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In a C9200L/C9200 stack system, some brand new stacking cables or stack adapters or Uplink FRU module (NM) fail authentication which results in inability of the stack member to bootup when the affected stack cable or stack adapter is installed and in case of Uplink FRU module (NM) the switch would bootup fine but the corresponding ports on the NM would not be functional. The following error error message would be seen during the system bootup : For Stack Cable Authentication failure : The stack switch will reload and may show any of the error messages as below: *** Stack cable authentication failed for cable inserted on stack port 1 on switch 2 *** *** Stack cable authentication failed for cable inserted on stack port 2 on switch 2 *** *** Stack cable authentication failed for cable inserted on stack port 1 on switch 1 *** *** Stack cable authentication failed for cable inserted on stack port 2 on switch 1 *** For Stack Adapter Authentication failure: The stack switch will reload and may show any of the error messages as below: Stack Adapter Auth Fail : SIF_SERDES_CABLE_EASTBOUND *** Stack adapter authentication failed on stack port 1 on switch 1 *** Stack adapter authentication failed on stack port 2 on switch 1 Stack Adapter Auth Fail : SIF_SERDES_CABLE_WESTBOUND For Network Module Authentication failure: The Network Module and corresponding ports on it will not work but rest of the switch would continue to operate fine. It may show the error message as: ***Uplink FRU module hardware authentication failed***
C9200L/C9200 stack system bootup with the affected stack cable inserted. The failure mentioned here would be noticed during the system bootup and the products which have not encountered authentication failure and are already in use/functional/service will not run into this issue/failure.
There is no workaround for this issue. Cisco is proactively notifying its customers of the potential field issue via the field notice - https://www.cisco.com/c/en/us/support/docs/field-notices/705/fn70506.html This issue will be seen across a small set of units manufactured between September 2019 and January 2020. If the issue is observed as mentioned in Problem Symptom section, and the serial number is listed in the Serial Number Validation Tool (available in the above mentioned field notice page), use the Upgrade Program section in this field notice to submit a replacement request. Cisco customers can return the impacted stacking cable, stack adapter, or network module to Cisco or choose to dispose of the unit at the customer site. If the switch fails with a similar symptom, but is not included in the Serial Number Validation Tool, the customer should create a Cisco Technical Assistance Center (TAC) case to get further assistance before attempting to replace the product. Cisco is committed to the delivery of high quality units and regrets any inconvenience that this might cause. Contact TAC or your account team for further support.
The affected product will fail to authenticate when inserted into the stack port or network module slot. This failure will be noticed during system bootup. Any product that did not encounter an authentication failure and is already in use/functional/service was manufactured correctly and will not run into this issue/failure. On authentication failure, the affected product should show one of above mentioned errors.
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