Users Guide

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 the flows that contained the dropped frames, which 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.) Additionally, this 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. Enter 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.
RAS logs are independent on director class switches. Weekly review of the RAS logs is necessary to
prevent minor problems from becoming larger issues, or in catching problems at an early stage.
There are two sets of logs. The ipAddrShow command provides the IP addresses of the CP0 and
CP1 control processor blades and associated RAS logs.
The following common problems 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.