building a cicso network for windows 2000 phần 3 ppt

94 Chapter 3 • Cisco Hardware and IOS Basics

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Table 3.2 Continued

Model Ports Comments

1602 R

1603 R

1604 R

1605 R

1 Ethernet

1 Serial w/integrated 56

Kbps CSU/DSU (Channel

Service Unit/Data Service

Unit)

1 WAN interface card slot

1 Ethernet

1 ISDN BRI (S/T interface)

1 WAN interface card slot

1 Ethernet

1 ISDN BRI with inte￾grated NT1 (U interface)

1 S-bus port for ISDN

phones

1 WAN interface card slot

2 Ethernet

1 WAN interface card slot

The serial port can be used to sup￾port asynchronous serial connections

of up to 115.2 Kbps. It also provides

support for synchronous serial con￾nections (Frame Relay, Switched 56,

and X.25) of up to 2.048 Mbps.

The WAN interface cards available for

the WAN interface slot include Serial

(asynchronous and synchronous),

T1/Fractional T1 CSU/DSU, 56/64 Kbps

four-wire CSU/DSU, ISDN BRI with S/T

interface, and ISDN BRI with inte￾grated NT1, U interface.

The WAN interface cards available for

the WAN interface slot include Serial

(asynchronous and synchronous),

T1/Fractional T1 CSU/DSU, 56/64 Kbps

four-wire CSU/DSU, ISDN BRI leased

line.

The WAN interface cards available for

the WAN interface slot include Serial

(asynchronous and synchronous),

T1/Fractional T1 CSU/DSU, 56/64 Kbps

four-wire CSU/DSU, ISDN BRI leased

line.

The WAN interface cards available for

the WAN interface slot include: Serial

(asynchronous and synchronous),

T1/Fractional T1 CSU/DSU, 56/64 Kbps

four-wire CSU/DSU, ISDN BRI with S/T

interface, and ISDN BRI with inte￾grated NT1, U interface.

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Cisco Hardware and IOS Basics • Chapter 3 95

800 Series

The 800 series (shown in Figure 3.12) consists of 11 different models

including the 801, 801 CAPI, 802, 802 IDSL, 803, 803 CAPI, 804, 804

IDSL, 805, 827, and 827-4V. This series of routers is designed for small

offices as well as telecommuters. The 800 series provides integrated voice

and data support as well as security with VPNs. It can be confusing trying

to compare the differences in the different models within the 800 series so

Table 3.3 logically illustrates the differences.

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Figure 3.12 The front of a Cisco 800 Series router

Table 3.3 Port Configurations of the Cisco 800 Series Routers

Model Ports Comments

801

801 CAPI

802

802 IDSL

803

803 CAPI

1 Ethernet

1 IDSN BRI (S/T interface)

1 Ethernet

1 IDSN BRI (S/T interface)

1 Ethernet

1 IDSN BRI with inte￾grated NT1 (U interface)

1 Ethernet

1 IDSL (ISDN Digital

Subscriber Line) with inte￾grated NT1 (U interface)

4-port Ethernet hub

1 IDSN BRI (S/T interface)

2 Analog RJ-11

4-port Ethernet hub

1 IDSN BRI (S/T interface)

2 Analog RJ-11

Provides support for European ISDN

and the Common Application

Programming Interface (CAPI).

Supports line rates up to 144 Kbps.

Supports call waiting, call-waiting

cancel, call hold, call retrieve, three￾way conferencing, and call transfer.

Provides support for European ISDN

and the Common Application

Programming Interface (CAPI).

Continued

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96 Chapter 3 • Cisco Hardware and IOS Basics

Cisco IOS

The “brains” of both Cisco switches and Cisco routers is the Internetwork

Operating System (IOS). Without the IOS the hardware might as well be

used as boat anchors. The IOS is responsible for everything from allowing

the configuration of interfaces, to security using ACLs, and everything in

between.

Differences in Switch and Router IOSs

The term Internetwork Operating System can be misleading—you may

think that all IOSs are created equally. In reality, there is a difference in

the IOSs used by switches and routers. Switch IOSs can support the con￾figuration of VLANs, VTP, and items unique to switches, whereas router

IOSs provide configuration support for various WAN configurations. The

IOSs do have some commonality as they are used to configure Ethernet

(and other) interfaces that can be present on both types of equipment.

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Table 3.3 Continued

Model Ports Comments

804

804 IDSL

805

827

827-4V

4-port Ethernet hub

1 IDSN BRI with inte￾grated NT1 (U interface)

2 Analog RJ-11

4-port Ethernet hub

1 IDSL with integrated

NT1 (U interface)

1 Ethernet

1 Serial

1 Ethernet

1 ADSL (Asymmetric

Digital Subscriber Line)

1 Ethernet

1 ADSL

4 Analog RJ-11

Supports call waiting, call-waiting

cancel, call hold, call retrieve, three￾way conferencing, and call transfer.

Supports line rates up to 144 Kbps.

