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NX-OS Troubleshooting Tools

Chapter Description

In this sample chapter from Troubleshooting Cisco Nexus Switches and NX-OS, you will review the various tools available on the Nexus platform that can help in troubleshooting and day-to-day operation.


This chapter focused on various NX-OS tools that can be used to troubleshoot complex problems. It examined various packet capture capabilities with Nexus platforms, including SPAN and ERSPAN. NX-OS provides the following capabilities, which are useful for troubleshooting latency and drops from buffer congestion:

  • SPAN-on-Latency

  • SPAN-on-Drop

The chapter explained how to use internal platform tools such as Ethanalyzer and packet tracer; it also described NetFlow and sFlow use cases, deployment, and configuration for collecting statistics and network planning. NTP ensures that all clocks are synchronized across multiple devices, to properly correlate timing of events across devices. EEM scripts are useful for troubleshooting on a daily basis or collecting information after an event. Finally, the chapter looked at the logging methods available with NX-OS, including accounting and event-history logging.

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