Loss Of Lane Alignment (LOL) is declared on 100G interfaces when it has not been possible to successfully recover the Logical Lane Marker (LLM) from the logical lanes and then re-assemble the OTU4 frame.
During the lane recovery process the LLM will be present in a lane every 16320 bytes, when the same LLM value has been present for 5 consecutive intervals this LLM value will be accepted and the lane recovery will be considered “In Recovery”.
Loss Of Lane Alignment will be declared in the case where the lane recovery process has failed – either by two or more logical lanes found to contain identical logical lane markers or if there was not a sequence of 5 consecutive LLM values.
Loss Of Lane Alignment is different from LOF Lane in that the interface has been receiving data blocks that have been framed up on, however the LLM has not been successfully recovered in order to re-align the lanes in the correct order. Similarly to LOF Lane the condition can be declared for each logical lane.