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Understanding Interface Numbering and Cisco IOS Software Basics

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Table Of Contents

Understanding Interface Numbering and Cisco IOS Software Basics

Identifying the Cisco VG202 and Cisco VG204 Voice Gateways

Cisco VG202 Voice Gateway

Port Numbering Conventions

Understanding Cisco IOS Software Basics

Getting Help

Command Modes

Undoing a Command or Feature

Saving Configuration Changes

Upgrading to a New Cisco IOS Release

Cisco VG202 and Cisco VG204 Voice Gateways Deployment Scenario

Where to Go Next


Understanding Interface Numbering and Cisco IOS Software Basics

This chapter provides an overview of interface numbering in the Cisco VG202 and Cisco VG204 voice gateways (VG). It also describes how to use the Cisco IOS software commands.

This chapter presents the following major topics:

•Identifying the Cisco VG202 and Cisco VG204 Voice Gateways

•Port Numbering Conventions

•Understanding Cisco IOS Software Basics

•Upgrading to a New Cisco IOS Release

•Where to Go Next

Identifying the Cisco VG202 and Cisco VG204 Voice Gateways

Cisco VG202 and Cisco VG204 voice gateways deliver analog voice gateways for the service provider as well as commercial and enterprise unified communication markets. Both voice gateways provide voice connectivity to devices such as analog phones, fax machines and modems.

Cisco VG202 and Cisco VG204 voice gateways provide support for 2-FXS (Cisco VG202) and 4-FXS (Cisco VG204) ports, each supporting independent telephone numbers giving you two or four separate lines, and parity with Cisco IOS fax/modem, security, and Session Initiation Protocol (SIP) features. Both voice gateways are configurable with Cisco Unified Communications Manager (CUCM).

Note Cisco VG202 and Cisco VG204 voice gateways are fixed voice gateways and do not support interface cards.

Note Your Cisco IOS software release may not support all of the features documented in this document. For the latest feature information and caveats, see the release notes for your platform and software release.

Note Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Figure 1-1 shows the front panel of the Cisco VG202 voice gateway. Figure 1-2 shows the front panel of the Cisco VG204 voice gateway.

Cisco VG202 Voice Gateway

The Cisco VG202 and Cisco VG204 chassis include console, auxiliary, FXS, and FE ports.

Figure 1-1 Cisco VG202 Voice Gateway Front Panel

Figure 1-2 Cisco VG204 Voice Gateway Front Panel

Port Numbering Conventions

Figure 1-3 and Figure 1-4 show the port numbers of the Cisco VG202 and Cisco VG204 Voice Gateways.

Figure 1-3 Back Panel Feature Locations on the Cisco VG202 Voice Gateway

1

Fast Ethernet port 1,
Fast Ethernet port 0

2

Serial port—console or auxiliary

3

FXS ports

4

Power connector

5

Chassis ground connection

6

Kensington security slot


Figure 1-4 Back Panel Feature Locations on the Cisco VG204 Voice Gateway

1

Fast Ethernet port 1,
Fast Ethernet port 0

2

Serial port—console or auxiliary

3

FXS ports

4

Power connector

5

Chassis ground connection

6

Kensington security slot


Port numbering conventions for the Cisco VG202 and Cisco VG204 Voice Gateways are as follows:

•Foreign Exchange Station (FXS) voice port numbering begins at 0/0 and extends to 0/2 or 0/4, depending on the number of voice ports.

•10/100BASE-T Fast Ethernet ports are numbered Fast Ethernet 0/0 and Fast Ethernet 0/1, from right to left.

Understanding Cisco IOS Software Basics

This section describes what you need to know about the Cisco IOS software before you configure the VG by using the command-line interface (CLI). This chapter includes the following:

•Getting Help

•Command Modes

•Undoing a Command or Feature

•Saving Configuration Changes

•Where to Go Next

Understanding these concepts will save time as you begin to use the CLI. If you have never used Cisco IOS software or if you need a refresher, take a few minutes to read this chapter before you proceed to the next chapter.

