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
8-31
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 8 Troubleshooting Ports
Common Problems with Port Interfaces
Port Cycles Through Up and Down States
Symptom
Port cycles through the up and down states.
This problem may be attributable to an error experienced by the connected device.
Table 8-9
lists the
possible causes and solutions for this problem.
Port Is in ErrDisabled State
The ErrDisabled state indicates that the switch detected a problem with the port and disabled the port.
This state could be caused by a flapping port or a high amount of bad frames (CRC errors), potentially
indicating something wrong with the media.
Symptom
Port is in ErrDisabled state.
An E port may be isolated because of a zone merge failure.
Table 8-10
lists possible causes and solutions
to this problem.
Verifying the ErrDisable State Using the CLI
To resolve the ErrDisable state using the CLI, follow these steps:
Step 1
Use the
show interface
command to verify that the switch detected a problem and disabled the port.
Check cables, SFPs, and optics.
mds# show interface fc1/14
fc1/14 is down (errDisabled)
Table 8-9
Port Cycles Through the Up and Down States
Symptom
Possible Causes
Solutions
Port cycles through the up and down
states.
One or more packets were dropped in the
switch.
Analyze the debug log provided by the Nx
port. Select
Tools > Traceroute
using
Fabric Manager or use the
fctrace
CLI
command to analyze the link.
Look for FLOGI messages in the logs for
this port. See the
“Troubleshooting Port
Registration Issues Using the CLI”
section on page 8-17
There is a problem in FLOGI processing.
The device received unexpected packets.
There was a higher layer software error.
Table 8-10
Port is in ErrDisabled State
Symptom
Possible Cause
Solution
Port is in
ErrDisabled state.
Flapping port.
See the
“Verifying the ErrDisable State
Using the CLI” section on page 8-31
. Verify
the SFP, cable, and connections.
Switch detected a high amount of bad frames (CRC
errors), potentially indicating something wrong with the
media.
