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Table of Contents

Configuring the Cisco 3800 ERM

Configuring the Cisco 3800 ERM

This chapter describes how to complete a basic configuration of the Cisco 3800 Expansion Router Module (ERM) and contains the following sections:

This chapter provides enough information to get the Cisco 3800 ERM up and running. Detailed software configuration information is available in the Cisco IOS configuration guide and command reference publications, which are available on the Cisco Documentation CD-ROM.

Accessing the Cisco 3800 ERM Command-Line Interface

To configure the Cisco 3800 ERM, you must access the ERM's command-line interface (CLI).

If you will be configuring the ERM on site, connect a console terminal (an ASCII terminal or a PC running terminal emulation software) to the console port (see Figure 3-6) on your Cisco 3800 ERM.

For remote access, connect a modem to the auxiliary port on the Cisco 3800 ERM (see Figure 3-7).

Booting the Cisco 3800 ERM for the First Time

Note To power cycle the Cisco 3800 ERM, turn off the Cisco 3800 system, wait five seconds, then turn it on again. Note that turning off the Cisco 3800 chassis will affect other installed cards. Alternatively, you can turn off the Cisco 3800 system, remove and reinstall the ERM, and turn on the Cisco 3800 system again.

Each time you turn on power to the Cisco 3800 ERM, it goes through the following boot sequence:


  1. The Cisco 3800 ERM goes through power-on self-test diagnostics to verify basic operation of the CPU, memory, and interfaces.

  2. The system bootstrap software (boot image) executes and searches for a valid Cisco IOS image (the Cisco 3800 ERM operating system software). The source of the Cisco IOS image (Flash memory or a Trivial File Transfer Protocol [TFTP] server) is determined by the configuration register setting. The factory-default setting for the configuration register is 0x2102, which indicates that the Cisco 3800 ERM should attempt to load a Cisco IOS image from Flash memory.

  3. If after five attempts a valid Cisco IOS image is not found in Flash memory, the Cisco 3800 ERM reverts to boot ROM mode (which is used to install or upgrade a Cisco IOS image).

  4. If a valid Cisco IOS image is found, then the Cisco 3800 ERM searches for a valid configuration file.

  5. If a valid configuration file is not found in NVRAM, the Cisco 3800 ERM runs the System Configuration Dialog so you can configure it manually. For normal Cisco 3800 ERM operation, there must be a valid Cisco IOS image in Flash memory and a configuration file in NVRAM.

The first time you boot the Cisco 3800 ERM, you need to configure the Cisco 3800 ERM interfaces and then save the configuration to a file in NVRAM. Proceed to the next section, "Configuring the Cisco 3800 ERM for the First Time," for configuration instructions.

Configuring the Cisco 3800 ERM for the First Time

You can configure the Cisco 3800 ERM using one of the following procedures, which are described in this section:


  1. Using the System Configuration Dialog--Recommended if you are not familiar with Cisco IOS commands.

  2. Using Configuration Mode--Recommended if you are familiar with Cisco IOS commands.

  3. Using AutoInstall--Recommended for automatic installation if another router running Cisco IOS software is installed on the network. This configuration method must be set up by someone with experience using Cisco IOS software.
Time Saver Obtain the correct network addresses from your system administrator or consult your network plan to determine correct addresses before you begin to configure the Cisco 3800 ERM.

Use the procedure that best meets the needs of your network configuration and level of experience using Cisco IOS software. If you use configuration mode or AutoInstall to configure the Cisco 3800 ERM and you would like a quick review of the Cisco IOS software, refer to the section "Cisco IOS Software Basics" later in this chapter. Otherwise, proceed to the next section, "Using the System Configuration Dialog."

Using the System Configuration Dialog

If you do not plan to use AutoInstall, make sure the serial transition cable is disconnected from the Cisco 3800 ERM. This will prevent the Cisco 3800 ERM from attempting to the run the AutoInstall process. The Cisco 3800 ERM will attempt to run AutoInstall whenever you turn it on if there is a WAN connection on both ends and the Cisco 3800 ERM does not have a configuration file stored in NVRAM. It can take several minutes for the Cisco 3800 ERM to determine that AutoInstall is not connected to a remote TCP/IP host.

