Specifications

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Cisco 12016, Cisco 12416, and Cisco 12816 Router Clock and Scheduler, Switch Fabric, and Alarm Card Replacement Instructions
OL-13811-01
Troubleshooting the Switch Fabric
Step 5 Gather the output and proceed to the Analyzing the Data section.
Analyzing the Data
Switch fabric problems can occur due to failures in any of the following components:
• RP
• Line card hardware
• Backplane
• CSCs/SFCs
When troubleshooting switch fabric errors, you need to look for patterns with regard to which
components are reporting errors. For example, if you combine the show controllers fia output from all
the 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.
crc16 Output
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 some faulty hardware. 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.
Router#show controllers fia
Fabric configuration: Full bandwidth, redundant fabric
Master Scheduler: Slot 17 Backup Scheduler: Slot 16
From Fabric FIA Errors
-----------------------
redund fifo parity 0 redund overflow 0 cell drops 0
crc32 lkup parity 0 cell parity 0 crc32 0
Switch cards present 0x001F Slots 16 17 18 19 20
Switch cards monitored 0x001F Slots 16 17 18 19 20
Slot: 16 17 18 19 20
Name: csc0 csc1 sfc0 sfc1 sfc2
-------- -------- -------- -------- --------
los 0 0 0 0 0
state Off Off Off Off Off
crc16 0 0 0 1345 0
To Fabric FIA Errors
-----------------------
sca not pres 0 req error 0 uni FIFO overflow 0
grant parity 0 multi req 0 uni FIFO undrflow 0
cntrl parity 0 uni req 0 crc32 lkup parity 0
multi FIFO 0 empty dst req 0 handshake error 0
cell parity 0