overhead, the time to implement detection by software is generally much longer than 50ms

[0004] (2) For CC detection implemented by hardware, since CC message processing takes up more hardware resources, there are also problems of high cost and limited number of services

[0005] (3) When a large number of services are used for connectivity detection, the occupation of user service bandwidth will also be serious. In extreme cases, for example, a GE port (with a bandwidth of 1000M) has 2000 VLAN services for CC detection, assuming that the CC message is at least 64 bytes , the sending period is 3.3ms, then the bandwidth occupied by the CC message is 2000*64*8 / 3.3*1000=317M, and the overhead reaches 32%

The disadvantage of this method is that on the one hand, there is no standard support, and devices from different manufacturers cannot be connected. On the other hand, traditional Ethernet device hardware cannot support it, which requires additional processing costs.

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