If your Cisco 3800 ERM does not have a configuration (setup) file and you are not using AutoInstall, the Cisco 3800 ERM will automatically start the setup command facility. An interactive dialog called the System Configuration Dialog appears on the console screen. This dialog helps you navigate through the configuration process by prompting you for the configuration information necessary for the Cisco 3800 ERM to operate.

Note Many prompts in the System Configuration Dialog include default answers, which are included in square brackets following the question. To accept a default answer, press Return; otherwise, enter your response.

This section gives an example configuration using the System Configuration Dialog. When you are configuring your Cisco 3800 ERM, respond as appropriate for your network.

At any time during the System Configuration Dialog, you can request help by entering a question mark (?) at a prompt.

Before proceeding with the System Configuration Dialog, obtain from your system administrator the node addresses and the number of bits in the subnet field (if applicable) of the Ethernet, Token Ring, and synchronous serial ports.

Take the following steps to configure the Cisco 3800 ERM using the System Configuration Dialog:

Step 1 After connecting a console terminal or modem to the rear panel of the Cisco 3800 ERM and powering ON the Cisco 3800, wait about 30 seconds for messages to be displayed, corresponding to the Cisco IOS release and feature set you selected. The screen displays in this section are for reference only and might not exactly reflect the screen displays on your console. Following is an example of the messages displayed:

Step 2 Press Return or enter yes to begin the configuration process.

Step 3 When the System Configuration Dialog asks whether you want to view the current interface summary, press Return or enter yes:

Step 4 Configure the global parameters. A typical configuration follows:

Step 5 Next, you are prompted to enter an enable secret password. There are two types of privileged-level passwords:

The enable password is used when the enable secret password does not exist. For maximum security, be sure the passwords are different. If you enter the same password for both, the Cisco 3800 ERM will accept your entry, but will display a warning message indicating that you should enter a different password.


Step 6 Enter an enable secret password:

Step 7 Enter the enable and virtual terminal passwords:

Step 8 Press Return to accept Simple Network Management Protocol management, or enter no to refuse it:

Step 9 In the following example, the Cisco 3800 ERM is configured for AppleTalk, IP, and Internetwork Packet Exchange. Configure the appropriate protocols for your Cisco 3800 ERM:

Configuring Ethernet or Token Ring Interfaces

The Ethernet and Token Ring interfaces are configured to allow connection to a LAN. To configure the interface parameters, you need to know your Ethernet or Token Ring interface network addresses.

Take the following steps to configure an Ethernet or Token Ring interface to allow communication over a LAN:

Step 1 Press Return or enter yes to configure the LAN interface:

Step 2 Determine which protocols you want to support on the LAN interface and enter the appropriate responses. In the following example, the system is configured for IP, AppleTalk, and IPX:

Step 3 If the Token Ring interface on your Cisco 3800 ERM will be utilized, repeat this procedure to configure the second LAN interface.

Configuring the Synchronous Serial Interface

The synchronous serial interface is configured to allow connection to a WAN via the Cisco 3800 Combo card. After the Ethernet or Token Ring ports on your Cisco 3800 ERM have been configured, take the following steps to configure the synchronous serial interface:

Step 1 Press Return or enter yes to configure serial port 0:

Step 2 Determine which protocols you want on the synchronous serial interface and enter the appropriate responses. In the following example, the system is configured for IP, AppleTalk, and IPX:

Step 3 The configuration you entered is now displayed and you are asked if you want to use the displayed configuration. If you enter no, you will lose the configuration information you just entered and can begin the configuration again. If you enter yes, the configuration will be entered and saved in the startup configuration:

Using Configuration Mode

You can configure the Cisco 3800 ERM manually if you prefer not to use AutoInstall or the prompt-driven System Configuration Dialog.

Note Refer to the section "Cisco IOS Software Basics" later in this chapter for basic information about Cisco IOS software, getting context-sensitive help, and saving configuration changes.

Take the following steps to configure the Cisco 3800 ERM manually:

Step 1 Connect a console terminal by following the instructions described in the section "Connecting a Terminal or PC to the ERM Console Port" in the chapter "Installing the Cisco 3800 ERM," and then power ON the Cisco 3800 ERM.

