Bit Error Thresholds
The bit error rate threshold is used by the switch to detect an increased error rate before performance degradation seriously affects traffic.
The bit errors can occur for the following reasons:
- Faulty or bad cable.
- Faulty or bad GBIC or SFP.
- GBIC or SFP is specified to operate at 1 Gbps but is used at 2 Gbps.
- GBIC or SFP is specified to operate at 2 Gbps but is used at 4 Gbps.
- Short haul cable is used for long haul or long haul cable is used for short haul.
- Momentary sync loss.
- Loose cable connection at one or both ends.
- Improper GBIC or SFP connection at one or both ends.
A bit error rate threshold is detected when 15 error bursts occur in a 5-minute period. By default, the switch disables the interface when the threshold is reached. You can enter a shutdown and no shutdown command sequence to re-enable the interface.
You can configure the switch to not disable an interface when the threshold is crossed. By default, the threshold disables the interface.
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