Cambium Networks PTP 820 Series User Manual page 671

Chapter 12: Alarm Management and Troubleshooting
Figure 408 Logical Interfaces – Loopback Page
3. In the Ethernet loopback admin field, select Enable to enable Ethernet loopback on the logical interface, or
Disable to disable Ethernet loopback on the logical interface.
4. In the Ethernet loopback duration (sec) field, enter the loopback duration time (in seconds).
5. In the Swap MAC address admin field, select whether to swap DA and SA MAC addresses during the
loopback. Swapping addresses prevents Ethernet loops from occurring. It is recommended to enable MAC
address swapping if LLDP is enabled.
6. Click Apply to initiate the loopback.
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Performing Diagnostics