Step 2 When you are prompted to enter the initial dialog, enter no to go into the normal operating mode of the Cisco 3800 ERM:

Step 3 After a few seconds you will see the user EXEC prompt (Router>). By default, the host name is Router, but the prompt will match the current host name. In the following examples, the host name is 3800-ERM. Enter the enable command to enter enable mode. You can only make configuration changes in enable mode:

The prompt will change to the privileged EXEC (enable) prompt, 3800-ERM#.


Step 4 Enter the configure terminal command at the enable prompt to enter configuration mode:

You can now enter any changes you want to the configuration. You will probably want to perform the following tasks:


Refer to the Cisco IOS configuration guide and command reference publications for more information about the commands you can use to configure the Cisco 3800 ERM. You can also refer to the Cisco 3800 Series Software Configuration Guide and Command Reference and Cisco 3800 Series Hardware Installation Guide for information about the commands you can use to configure the Cisco 3800 ERM.


Step 5 When you finish configuring the Cisco 3800 ERM, enter the exit command until you return to the privileged EXEC prompt (3800-ERM#).

Step 6 To save the configuration changes to NVRAM, enter the copy running-config startup-config command at the privileged EXEC prompt:

The Cisco 3800 ERM is now configured and will boot with the configuration you entered.


Configuring the Serial Connection to the Combo Card

This section describes a typical Frame Relay configuration.

An example configuration is included in the next section, "Example Frame Relay Configuration." Both the ERM and Combo card configurations are shown. You may want to refer to this example configuration during this procedure.

Take the following steps to configure the ERM for a basic Frame Relay connection, substituting the correct addresses and host names as appropriate for your network:

Step 1 Enter privileged EXEC mode:

Step 2 Enter the configure terminal command to enter global configuration mode.

Step 3 To set Frame Relay encapsulation, enter interface configuration mode and specify the serial interface:

Step 4 Enter the following command to specify the encapsulation method:

Step 5 A static map links a specified next-hop protocol address to a specified DLCI. Static mapping removes the need for Inverse ARP requests; when you supply a static map, Inverse ARP is automatically disabled for the specified DLCI.

To establish static mapping according to your network needs, you need to define the mapping between a next-hop protocol address and the DLCI used to connect to the address. The following are examples for IP and bridging. The active IP addresses and DLCIs will be different for your network:


Step 6 Enter the exit command to exit interface configuration mode.

Step 7 Enter the copy running-config startup-config command to save the configuration to NVRAM.

Example Frame Relay Configuration

This section includes a configuration for the Cisco 3800 ERM and its associated Combo card. The configuration that you put in the ERM must match the configuration you put in the Combo card. In order to establish connectivity between the ERM and the Combo card, the ERM configuration parameters (such as IP address, DLCI, and protocol) must match corresponding parameters in the Combo card configuration.

Configuration for the Cisco 3800 ERM

The following is an example configuration for the Cisco 3800 ERM, which communicates with the Combo card using serial port 0.

3800-ERM# wr t
Building configuration...
Current configuration:
!
version 11.2
service upd-small-servers
service tcp-small-servers
!
hostname 3800-ERM 
!
enable secret 5 $1$bsm3$yMJK8qBBCucYknT3SIsOp/
enable password lab
!
appletalk routing
!
decnet routing 1.2
decnet node-type routing-iv
!
clns routing
ipx routing 0000.0ca0.0077
vines routing 40000002:0001
xns routing 0000.0ca0.0077
frame relay switching
!
interface Ethernet0
  ip address 3.0.0.6 255.0.0.0
  no ip mroute-cache
  appletalk cable-range 30-30 30.173
  appletalk zone zone3
  decnet cost 4
  ipx network 30 encapsulation SNAP
  vines metric 1
  xns network 30
  clns 3800-ERM  iso-igrp
  bridge-group 1
!
interface Serial0
  ip address 6.0.0.2 255.0.0.0
  no ip mroute-cache
  encapsulation frame-relay
  no keepalive
  appletalk cable-range 60-60 60.101
  appletalk zone zone6
  decnet cost 10
  ipx network 60 
  xns network 60
  clns 3800-ERM  iso-igrp
  frame-relay map bridge 16 broadcast CISCO
  frame-relay map clns 16 broadcast CISCO
  frame-relay map decnet 1.4 16 broadcast CISCO
  frame-relay map ip 6.0.0.4 16 broadcast CISCO
  frame-relay map ipx 60.0800.3e01.02aa 16 broadcast CISCO
  frame-relay map xns 60.0800.3e01.02aa 16 broadcast CISCO
  bridge-group 1
!
interface TokenRing0
  ip address 4.0.0.6 255.0.0.0
  no ip mroute-cache
  appletalk cable-range 100-100 100.156
  appletalk zone zoneT
  decnet cost 4
  ipx network 100 encapsulation SNAP
  vines metric 1
  xns network 100
  ring-speed 16
  clns 3800-ERM  iso-igrp
  bridge-group 1
!
3800-ERM  eigrp 2
  network 3.0.0.0
  network 4.0.0.0
  network 6.0.0.0
!
3800-ERM  iso-igrp
  net 47.0004.004d.0001.0000.0c00.3333.00
!
ip default-gateway 6.0.0.4
no ip classless
ip route 128.0.0.0  255.0.0.0  6.0.0.4
no logging console
!
!
!
!
!
!
snmp-server community public RW 1
bridge 1 protocol ieee
!
line con 0
  exec-timeout 0 0
line aux 0
  transport input all
line vty 0 4
  exec-timeout 0 0
  password lab
  login
!
end
3800-ERM #

