Application Guide

[164]
Software User's
Manual
–
Version 3.0
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 an untagged frame containing LM OAM PDU - including CRC (four bytes).
Example when 'Size' = 64=> Untagged 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.
Warning will be given if selected frame size exceeds the CPU RX frame MAX
size.
Frame MIN Size is 64 Bytes.
Synthetic Synthetic frame LM is enable. 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.
Example: 'Rate' = 100f/sec => 'Meas Interval' = N*10 milliseconds.
Example: 'Rate' = 10f/sec => 'Meas Interval' = N*100 milliseconds.
In the case of service frame based LM, this attribute is not used and the
measurement interval is always the LM PDU transmission interval.
Loss
Threshold
Far end loss threshold count is incremented if a loss measurement is above this
threshold.
SLM Test ID
The Test ID value to use in SLM PDUs (see G.8013, section 9.22.1). The default
value is 0.