Supports both synchronous serial

(Frame Relay, leased line, and X.25)

connections up to 512 Kbps and

asynchronous dial-up connections.

Ideal for up to 20 users in a small

office.

Ideal for up to 20 users in a small

office.

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Cisco Hardware and IOS Basics • Chapter 3 97

Router Feature Sets

Not only are there differences in switch and router IOSs, but there are

even different feature sets among the router IOSs geared toward different

functions. The decisions don’t stop after you decide on the routers for your

Windows 2000 network infrastructure. You need to determine which IOS

feature set meets the needs for the routers in question since each feature

set contains a specific set of Cisco IOS features. Let’s examine some of the

different feature sets that you need to be aware of.

Enterprise

The Enterprise feature set provides the widest range of features available

in the IOS. Some of the features normally found within the Enterprise fea￾ture set, which can vary depending on the hardware platform, are support

for Apollo Domain, Banyan VINES, Frame Relay SVC support, Intermediate

System-to-Intermediate System (IS-IS), Kerberos V client support, and

other items normally seen in the enterprise environment.

IP/IPX/IBM

The IP/IPX/IBM feature set provides support for adding IP, IPX, and IBM

routing support to the router. The IBM features include support for

Systems Network Architecture (SNA) bisync, caching and filtering, NetView

Native Service Point, as well as numerous other items.

IP Plus

The IP Plus feature set adds items related to the Internet Protocol. Some of

the items present in the IP Plus feature set include Network Address

Translation (NAT), Hot Standby Router Protocol (HSRP), Voice-over IP

(VoIP), and ATM LAN Emulation (LANE). Of course these features can vary

and are dependent on the hardware on which the IOS is running.

Firewall Feature Set

The Firewall feature set provides additional security functionality to the

routers on which it is running. It provides not only firewall features such

as stateful, application-based filtering, but also intrusion detection. Alerts

can be configured to provide reporting in real-time. The Firewall feature set

can be combined with IP Security (IPSec) and Layer 2 Tunneling Protocol to

provide a complete virtual private network environment.

Memory Requirements

The amount of memory required for your router depends in part on the

feature set you plan to use. For example, on a 3620 router with the

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98 Chapter 3 • Cisco Hardware and IOS Basics

Enterprise feature set you need a minimum of 16MB of flash memory and

64MB of dynamic random access memory (DRAM). If you decide instead to

use the IP/H323 feature set, the router requires a minimum of 8MB of

flash memory and 48MB of DRAM. Of course these are just the minimum

requirements for the feature set and you may require more memory

depending on the use of the router within your Windows 2000 network

infrastructure.

Command Line Interface (CLI)

The most common method of interacting with the router is through the

command line interface provided by the Cisco IOS software. Every Cisco

router has a console port that can be directly connected to a PC or ter￾minal so that you can type commands at the keyboard and receive output

on a terminal screen. The part of the Cisco IOS software that provides the

user interface and interprets the commands you type is called the com￾mand executive, or EXEC.

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Enhanced Editing Keys

Some of the commands you will type in the CLI can be very long.

Cisco has been thoughtful enough to include a series of keystrokes that

you can use to navigate around on the command line. This feature is

known as enhanced editing, and for those of you familiar with UNIX,

you will recognize the following keystrokes as the EMACS editing

keystrokes.

CTRL-A Go to the beginning of the line

CTRL-E Go to the end of the line

ESC-B Go back to the beginning of the previous word

ESC-F Go forward to the beginning of the next word

CTRL-B Go back one character

CTRL-F Go forward one character

These are not the only keys available to you in the IOS; I encourage

you to research the documentation that came with your router for other

time-saving keystrokes.

For IT Professionals

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Cisco Hardware and IOS Basics • Chapter 3 99

How to Get Around in the IOS

Moving around the IOS is similar to typing at an MS-DOS prompt on a PC.

You don’t change directories as you do on a PC, but you can change the

mode you are operating in as well as various configuration settings.

The IOS has a context-sensitive Help feature built in. This is a feature

you will learn to depend on as you work with the command line interface.

To enter the Help system all you need to do is type a ?. The screen will

show the commands that are available to you. This list changes depending

on the mode you are in within the IOS as well as on where you are in the

IOS when you enter the help system. You can also enter the help system if

you forget the syntax for a command. All you have to do is type the part of

the command you remember and then a ?. The help system will display

the options available to you at that point.

While in the IOS you do not have to type the full command name. You

can abbreviate commands to the point that it is unique so that the IOS

knows what you want to do. Look at the following example from a Catalyst

2924 switch in which the command show running-config has been abbre￾viated to sh ru. The IOS understands what you want to accomplish but

you have saved yourself a lot of typing!

2924Outside#sh ru

Building configuration...

Current configuration:

!

version 11.2

no service pad

no service udp-small-servers

no service tcp-small-servers

!

hostname 2924Outside

!

enable secret 5 $1$.LeN$Cjuf.cxxxxxxxxxyu9YTKgU/

!

username kesnet privilege 15 password 7 xxxxxxxxxx 0 9

!

!

clock timezone Central 0

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