Configuration for the Combo Card

The following is an example configuration of the Combo card. For a detailed description of the Combo card configuration, refer to the publication Cisco 3800 Series Software Configuration and Command Reference. In the following configuration, serial 0/2 is connected to the ERM while serial 0/3 is used to connect to an external WAN. (Your connections may vary for your configuration.)

COMBO# wr t
Building configuration...
Current configuration:
!
version 11.2
no service udp-small-servers
no service tcp-small-servers
!
hostname COMBO
!
enable secret 5 $1$Je7A$9jfl.1I43Q2ExrtaR3Ndyl
enable password poPPee
!
frame-relay switching 
appletalk routing
!
decnet routing 1.4
decnet node-type routing-iv
!
clns routing
ipx routing 0800.3e01.02aa
vines routing 40000004:0001
xns routing 0800.3e0l.02aa
!
controller T1 0/0
!
voice-port 0/0
  timing clear-wait 300
!
voice-port 0/1
  timing clear-wait 300
!
interface Ethernet0/0
  ip address 128.10.1.66 255.255.0.0
  no ip mroute-cache
  shutdown
!
interface Serial0/1
  no ip address
  no ip mroute-cache
  shutdown
!
interface Serial0/2
  ip address 6.0.0.4 255.0.0.0
  no ip mroute-cache
  encapsulation frame-relay
  no keepalive
  appletalk cable-range 60-60 60.227
  appletalk zone zone6
  decnet cost 10
  ipx network 60
  xns network 60
  clock rate 2000000
  frame-relay map clns 16 broadcast CISCO
  frame-relay map bridge 16 broadcast CISCO
  frame-relay map ipx 60.0000.0ca0.0077 16 broadcast CISCO
  frame-relay map decnet 1.2 16 broadcast CISCO
  frame-relay map ip 6.0.0.2 16 broadcast CISCO
  frame-relay map xns 60.0000.0ca0.0077 16 broadcast CISCO
  frame-relay intf-type dce
  bridge-group 1
!
interface Serial0/3
  ip address 7.0.0.4 255.0.0.0
  encapsulation ppp
  no keepalive
  appletalk cable-range 70-70 70.19
  appletalk zone zone7
  decnet cost 10
  ipx network 70
  vines metric 1
  xns network 70
  click rate 2000000
  clns 3800-ERM  iso-igrp
  bridge-group 1
!
interface Switch0
  no ip address
  no ip mroute-cache
  encapsulation frame-relay
!
3800-ERM  eigrp 2
  network 6.0.0.0
  network 7.0.0.0
!
3800-ERM 3800-ERM  iso-igrp
  net 47.0004.004d.0001.0000.0c00.4444.00
!
no ip classless
!
!
!
!
!
!
snmp-server community public RW 1
bridge 1 protocol ieee
!
line con 0
line vty 0 4
  password lab
  login
!
end
COMBO#

Using AutoInstall

The AutoInstall process is designed to configure the Cisco 3800 ERM automatically after connection to your WAN via the Combo card. For AutoInstall to work properly, a Transmission Control Protocol/Internet Protocol (TCP/IP) host on your network must be preconfigured to provide the required configuration files. The TCP/IP host can exist anywhere on the network as long as the following two conditions are maintained:


  1. The host must be on the remote side of the Cisco 3800 ERM's synchronous serial connection to the WAN via the Combo card.

