Show Menu
Cheatography
  1. Home >
  2. Cheat Sheets >

Cisco IOS Cheat Sheet (DRAFT) by [deleted]

Cisco IOS

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Termin­ology

IOS
Intern­etw­orking Oparating System
CLI
Command Line Interface

Device Startup Sequence

Cisco routers and switches generally perform the same steps upon initial startup:
* Discover device hardware
* Find and Load IOS image
* Find and Load config­uration file

Memory Types

Flash
* Contents of memory are retained even after system is shut down
* Moderate Size
* Cisco IOS stored here copied and run from DRAM
NVRAM
Non-Vo­latile Random Access Memory
* Contents of memory are retained even after system is shut down
* Small Size
* Startu­p-c­onf­igu­ration
DRAM
Dynamic Random Access Memory
* All contents are erased when power is lost
* Large Size
* IOS is here during run-time
* Runnin­g-c­onf­igu­ration
 

IOS Command Structure

IOS Command Hierarchy
 
Router>
User (or EXEC) mode
 
Router#
Privileged EXEC (or Enable) mode
Config­uration Modes
 
Router(config)#
Global Config­uration Mode
 
Router(config-if)#
Interface Config­uration Mode
 
Router(config-router)#
Router Config­uration Mode
Usage of Exit, End, Ctrl-Z