Lantronix SISPM1040-3166-L Web User Guide Rev G PDF 14.13 MB - Page 351

Transition Networks SISPM1040-3xxx-L Web User Guide Loss Measurement Tx : Loss Measurement initiator is enabled/disabled. Initiator is transmitting/receiving CCM or LMM/LMR or SLM/SLR/1SL PDUs - see 'Synthetic' and 'Ended'. Service frame LM (not 'Synthetic') is only allowed with one Peer MEP configured. Synthetic frame LM is allowed with multiple Peer MEPs configured. Rx : Enable loss calculation when receiving dual-ended LM PDUs (CCM-LM/1SL). This should be used in conjunction with a dual-ended remote initiator sending either CCM-LM or 1SL PDUs to this MEP instance. This setting is ignored when the LM single-ended initiator is enabled on the same MEP instance, as this initiator is fully capable of calculating both near-to-far and far-to-near loss calculation. This setting should only be used if the initiator is not enabled or for a TX dual-ended initiator (which does not receive anything back). Priority : The priority to be inserted as PCP bits in TAG (if any). In case of enable of Continuity Check and Loss Measurement both implemented on SW based CCM, 'Priority' has to be the same. Cast : Selection of LM PDU transmitted unicast or multicast. The unicast MAC will be taken from the 'Unicast Peer MAC' configuration. In case of enable of Continuity Check and dual ended Loss Measurement both implemented on SW based CCM, 'Cast' has to be the same. Peer MEP : Peer MEP-ID for unicast LM. The MAC is taken from the 'Unicast Peer MAC' database. Only used in case of multiple peers ('Synthetic' LM). Frame Rate : This parameter selects the frame rate for the LM PDUs. This is the inverse of the transmission period as described in Y.1731. Selecting 6f/min is not valid in case of dual ended 'Service frame' LM (CCM PDU based). In case of enable of Continuity Check and Loss Measurement both implemented on SW based CCM, 'Frame Rate' has to be the same. Size : The 'Synthetic' SLM/1SL frame size. This is entered as the wanted size (in bytes) of a un-tagged frame containing LM OAM PDU - including CRC (four bytes). Example when 'Size' = 64=> Un-tagged frame size = DMAC(6) + SMAC(6) + TYPE(2) + LBM PDU LENGTH(46) + CRC(4) = 64 bytes. The transmitted frame will be four bytes longer for each tag added - 8 bytes in case of a tunnel EVC. There are two frame MAX sizes to consider. Switch RX frame MAX size: The MAX frame size (all inclusive) accepted on the switch port of Bytes. CPU RX frame MAX size: The MAX frame size (all inclusive) possible to copy to CPU of Bytes. Consider that the Peer MEP must be able to handle the selected frame size. Consider that the received SLR PDU must be copied to CPU. A Warning is given if selected frame size exceeds the CPU RX frame MAX size. Frame MIN Size is 64 Bytes. Synthetic : Synthetic frame LM is enabled. This is SLM/SLR/1SL PDU based LM. Ended : Single: Single ended Loss Measurement implemented on LMM/LMR or SLM/SLR. Dual: Dual ended Loss Measurement implemented on SW based CCM or 1SL. FLR Interval : This is the interval in number of measurement intervals where the interval Frame Loss Ratio is calculated. Meas Interval : This is the 'synthetic' LM measurement interval in milliseconds. This must be a whole number of the LM PDU transmission interval (inverse 'Rate'). This is the interval in time where the loss and FLR is calculated based on the counted number of SL OAM PDUs. It is in this interval that the calculated FLR is checked against availability, high loss and degraded FLR threshold. For example: 'Rate' = 10f/sec => 'Meas Interval' = N*100 milliseconds. In case of service frame based LM this attribute is not used and the measurement interval is always the LM PDU transmission interval. 33763 Rev. G https://www.transition.com Page 351 of 496