12 Fabric OS Troubleshooting and Diagnostics Guide
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Frame Viewer
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Frame Viewer
When a frame is unable to reach its destination due to timeout, it is discarded. You can use Frame
Viewer to find out which flows contained the dropped frames, which in turn can help you determine
which applications might be impacted. Using Frame Viewer, you can see exactly what time the
frames were dropped. (Timestamps are accurate to within one second.) This also assists in the
debug process.
You can view and filter up to 20 discarded frames per chip per second for 1200 seconds using a
number of fields with the framelog command.
Symptom Frames are being dropped.
Probable cause and recommended action
Frames are timing out.
Viewing frames.
1. Connect to the switch and log in using an account with admin permissions.
2. Type the framelog --show command.
Switch message logs
Switch message logs (RAS logs) contain information on events that happen on the switch or in the
fabric. This is an effective tool in understanding what is going on in your fabric or on your switch.
Weekly review of the RAS logs is necessary to prevent minor problems from becoming larger issues,
or in catching problems at an early stage.
Below are some common problems that can occur with or in your system message log.
Symptom Inaccurate information in the system message log
Probable cause and recommended action
In rare instances, events gathered by the track change feature can report inaccurate information to
the system message log.
For example, a user enters a correct user name and password, but the login was rejected because
the maximum number of users had been reached. However, when looking at the system message
log, the login was reported as successful.
If the maximum number of switch users has been reached, the switch still performs correctly, in
that it rejects the login of additional users, even if they enter the correct user name and password
information.
However, in this limited example, the Track Change feature reports this event inaccurately to the
system message log; it appears that the login was successful. This scenario only occurs when the
maximum number of users has been reached; otherwise, the login information displayed in the
system message log reflects reality.
Refer to the Fabric OS Administrator’s Guide for information regarding enabling and disabling track
changes (TC).
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