Below are commands to help you troubleshoot and perform basic diagnostics:
| Command | Description |
|---|---|
ping {hostname | system-address} [source source-address] |
Reveals basic network connectivity |
traceroute {hostname | system-address} [source source-address] |
Traces the route that packets take to reach a destination |
show interfaces |
Displays detailed information about interface status, settings and counters |
show ip route |
Shows the routing table of the device |
show interface status |
Displays the interface line status |
show interfaces trunk |
Lists information about the currently operational trunks and the VLANs supported by those trunks |
show version |
Displays information about the IOS version, uptime and hardware configuration |
show running-config |
Displays the current active configuration on the device |
show tech-support |
Generates a comprehensive report of the device’s configuration and status (useful for advanced troubleshooting) |
show cdp |
Shows whether CDP is enabled globally |
show cdp neighbors [detail] |
Lists summary (or detailed) information about each neighbor connected to the device |
cdp runno cdp run |
Enables or disables Cisco Discovery Protocol (CDP) for the device |
show mac address-table |
Displays the MAC address table |
show vtp status |
Lists the current VLAN Trunk Protocol (VTP) status, including the current mode |