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
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[0055] Example one:
[0056] The local end is working 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 the subsequent link 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 sent in advance, and there is no strict time relationship.
[0057] After the remote end receives the clear protection lock notification message, execute 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, execute step 302 or execute step 303; if the current state of the remote end is not the protection ...
Example Embodiment
[0065] Embodiment two:
[0066] If the local end fails, automatic protection switching is required. At this time, the local end is in the protection lock state, and after executing the clear command (Clear), it returns to the state without switching request, and then sends a clear remote protection lock command to the remote end. After the remote end receives the clear remote protection lock command, 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, adds a clear remote protection lock command.
[0071] The following is a brief description of Table 3:
[0072] 1. When the remote end is in the no switching request state (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 forced switching to the standby link (FS), manual switching to the standby link (MS), waiting for switchbac...
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