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20-21
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 20 Configuring Interfaces
Fibre Channel Interfaces
• 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 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.
Refer to the Cisco MDS 9000 Family CLI Configuration Guide to disable the bit error threshold for an
interface.
Note Regardless of disabling the switch port ignore bit-error threshold for an interface, the switch generates
a syslog 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.
Refer to the Cisco MDS 9000 Family CLI Configuration Guide to configure switch port attributes.
About SFP Transmitter Types
The small form-factor pluggable (SFP) hardware transmitters are identified by their acronyms when
displayed. Table 20-5 defines the acronyms used for SFPs (see the “Displaying SFP Transmitter Types”
section on page 20-22).
Table 20-5 SFP Transmitter Acronym Definitions
Definition Acronym
Standard transmitters defined in the GBIC specifications
short wavelaser swl
long wavelaser lwl
long wavelaser cost reduced lwcr
electrical elec
Extended transmitters assigned to Cisco-supported SFPs
CWDM-1470 c1470
CWDM-1490 c1490
CWDM-1510 c1510
CWDM-1530 c1530
CWDM-1550 c1550
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