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Loss Summary

Monitoring > Tunnel Health > Loss > Summary

The Loss chart shows tunnels that have the most dropped packets. Statistics are summarized for the selected time period.

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Loss percentages, before and after Forward Error Correction (FEC), are determined by data that the local EdgeConnect observes. Two types of loss are measured:

  • Pre-FEC Loss % – Percent of data packets lost before applying FEC / Total sent packets. This measure indicates what the packet loss would be if FEC were not applied.

  • Post-FEC Loss % – Percent of data packets lost after applying FEC / Total sent packets. This measure indicates what the packet loss is after FEC is applied.

The total number of sent packets over the link is calculated based on three parameters:

  • Total received packets (SUM_WRX_PKTS)

  • Recovered packets from FEC (CORRECTED_PACKETS)

  • Unrecovered packets after FEC (SUM_POST_LOSS)

Calculations are based on the following formulas:

  • Total sent packets = SUM_WRX_PKTS + CORRECTED_PACKETS + SUM_POST_LOSS

  • Packets lost in transmission (SUM_PRE_LOSS) = CORRECTED_PACKETS + SUM_POST_LOSS

Based on the above information, the Pre-FEC and Post-FEC Loss percentages are calculated as follows:

  • Pre-FEC Loss (%) = SUM_PRE_LOSS * 100 / (SUM_WRX_PKTS + SUM_PRE_LOSS)

  • Post-FEC Loss (%) = SUM_POST_LOSS * 100 / (SUM_WRX_PKTS + SUM_PRE_LOSS)

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