Summary: This article illustrates some useful Command-Line interface (CLI) commands that can help when troubleshooting an issue. Support may also ask for these when a case has been raised.
How to login to the CLI and capture output
We recommend using a free SSH client to connect to the Switch, PuTTy being a well known and used example. Before you login to the Switch, set the session output to log to a file.
Enter the IP address of the Switch into the connection page and click Open
You will then be prompted to login using your Administrator credentials
After successful login, you can enter the below commands
Commands:
UPDATE: Included in cnMatrix release 4.4, the show tech command has been added. This command compiles the most common data from various show commands for debugging purposes. If support ask for a tech-support file/log, run the show tech command and export it via tftp or scp. You will need your own tftp or scp server (there are plenty that are freely available) to export the file.
show tech Display data of different show commands
Example:
copy show-tech tftp://server/file
Example:
copy show-tech scp://username@serveripaddress Copy the output of show tech command to remote file
Example:
show logging - Shows the event log
show running-config - Shows the running config of the device, note it will not show items that are default. For example, the default port mode is Hybrid, so when you look at the running-config, it wont show what port mode it is unless it has been changed to Access or Trunk.
show spanning-tree – Shows the current status of spanning-tree
show ip route – Shows the routing table
show system information – Shows system info such as Serial, Uptime, Software version etc
show management – Shows the Cloud status and what Management methods are available to use
show power detail – Shows the PoE status, the Maximum Power available and the Total Consumed Power i.e PoE budget
show power inline - Shows the individual port statuses and any errors.
show ip interface – Shows the IP addresses the device is using and DNS server, a good one to check if the Switch isn’t connecting to Cloud
show env all - Shows the operational status of the Switch, Memory and CPU usage, fan status’ and the current Switch temperature.
show interface counters - Shows the incoming and outgoing packet counts for each interface. Useful to see counts for the number of Broadcasts, Multicasts and if packets are incoming/outgoing for an interface.