Meanings and methods of different loopbacks on an MSTP device

Meanings and methods of different loopbacks on an MSTP device:
1. Software loopback: indicates loopbacks (except physical loopbacks) that can be set on the NMS. For a line optical board, you can open the channel diagram and set loopbacks for optical interfaces and VC-4 channels. Pay attention to the monitoring channels. Otherwise, the MSTP device may be unreachable to the NMS. Software loopbacks cannot be set for VC-12 channels. For a 2M tributary board, the software loopback can be set for each 2M interface.
2. Inloop and outloop: These two types of loops are different in the direction. An inloop indicates a loop from an interface to the inside of a device. An outloop indicates a loop from an interface to the outside of a device.

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