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The Show Command
The Show Command
| Command | Mode | Output |
|---|---|---|
| show running-config | Privileged | Current active configuration in RAM. |
| show startup-config | Privileged | Configuration stored in NVRAM that will be loaded on reboot. |
| show interfaces | User and Privileged | Status of the interfaces as well as physical and logical address, encapsulation, bandwidth, reliability, load, MTU, duplex, broadcasts, collisions, and frame errors. |
| show ip interface brief | User and Privileged | Status of the interfaces and their logical addresses. |
| show controller | User and Privileged | Microcode of the interface including DCE/DTE cable connection. |
| show flash | User and Privileged | Filenames and sizes of IOS files stored in Flash memory. |
| show version | User and Privileged | IOS version, system uptime, amount of RAM, NVRAM, Flash memory, and configuration register. |
Interface Status
| Layer 1 | Layer 2 (Line Protocol) | Possible Symptoms |
|---|---|---|
| Up | Up | None. Interface is functional. |
| Up | Down | Encapsulation mismatch, lack of clocking on serial interfaces. |
| Down | Down | Cable is disconnected or attached to a shutdown interface on the far-end device. |
| Administratively Down | Down | Local interface was not enabled with the no shutdown command. |
