Smus; Virtual Device Contexts; Troubleshooting Features - Cisco Nexus 9000 Series Configuration Manual

SMUs

SMUs
A software maintenance upgrade (SMU) is a package file that contains fixes for a specific defect. SMUs are
created to respond to immediate issues and do not include new features. SMUs are not an alternative to
maintenance releases. They provide a quick resolution of immediate issues. All defects fixed by SMUs are
integrated into the maintenance releases.

Virtual Device Contexts

Cisco NX-OS can segment operating system and hardware resources into virtual device contexts (VDCs) that
emulate virtual devices. The Cisco Nexus 9000 Series switches currently do not support multiple VDCs. All
switch resources are managed in the default VDC.

Troubleshooting Features

Cisco NX-OS provides troubleshooting tools such as ping, traceroute, Ethanalyzer, and the Blue Beacon
feature.
When a service fails, the system generates information that can be used to determine the cause of the failure.
The following sources of information are available:
• Every service restart generates a syslog message of level LOG_ERR.
• If the Smart Call Home service is enabled, every service restart generates a Smart Call Home event.
• If SNMP traps are enabled, the SNMP agent sends a trap when a service is restarted.
• When a service failure occurs on a local module, you can view a log of the event by entering the show
• When a service fails, a system core image file is generated. You can view recent core images by entering
• CISCO-SYSTEM-MIB contains a table for cores (cseSwCoresTable).
Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 6.x
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processes log command in that module. The process logs are persistent across supervisor switchovers
and resets.
the show cores command on the active supervisor. Core files are not persistent across supervisor
switchovers and resets, but you can configure the system to export core files to an external server using
the file transfer utility Trivial File Transfer Protocol (TFTP) by entering the system cores command.
Overview