About Bit Error Thresholds; Switch Port Attribute Default Values - Cisco MDS 9000 Series Configuration Manual

Fibre Channel Interfaces
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m

About 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:
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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 reenable the interface.
You can configure the switch to not disable an interface when the threshold is crossed. By default, the
threshold disables the interface.
To disable the bit error threshold for an interface, follow these steps:
Command
Step 1
switch# config t
Step 2
switch(config)# interface fc1/1
switch(config-if)#
Step 3
switch(config-if)# switchport ignore
bit-errors
switch(config-if)# no switchport ignore
bit-errors
Regardless of the setting of the switchport ignore bit-errors command, the switch generates a syslog
Note
message when bit-error threshold events are detected.

Switch Port Attribute Default Values

You can configure attribute default values for various switch port attributes. These attributes will be
applied globally to all future switch port configurations, even if you do not individually specify them at
that time.
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
2-18
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.
Chapter 2
Purpose
Enters configuration mode.
Selects a Fibre Channel interface and enters
interface configuration submode.
Prevents the detection of bit error threshold
events from disabling the interface.
Prevents the detection of bit error threshold
events from enabling the interface.
OL-19445-02, Cisco MDS NX-OS Release 4.2(x)
Configuring Interfaces