About Beacon Mode; Configuring Beacon Mode; About Bit Error Thresholds - HP Cisco MDS 9216 - Fabric Switch Configuration Manual

Chapter 20 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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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 using Fabric Manager, follow
these steps:
Expand Switches > Interfaces and then select Gigabit Ethernet.
Step 1
You see the interface configuration in the Information pane.
Step 2 Enable the Beacon Mode option for the selected switch.
Step 3 Click Apply Changes.
The flashing green light turns on automatically when an external loopback is detected that causes the
Note
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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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 to reenable the interface.
OL-16184-01, Cisco MDS SAN-OS Release 3.x
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.
Momentary sync loss
Loose cable connection at one or both ends.
Improper GBIC or SFP connection at one or both ends
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