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State transition method and network node device

A state transition and network node technology, applied in the field of communication, can solve problems such as service signal transmission interruption, and achieve the effect of ensuring uninterrupted transmission

Inactive Publication Date: 2009-03-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 2 As shown, this will cause the interruption of service signal transmission due to the lack of synchronous link switching between the local end and the remote end

Method used

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  • State transition method and network node device
  • State transition method and network node device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The local end works normally and is in the protection lock state. After executing the clear command (Clear), it returns to the state of no switching request, and then sends a clear protection lock notification message to the remote end to notify the remote end to clear the protection lock state, so that once the chain If the path fails, the remote end can respond to the automatic protection switching request sent by the local end. The notification message can also be sent at the same time as the clear command is executed, or it can be sent in advance, and there is no strict time relationship.

[0057] After receiving the clear protection lock notification message, the remote end executes the following steps: image 3 The process shown includes:

[0058] Step 301, the remote end judges whether its own state is in the protection lock state; if it is in the protection lock state, then execute step 302 or execute step 303; if the current state of the remote end is not the ...

Embodiment 2

[0066] A fault occurs at the local end, and automatic protection switching is required. At this time, the local end is in the protection locking state, returns to the state of no switching request after executing the clear command (Clear), and then sends a command to clear the remote protection locking to the remote end. After the remote end receives the command to clear the remote protection lock, its state transition is shown in Table 3 below:

[0067] table 3

[0068]

[0069]

[0070] Compared with Table 2, Table 3 adds a receive command, that is, a clear remote protection lock command is added.

[0071] A brief description of Table 3 is given below:

[0072] 1. When the remote end is in the state of no switching request (NR), the state remains unchanged after receiving the clear remote protection lock command sent by the local end.

[0073] 2. When the remote end is in the state of forced switching to the standby link (FS), manual switching to the standby link (M...

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Abstract

The invention discloses a state switching method and a network node device, which are applied to the state conversation between a home terminal and a remote terminal of a network node which has an automatic protection switching APS function, particularly comprise the following steps: a clear protection lockout announcement message is sent to the remote terminal or a protection lockout request command of the remote terminal is cleared, so as to enable the remote terminal to switch to be in a no switching request state; when the home terminal fails in a network, the remote terminal can automatically respond to the protection switching request of the home terminal. The invention solves the problem in the prior art that if the remote terminal is in a high priority state, namely protection lockout, the automatic protection switching request of the home terminal can not be automatically responded, so as to ensure unsynchronized automatic protection switching between the home terminal and the remote terminal to cause interrupt service signal transmission.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method for performing state transition during automatic protection switching (Automatic Protection Switching, APS) in end-to-end communication and a corresponding network node device. Background technique [0002] The APS automatic protection switching mechanism is defined on the basis of the ITU-T G.8031 / Y1342 protocol, and is a point-to-point switching mechanism between different ends of a virtual local area network (VLAN) based on Ethernet (ETH). . Such as figure 1 A typical end-to-end communication model is shown in Fig. The terminal receives maintenance commands and sends out various alarm information regularly according to the standard. [0003] The existing APS automatic protection switching protocol defines the following two protection mechanisms: [0004] 1+1 protection mechanism: Adopting the concurrent optimal receiving method, the local end copies the service i...

Claims

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Application Information

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IPC IPC(8): H04L1/22H04L12/24H04L12/46
CPCH04L1/22
Inventor 杨昌贡付海春刘明艳孙文华徐文广
Owner HUAWEI TECH CO LTD
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