  2. User Datagram Protocol (UDP) broadcasts to and from the Cisco 3800 ERM and the TCP/IP host must be enabled.

This functionality is coordinated by your system administrator at the site where the TCP/IP host is located. You should not attempt to use AutoInstall unless the required files have been provided on the TCP/IP host. For more information, refer to the Cisco IOS configuration guide and command reference publications.

Take the following steps to prepare your Cisco 3800 ERM for the AutoInstall process:

Step 1 Attach the special serial transition cable to the Cisco 3800 ERM.

Step 2 Turn ON the Cisco 3800 ERM.

The Cisco 3800 ERM will load the operating system image from Flash memory. If the remote end of the WAN connection is connected to the Combo card and properly configured, the AutoInstall process will begin.


Step 3 If AutoInstall completes successfully, enter the copy running-config startup-config command in privileged EXEC mode to write the configuration data to the Cisco 3800 ERM's NVRAM:

Taking this step saves the configuration settings that the AutoInstall process created to the Cisco 3800 ERM's NVRAM. If you do not do this, the configuration will be lost the next time you reload the Cisco 3800 ERM.


This concludes the initial Cisco 3800 ERM configuration.

Verifying Network Connectivity

When you have installed and configured the Cisco 3800 ERM, you can use the following commands in user EXEC mode to verify network connectivity:

If there is a problem with network connectivity, refer to the section "Reading Front Panel LEDs" in the appendix "Maintaining the Cisco 3800 ERM," and check the cable connections. If there is still a problem, check the Cisco 3800 ERM configuration. Contact customer service for further assistance.

Verifying Connection to Combo Card

To verify the connection to the Combo card, use the ping, telnet, or trace commands:

3800-ERM# ping 172.16.24.9

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.24.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms

3800-ERM# telnet 172.16.24.9
Trying 172.16.24.9 . . . Open

User Access Verification
Username:


3800-ERM# trace 172.16.24.9

Type escape sequence to abort.
Tracing the route to wan-1-2.cisco.com (172.16.24.9)
1. COMBO.cisco.com (172.16.24.9) 4 msec * 4 msec

Specifying the Boot Method

You can enter multiple boot commands in the configuration in NVRAM to provide a backup method for loading the Cisco IOS image onto the Cisco 3800 ERM. The Cisco 3800 ERM boots using the first boot command that succeeds. If you enter multiple boot commands, the Cisco 3800 ERM executes them in the order they are entered. There are two ways to load the Cisco IOS image: from Flash memory or from a TFTP server on the network.


  1. Flash memory
Information stored in Flash memory is not vulnerable to network failures that might occur when you load system software from servers. In the following example, replace filename with the filename of the Cisco IOS image: 
3800-ERM> enable
Password: enablepassword
3800-ERM# configure terminal
3800-ERM (config)# boot system flash filename
3800-ERM (config)# Ctrl-Z
3800-ERM# copy running-config startup-config
Building configuration ...
[OK]
3800-ERM# exit
3800-ERM>

  1. TFTP server
If Flash memory is not available, or if Flash memory does not contain a valid Cisco IOS image, you can specify that system software be loaded from a TFTP server on your network as a backup boot method for the Cisco 3800 ERM. In the following example, replace filename with the filename of the Cisco IOS image, and replace ipaddress with the IP address of the TFTP server: 
3800-ERM> enable
Password: enablepassword
3800-ERM# configure terminal
3800-ERM (config)# boot system tftp filename ipaddress
3800-ERM (config)# Ctrl-Z
3800-ERM# copy running-config startup-config
Building configuration ...
[OK]
3800-ERM# exit
3800-ERM>

Cisco IOS Software Basics

The section provides you with some basic information about the Cisco IOS software and includes the following sections:

Cisco IOS Modes of Operation

Cisco IOS software provides access to several different command modes. Each command mode provides a different group of related commands.

