Chapter 8

ROM:

(Bootstrap Program)

Flash

(Cisco IOS Software)

NVRAM

(Startup Configuration)

RAM:

(Working Memoryand Running Configuration)

dark LED meaning

10 Mbps,

flashing green meaning

1000 Mbps (1 Gbps).

Figure 8-7 CLI Configuration Mode Versus Exec Modes

259

Example 8-1 Navigating Between Different Configuration Modes

260

Table 8-6 Common Switch Configuration Modes

261

Internetwork Operating System (IOS)

Cisco operating system software that provides the majority of a router's or switch's features, with the hardware providing the remaining features.

copy command

Command in the command line interface for making a copy of a file and pasting it in another location.

VTY password

Limits device access over Telnet

Console password

Limits device access using the console connection

Context-setting commands

More importantly, the context tells the switch the topic you care about right now, so when you use the ? to get help, the switch gives you help about that topic only.

Cisco IOS Software Command Help

PG 256 Chapter 8: Operating Cisco LAN Switches

Telnet

Port 23

Running-config

Stores the currently used configuration commands. This file changes dynamically when someone enters commands in configuration mode.

Startup-config

Stores the initial configuration used any time the switch reloads Cisco IOS. (NVRAM)

SSH

TCP 22

So far

The switch will work without any configuration—just plug in the power and Ethernet cables, and it works. However, you should at least connect to the switch console port and configure passwords for the console, Telnet, SSH, and the enable secret password.

terminal monitor

Which command can an administrator issue on a Cisco router to send debug messages to the vty lines?

debug

command asks the switch to continue monitoring different processes in the switch. The switch then sends ongoing messages to the user when different events occur.

show commands

commands that ask the switch to list currently known facts

The switch CLI can be accessed through three popular methods—

console, Telnet, and Secure Shell (SSH)

a solid green light,

meaning 100 Mbps,

Config File Common Name

startup-config running-config

reload command

switch disables all currently enabled debug options.

line vty 0 15

tells the switch that the commands that follow apply to all 16 possible concurrent virtual terminal connections to the switch, which includes Telnet as well as SSH access.

if it is the hostname followed by the >

the user is in user mode

if it is the hostname followed by the #,

the user is in enable mode.

The default console port settings on a switch are as follows: Note that the last three parameters are referred to collectively as "8N1."

■ 9600 bits/second ■ No hardware flow control ■ 8-bit ASCII ■ No stop bits ■ 1 parity bit