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The Softswitch Service Is Interrupted Due to the Disconnection of the Interface on the NE40E from the MGW

Publication Date:  2012-07-27 Views:  84 Downloads:  0

Issue Description

Two NE40Es interconnect to share the traffic of the MGW. BFD is enabled between the NE40Es and the MGW. The IP address of the MGW, however, cannot be successfully pinged from the NE40Es. 

Alarm Information

No alarm is generated on NE40E-1. The alarm on the disconnection of the interface from the MGW for several minutes can be found on NE40E-2. The CP overload alarm is generated on the MGW. 

Handling Process

1. Connect the interfaces of the MGW connecting to the NE40Es to another board respectively. It is found that the IP address of the MGW still cannot be successfully pinged.
2. Shut down the interfaces connecting the NE40Es with the MGW and then undo the shutdown. It is found that the optical fibers work normally for optical transmission.
3. Interconnect the interfaces of the NE40Es connecting to the MGW. It is found that the IP addresses of the NE40Es can be successfully pinged in between.
4. Conduct the master/slave HRD switchover on the MGW. Then the service is resumed. 

Root Cause

Possible causes are as follows:
1. The board of NE40E-2 is faulty.
2. The optical power of the optical fiber between NE40E-2 and the MGW is too high.
3. The HRD of the MGW is faulty. 


The disconnection of the NE40Es from the MGW leads to the frequent interruption of BFD, which, in turn, causes the HRD of the MGW to stop responding. If the interface of the CE on the bearer network disconnects from the MGW frequently, it is recommended that you shut down this interface and locate the cause.