For security purposes, Cisco IOS software provides two levels of access to commands: user and privileged. The unprivileged user mode is called user EXEC mode. The privileged mode is called privileged EXEC mode and requires a password. The commands available in user EXEC mode are a subset of the commands available in privileged EXEC mode.

Table 4-1 describes some of the most commonly used modes, how to enter the modes, and the resulting prompts. The prompt helps you identify which mode you are in and, therefore, which commands are available to you.


Table  4-1: Cisco IOS Operating Modes
Mode of Operation Usage How to Enter the Mode Prompt
User EXEC User EXEC commands allow you to connect to remote devices, change terminal settings on a temporary basis, perform basic tests, and list system information. The EXEC commands available at the user level are a subset of those available at the privileged level. Log in. 3800-ERM>
Privileged EXEC Privileged EXEC commands set operating parameters. The privileged command set includes those commands contained in user EXEC mode, and also the configure command through which you can access the remaining command modes. Privileged EXEC mode also includes high-level testing commands, such as debug. From user EXEC mode, enter the enable EXEC command.

3800-ERM#
Global configuration Global configuration commands apply to features that affect the system as a whole. From global configuration mode, enter the configure privileged EXEC command. 3800-ERM(config)#
Interface configuration Interface configuration commands modify the operation of an interface such as an Ethernet, Token Ring, or serial port. Many features are enabled on a per-interface basis. Interface configuration commands always follow an interface global configu-
ration command, which defines the interface type. 		From global configuration mode, enter the interface type number command. For example, enter the interface serial 0 command to configure the serial 0 interface. 3800-ERM(config-if)#
ROM monitor ROM monitor commands are used to perform low-
level diagnostics. You can also use the ROM monitor commands to recover from a system failure and stop the boot process in a specific operating environment.1 		From privileged EXEC mode, enter the reload EXEC command. Press Break during the first 60 seconds while the system is booting. >

1 You can modify the configuration register value using the config-reg configuration command. Refer to the section "Virtual Configuration Register Settings" in the appendix "Maintaining the Cisco 3800 ERM" for more information.

Almost every configuration command also has a no form. In general, use the no form to disable a feature or function. Use the command without the keyword no to reenable a disabled feature or to enable a feature that is disabled by default. For example, IP routing is enabled by default. To disable IP routing, enter the no ip routing command and enter ip routing to reenable it. The Cisco IOS software command reference publication provides the complete syntax for the configuration commands and describes what the no form of a command does.

Getting Context-Sensitive Help

In any command mode, you can get a list of available commands by entering a question mark (?).

3800-ERM> ?

To obtain a list of commands that begin with a particular character sequence, type in those characters followed immediately by the question mark (?). Do not include a space. This form of help is called word help, because it completes a word for you. 

3800-ERM# co?
configure  connect  copy

To list keywords or arguments, enter a question mark in place of a keyword or argument. Include a space before the question mark. This form of help is called command syntax help, because it reminds you which keywords or arguments are applicable based on the command, keywords, and arguments you have already entered. 

3800-ERM# configure ?
  memory    Configure from NV memory
  network   Configure from a TFTP network host
  terminal  Configure from the terminal
  <cr>

You can also abbreviate commands and keywords by entering just enough characters to make the command unique from other commands. For example, you can abbreviate the show command to sh.

Saving Configuration Changes

Whenever you make changes to the Cisco 3800 ERM configuration, you must save the changes to memory so they will not be lost if there is a system reload or power outage. There are two types of configuration files: the running (current operating) configuration and the startup configuration. The running configuration is stored in RAM; the startup configuration is stored in NVRAM.

To display the current running configuration, enter the show running-config command. Enter the copy running-config startup-config command to save the current running configuration to the startup configuration file in NVRAM.

3800-ERM> enable
3800-ERM# copy running-config startup-config

To display the startup configuration, enter the show startup-config command. Enter the copy startup-config running-config command to write the startup configuration to the running configuration.

3800-ERM> enable
3800-ERM# copy startup-config running-config

To erase both configuration files (and start over), enter the write erase and reload commands:

3800-ERM> enable
3800-ERM# write erase
3800-ERM# reload
Caution This command sequence will erase the entire Cisco 3800 ERM configuration in RAM and NVRAM and reload the Cisco 3800 ERM.

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