Cisco Switch Log Collection (show tech-support)

Cisco switch (Catalyst, Nexus series) logs are primarily command output; the show tech-support command contains most diagnostic information. First, enable session logging in terminal software such as PuTTY or SecureCRT, then execute the command.

General collection command

terminal length 0        # Disable pagination.
show tech-support        # Comprehensive diagnostic output; this can be lengthy.
show version             # Software version and uptime.
show inventory           # Component inventory and serial numbers.
show module              # Module status.
show interfaces          # Interface status and error counters.
show environment         # Power supplies, fans and temperature.
show logging             # Log buffer.

Catalyst platforms can additionally include show platform.

Nexus 7000 series supplementary commands

Taking Nexus 7010 as an example, for hardware inspection add:

show module uptime
show module fabric
show environment fan
show environment power
show environment temperature
show system redundancy status

Nexus switch show tech-support output may be very large; it can be directly redirected to flash memory and then retrieved via TFTP/SCP: show tech-support details > bootflash:tech.txt.

HP ProCurve switch

ProCurve switches provide at least the following two commands' output:

show flash
show version