Analyzing The Data; Crc16 Output - Cisco 12416 Installation And Configuration Manual

Troubleshooting the Switch Fabric
Step 3
Step 4

Analyzing the Data

crc16 Output

Cisco 12016, Cisco 12416, and Cisco 12816 Router Installation and Configuration Guide
5-30
Enter the show controllers fia command for all installed line cards and save the
output from each.
Proceed to the next section,
Switch fabric problems can occur due to failures in any of the following
components:
RPs
•
Line card hardware
•
The backplane
•
CSCs/SFCs
•
When troubleshooting switch fabric errors, look for patterns with regard to which
components are reporting errors. For example, if you combine the
show controllers fia output from all RPs and line cards, you can determine if
there is an error pattern. The following subsections discuss the values within the
output that can help you determine any error patterns.
The crc16 data line from the show controllers fia command is an important
indicator of hardware problems. If one line card or one CSC/SFC has been on line,
inserted and removed, you can expect to see some crc16 error data. However, this
number should not continue to increase. If the number is increasing, you may need
to replace a faulty hardware component. It is very important to correlate the data
from both the primary RP and the secondary RP and all installed line cards. The
example output below shows the status of the primary RP. The crc16 data line is
underlined and is showing errors from sfc1.
Chapter 5
Analyzing the Data.
Troubleshooting the Installation
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