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Problem Description
A bureau's fiber optic cable outage caused a 10GMSP ring inversion, and when the fiber optic cable was restored, service was interrupted on NE40 equipment interfacing with transmission. The customer tests 1+1MSP protection inversion, and when the fiber optic path is interrupted, the service of NE40 equipment interfacing with transmission is interrupted.
Warning MessageThe disappearance or appearance of R-LOS on the primary link of the transmission link is accompanied by an automatic shut down of the NE40 port.
ProcessingChange the BFD value greater than 50 ms and retest the inversion with no interruption of NE40 equipment.
Root CauseFrom the definition of MSP, multiplexing segment protection refers to a protection method that completes a series of protocol handshaking processes with the help of K bytes in the multiplexing segment in the overhead, so that the service signals originally transmitted on the damaged optical fiber are transferred to the protection route for transmission, thus enabling the original service to continue to be transmitted without interruption.MSP is classified into linear multiplexing segment protection and ring multiplexing segment protection.LMSP automatically shifts the service signals to the protection route the instant the primary optical fiber fails . LMSP automatically switches the services passing through the primary link to the backup link at the moment of the failure of the primary link.G.814 recommendation stipulates that the inversion time of the linear multiplexing segment is 50ms.The bureau here sets it as a restoration type.RMSP has no dedicated primary and backup fibers.The first half of the time slot of each fiber is the primary channel, and the second half of the time slot is the backup channel, and the services flow in the opposite direction on the two fibers.G.814 recommendation stipulates that the inversion time of the linear multiplexing segment is 50ms.G.814 recommendation stipulates that the linear multiplexing segment is 50ms.G.814 recommendation specifies the inversion time of the primary and backup fibers. The multiplexing segment inversion time is 50ms. the bureau here sets it to recovery.
BFD is a standard protocol used to realize fast fault detection, BFD has two operation modes: asynchronous mode and query mode. At present, our company only supports asynchronous mode. In this mode, both ends of the session send BFD control messages periodically, and the status of the session is detected according to whether or not the BFD control message of the other end can be received. The purpose of adding BFD protocol to NE40 device is to allow the routing protocol to calculate new routes as soon as possible after getting the BFD notification, so as to shorten the convergence time. However, because BFD detects link messages for 10 ms at a time, in this case, when MPS protection inversion occurs in transmission, NE40 will detect the link message interruption at the moment of inversion, which leads to automatic shut down of NE40 device ports.
BFD is a standard protocol used to realize fast fault detection, BFD has two operation modes: asynchronous mode and query mode. At present, our company only supports asynchronous mode. In this mode, both ends of the session send BFD control messages periodically, and the status of the session is detected according to whether or not the BFD control message of the other end can be received. The purpose of adding BFD protocol to NE40 device is to allow the routing protocol to calculate new routes as soon as possible after getting the BFD notification, so as to shorten the convergence time. However, because BFD detects link messages for 10 ms at a time, in this case, when MPS protection inversion occurs in transmission, NE40 will detect the link message interruption at the moment of inversion, which leads to automatic shut down of NE40 device ports.
Recommendation and SummaryWhen adding new protocols to the docking equipment, if it involves detecting whether the transmission link is good or bad, you should communicate with the transmission engineers and make relevant tests in time to avoid the occurrence of failures.
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