CCNA 2 v3.1 Module 2 Introduction to Routers

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Objectives

The Purpose of Cisco IOS Software Basic routing and switching functions Reliable and secure access to networked resources Network scalability

Router User Interface

Router User Interface Modes

Cisco IOS Naming Conventions

Operating Cisco IOS Software

Steps in Router Initialization Step 1 -- The generic bootstrap loader, in ROM, executes on the CPU card. A bootstrap is a simple, preset operation to load instructions that in turn cause other instructions to be loaded into memory, or cause entry into other configuration modes. Step 2 -- The operating system (Cisco IOS) can be found in one of several places. The location is disclosed in the boot field of the configuration register. If the boot field indicates a Flash, or network load, boot system commands in the configuration file indicate the exact location of the image. Step 3 -- The operating system image is loaded. Then, when it is loaded and operational, the operating system locates the hardware and software components and lists the results on the console terminal. Step 4 -- The configuration file saved in NVRAM is loaded into main memory and executed one line at a time. These configuration commands start routing processes, supply addresses for interfaces, set media characteristics, and so on. Step 5 -- If no valid configuration file exists in NVRAM, the operating system executes a question-driven initial configuration routine referred to as the system configuration dialog, also called the setup dialog.

Setup Mode

Router LED Indicators Cisco routers use LED indicators to provide status information. LED indicators will vary for different Cisco router models.

The Initial Router Bootup

Examining the Initial Bootup Output

Examining the Initial Bootup Output continued

Establish a Console Session All Cisco routers include an EIA/TIA-232 asynchronous serial console port. The console port is an RJ-45. Use an RJ-45 to RJ45 rollover cable with a female RJ-45 to DB-9 adapter to connect a PC to the console port

Router Modes

User Mode Commands

Privileged Mode Commands

clock set Command

Using IOS Command history

The User Interface Error Indicator

The show version Command

Summary