About Beacon Mode; Configuring Beacon Mode; About Bit Error Thresholds - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Chapter 13 Configuring 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
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The speed LED also displays if the beacon mode is enabled or disabled:
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Generation 2 and Generation 3 modules and Frabic Switches do not have speed LEDs.
Note

About Beacon Mode

By default, the beacon mode is disabled on all switches. The beacon mode is indicated by a flashing
green light that helps you identify the physical location of the specified interface.
Configuring the beacon mode has no effect on the operation of the interface.

Configuring Beacon Mode

To enable beacon mode for a specified interface or range of interfaces, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# interface fc1/1
switch(config-if)#
Step 3
switch(config-if)# switchport beacon
switch(config-if)# no switchport beacon
Note The flashing green light turns on automatically when an external loopback is detected that causes the
interfaces to be isolated. The flashing green light overrides the beacon mode configuration. The state of
the LED is restored to reflect the beacon mode configuration after the external loopback is removed.

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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OL-18084-01, Cisco MDS NX-OS Release 4.x
On (solid green)—The interface attached to that port is functioning at 2000 Mbps (for 2 Gbps
interfaces).
Off or solid green—Beacon mode is disabled.
Flashing green—The beacon mode is enabled. The LED flashes at one-second intervals.
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.
Purpose
Enters configuration mode.
Selects a Fibre Channel interface and enters
interface configuration submode.
Enables the beacon mode for the interface.
Disables the beacon mode for the interface.
Cisco MDS 9000 Family CLI Configuration Guide
Fibre Channel Interfaces
13-19