Table of Contents

Configuring the Host Name and Password

Verifying the Host Name and Password

Configuring 1-Port and 2-Port Ethernet Interfaces
Configuring Fast Ethernet Interfaces
Configuring Asynchronous/Synchronous Serial Network Modules or WAN Interface Cards
Configuring 16-Port and 32-Port Asynchronous Network Modules
Configuring ISDN BRI WAN Interface Cards

Configuring ISDN BRI Lines

ISDN BRI Provisioning by Switch Type
Defining ISDN Service Profile Identifiers

Configuring T1 and E1 Interfaces

Configuring T1 Interfaces
Configuring E1 Interfaces
Configuring TDM Connect (Data Pass-Through)
Configuring Codec Complexity

Configuring T1 (FT1) WAN Interface Cards

Default Configuration

Configuring ATM Interfaces

Configuring PVCs
Configuring SVCs

Configuring Inverse Multiplexing for ATM Interfaces

Configuring the ATM T1/E1 Interface
Configuring the IMA Interface
Checking the IMA Configuration

Configuring Analog Modem Interfaces

Checking the Modem Configuration

Checking the Interface Configuration
Saving Configuration Changes
Where to Go Next

Configuring with the Command-Line Interface

This chapter describes how to use the Cisco IOS software command-line interface (CLI) to configure basic router functionality, including:

• Configuring the Host Name and Password

• Configuring 1-Port and 2-Port Ethernet Interfaces

• Configuring Fast Ethernet Interfaces

• Configuring Asynchronous/Synchronous Serial Network Modules or WAN Interface Cards

• Configuring 16-Port and 32-Port Asynchronous Network Modules

• Configuring ISDN BRI WAN Interface Cards

• Configuring T1 and E1 Interfaces

• Configuring T1 (FT1) WAN Interface Cards

• Configuring ATM Interfaces

• Configuring Inverse Multiplexing for ATM Interfaces

• Configuring Analog Modem Interfaces

• Checking the Interface Configuration

• Saving Configuration Changes

• Where to Go Next

Follow the procedures in this chapter to configure the router manually or if you want to change the configuration after you have run the setup command facility (described in Chapter 1,"First-Time Configuration").

This chapter does not describe every configuration possible---only a small portion of the most commonly used configuration procedures. For advanced configuration topics, refer to the Cisco IOS configuration guide and command reference publications. These publications are available on the Documentation CD-ROM that came with your router, on the World Wide Web from Cisco's home page, or you can order printed copies separately.

Configuring the Host Name and Password

One of the first configuration tasks you might want to do is configure the host name and set an encrypted password. Configuring a host name allows you to distinguish multiple Cisco routers from each other. Setting an encrypted password allows you to prevent unauthorized configuration changes.

Table 3-1: Configuring the Host Name and Password

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router(config)# hostname Router Router(config)#	Change the name of the router to a meaningful name. Substitute your host name for Router.
4	Router(config)# enable secret guessme	Enter an enable secret password. This password provides access to privileged EXEC mode. When a user types enable at the EXEC prompt (Router> ), they must enter the enable secret password to gain access to configuration mode. Substitute your enable secret for guessme.
5	Router(config)# line con 0 Router(config-line)# exec-timeout 0 0 Router(config-line)# exit Router(config)#	Enter line configuration mode to configure the console port. When you enter line configuration mode, the prompt changes to Router(config-line)#. Prevent the router's EXEC facility from timing out if you do not type any information on the console screen for an extended period. Exit back to global configuration mode.

Verifying the Host Name and Password

To verify that you configured the correct host name and password:

• Enter the show config command:

Router(config)# show config
Using 1888 out of 126968 bytes
!
version XX.X
.
.
.
!
hostname Router
!
enable secret 5 $1$60L4$X2JYOwoDc0.kqa1loO/w8/
.
.
.
 

Check the host name and encrypted password displayed near the top of the command output.

• Exit global configuration mode and attempt to re-enter it using the new enable password:

Router# exit
.
.
.
Router con0 is now available
Press RETURN to get started.
Router> enable
Password: guessme
Router# 

Tips

If you are having trouble, check the following:

• Caps Lock is off.

• You entered the correct passwords. Passwords are case sensitive.

Configuring 1-Port and 2-Port Ethernet Interfaces

You can configure Ethernet interfaces manually by entering Cisco IOS commands on the command line. This method, called configuration mode, provides the greatest power and flexibility.

TimeSaver Before you begin, disconnect all WAN cables from the router to keep it from trying to run the AutoInstall process. The router tries to run AutoInstall whenever you power it ON, if there is a WAN connection on both ends and the router does not have a valid configuration file stored in nonvolatile random-access memory (NVRAM) (for instance, when you add a new interface). It can take several minutes for the router to determine that AutoInstall is not connected to a remote Transmission Control Protocol/Internet Protocol (TCP/IP) host.

Before you begin configuring the Ethernet interface, make sure you:

• Connect a console to the router.

• Power on the router.

Table 3-2: Configuring 1-Port and 2-Port Ethernet Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface ethernet 0/0 Router(config-if)#	Enter the interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ip address 172.16.74.3 255.255.255.0	Assign the IP address and subnet mask to the interface.
6	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
7	Router(config-if)# exit	Exit back to global configuration mode. Repeat Step 4 through Step 6 if your router has more that one LAN interface that you need to configure.
8	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring Fast Ethernet Interfaces

To configure a Fast Ethernet interface, use the configuration software provided with your router or network module, if any. Otherwise, for greatest power and flexibility use configuration mode (manual configuration). In this mode, you enter Cisco IOS commands at the router prompt.

