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Identifying a failed Ethernet cable on an Oracle Database Machine (Exadata) (Doc ID 1994662.1)

Last updated on JANUARY 31, 2020

Applies to:

Oracle Exadata Hardware
Information in this document applies to any platform.

Purpose

The symptoms of a cable failure are many.  Some of the more obvious is the link light on the switch or the NIC will not light.  Another might be a degraded network bandwidth.  Time-Domain Reflectometer (TDR) needs to be executed from the switch and can't be done from the host.  TDR requires specific circuitry that is not typically available on the network interface card.

To use TDR, you will need “enable” privileges on the switch to issue the commands needed.  Ethtool is another tool to used to validate TDR's output.  Ethtool shows the settings on the NIC so one can compare them to the settings on the switch.

For more information on Cisco's implementation of TDR see http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/intrface.html#wpmkr1066782

Troubleshooting Steps

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