Note For a comprehensive view of Cisco IOS configuration fundamentals, see the Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.4 document.

If you are already familiar with Cisco IOS software, proceed to Chapter 2, "Using the setup Command Facility."

Getting Help

Use the question mark (?) and arrow keys to help you enter commands:

•For a list of available commands, enter a question mark: 

VG> ?

•To complete a command, enter a few known characters followed by a question mark (with no space): 

VG> s?

•For a list of command variables, enter the command followed by a space and a question mark: 

VG> show ?

•To redisplay a command you previously entered, press the Up arrow key. You can continue to press the Up arrow key for more commands.

Command Modes

The Cisco IOS user interface involves different modes. Each command mode permits you to configure different components on your VG. The commands available at any given time depend on which mode you are currently in. Entering a question mark (?) at the prompt displays a list of commands available for each command mode. Table 1-1 lists the most common command modes.

Table 1-1 Common Command Modes 

Command Mode
Access Method
VG Prompt Displayed
Exit Method

User EXEC

Log in.

VG>

Use the logout command.

Privileged EXEC

From user EXEC mode, enter the enable command.

VG#

To exit to user EXEC mode, use the disable, exit, or logout command.

Global configuration

From the privileged EXEC mode, enter the configure terminal command.

VG(config)#

To exit to privileged EXEC mode, use the exit or end command, or press Ctrl-Z.

Interface configuration

From the global configuration mode, enter the interface type number command, such as interface fast ethernet 0/0.

VG(config-if)#

To exit to global configuration mode, use the exit command.

To exit directly to privileged EXEC mode, press Ctrl-Z.


Timesaver Each command mode restricts you to a subset of commands. If you are having trouble entering a command, check the prompt, and enter the question mark (?) for a list of available commands. You might be in the wrong command mode or using the wrong syntax.

In the following example, notice how the prompt changes after each command to indicate a new command mode: 

VG> enable

Password: <enable password>

VG# configure terminal

VG(config)# interface serial 0/0

VG(config-if)# line 0

VG(config)# exit

VG#

%SYS-5-CONFIG_I: Configured from console by console

The last message is normal and does not indicate an error. Press Return to get the VG# prompt.

Note You can press Ctrl-Z in any mode to immediately return to enable mode (VG#), instead of entering exit, which returns you to the previous mode.

Undoing a Command or Feature

If you want to undo a command you entered or disable a feature, enter the keyword no before most commands; for example, no ip routing.

Saving Configuration Changes

You need to enter the copy running-config startup-config command to save your configuration changes to NVRAM, so the changes are not lost if there is a system reload or power outage. For example: 

VG# copy running-config startup-config

Building configuration...

It might take a minute or two to save the configuration to NVRAM. After the configuration has been saved, the following appears: 

[OK]

VG#

Upgrading to a New Cisco IOS Release

To install or upgrade to a new Cisco IOS release, see Maintaining System Memory in the Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2.

Note To simplify network operations and management of Cisco IOS software migration, see the Basics of a Successful Cisco IOS Software Migration document.

Cisco VG202 and Cisco VG204 Voice Gateways Deployment Scenario

Figure 1-5 shows a typical deployment scenario for Cisco VG202 and Cisco VG204 voice gateways.

Figure 1-5 Analog FXS User Interfaces

1

Ethernet

2

VG204 voice gateway

3

RJ-11 cables

4

Analog telephones


Where to Go Next

Now that you have learned some Cisco IOS software basics and seen a typical deployment scenario, you can begin to configure the VG by using the command-line interface (CLI).

Remember that:

•You can use the question mark (?) and arrow keys to help you enter commands.

•Each command mode restricts you to a set of commands. If you have difficulty entering a command, check the prompt and then enter the question mark (?) for a list of available commands. You might be in the wrong command mode or be using the wrong syntax.

•To disable a feature, generally enter the keyword no before the command; for example, no ip routing.

•You need to save your configuration changes to NVRAM so that the changes are not lost if there is a system reload or power outage.

Go to Chapter 2, "Using the setup Command Facility," to begin configuring the VG.