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How the ATM Interface Handles Loopback Cells Received

The ATM interface responds to received F4 and F5 loopback cells as indicated in Table 7.

Table 7: Handling of F4 and F5 Loopback Cells Received

Loopback Cell Received

ATM Interface Response

F4 and F5 end-to-end loopback cells and segment loopback cells with the loopback location field set to all 1s (ones) and the loopback indication set.

Clears the loopback indication (sets it to all zeros) and loops back the received cell.

F4 and F5 segment loopback cells with the loopback location field set to all 0s (zeros) and the loopback indication set.

Resets the loopback indication and the location ID to all 1s (ones) and loops back the received cells.

F4 and F5 end-to-end loopback cells and segment loopback cells with the loopback location field set to the loopback location ID of the ATM interface and the loopback indication set.

Clears the loopback indication and loops back the received cell without resetting the location ID.

F5 end-to-end loopback cells with the loopback location field set to a value other than all 1s and the loopback location ID of the ATM interface.

Discards the cell.

F5 segment loopback cells with the loopback location field set to other than all 1s (ones), set to all 0s (zeros), or set to the loopback location ID of the ATM interface.

Discards the cell.


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