This section describes basic configuration, including enabling the interface and specifying IP routing. Depending on your own requirements and the protocols you plan to route, you might also need to enter other configuration commands.

Before you begin configuring the interfaces, make sure you:

• Connect a console to the router.

• Power on the router.

Table 3-3: Configuring Fast Ethernet Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface fastethernet 0/0 Router(config-if)#	Enter interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ip address 172.16.74.3 255.255.255.0	Assign an IP address and subnet mask to the interface.
6	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
7	Router(config-if)# exit	Exit back to global configuration mode. Repeat Step 4 through Step 6 if your router has more than one interface that you need to configure.
8	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring Asynchronous/Synchronous Serial Network Modules or WAN Interface Cards

You can configure the serial interfaces on your asynchronous/synchronous serial network module or WAN interface card manually by entering Cisco IOS commands on the command line. This method, called configuration mode, provides the greatest power and flexibility.

TimeSaver Before you begin, disconnect all WAN cables from the router to keep it from trying to run the AutoInstall process. The router tries to run AutoInstall whenever you power it ON, if there is a WAN connection on both ends and the router does not have a valid configuration file stored in nonvolatile random-access memory (NVRAM) (for instance, when you add a new interface). It can take several minutes for the router to determine that AutoInstall is not connected to a remote Transmission Control Protocol/Internet Protocol (TCP/IP) host.

Before you begin configuring the asynchronous/synchronous serial interface, make sure you:

• Connect a console to the router.

• Power on the router.

Table 3-4: Configuring Asynchronous/Synchronous Serial Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface serial 0/0 Router(config-if)#	Enter the interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ip address 172.16.74.1 255.255.255.0	Assign the IP address and subnet mask to the interface.
6	Router(config-if)# appletalk static cable-range 5-5 Router(config-if)# appletalk zone ZZSerial Router(config-if)# ipx network B003	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
7	Router(config-if)# physical-layer async	All serial ports are initially configured as synchronous. Enter this command if you want to configure the port as asynchronous.
8	Router(config-if)# async mode dedicated Router(config-if)# async default routing	Configure asynchronous parameters according to your needs.
9	Router(config-if)# line async <#>	Configure the asynchronous line setting.
10	Router(config-if)# half-duplex timer dcd-drop-delay 100	Specify the time that the interface waits in controlled carrier mode. See Table 3-5 for a list of half-duplex timer commands.
11	Router(config-if)# clockrate 7200	To use a port in DCE mode, connect a DCE cable and set the internal transmit clock signal (TXC) speed in bits per second. See Table 3-6 through Table 3-9 for a list of clock rate settings for your specific interface. (For ports used in DTE mode, the router automatically uses the external timing signal.)
12	Router(config-if)# dce-terminal-timing-enable	When a port is operating in DCE mode, the default operation is for the DCE to send serial clock transmit (SCT) and serial clock receive (SCR) clock signals to the DTE, and for the DTE to return a serial clock transmit external (SCTE) signal to the DCE. If the DTE does not return SCTE, enter this command to configure the DCE port to use its own clock signal.
13	Router(config-if)# invert-txc	Routers that use long cables might experience high error rates when operating at higher transmission speeds, because the clock and data signals can shift out of phase. If a DCE port is reporting a high number of error packets, inverting the clock using this command can often correct the shift.
14	Router(config-if)# nrzi-encoding	All serial interfaces support both nonreturn to zero (NRZ) and nonreturn to zero inverted (NRZI) formats. NRZ is the default; NRZI is commonly used with EIA/TIA-232 connections in IBM environments. To enable NRZI encoding on an interface, enter this command.
15	Router(config-if)# exit	Exit back to global configuration mode. Repeat Step 4 through Step 14 if your router has more that one serial interface that you need to configure.
16	Router(config)# Ctrl-z Router#	When you finish configuring interface, return to enable mode.

Table 3-5: Half-Duplex Timer Commands

Timer	Syntax	Default Setting (Milliseconds)
CTS delay1	half-duplex timer cts-delay	100
CTS drop timeout	half-duplex timer cts-drop-timeout	5000
DCD drop delay	half-duplex timer dcd-drop-delay	100
DCD transmission start delay	half-duplex timer dcd-txstart-delay	100
RTS2 drop delay	half-duplex timer rts-drop-delay	100
RTS timeout	half-duplex timer rts-timeout	2000
Transmit delay	half-duplex timer transmit-delay	0

1CTS = Clear To Send. 2RTS = Request To Send.

Configuring 16-Port and 32-Port Asynchronous Network Modules

You can configure the asynchronous interface manually by entering Cisco IOS commands on the command line. This method, called configuration mode, provides the greatest power and flexibility.

TimeSaver Before you begin, disconnect all WAN cables from the router to keep it from trying to run the AutoInstall process. The router tries to run AutoInstall whenever you power it ON, if there is a WAN connection on both ends and the router does not have a valid configuration file stored in nonvolatile random-access memory (NVRAM) (for instance, when you add a new interface). It can take several minutes for the router to determine that AutoInstall is not connected to a remote Transmission Control Protocol/Internet Protocol (TCP/IP) host.

Before you begin configuring the asynchronous interface, make sure you:

• Connect a console to the router.

• Power on the router.

Table 3-10: Configuring Asynchronous Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface async 45 Router(config-if)#	Enter the interface configuration mode and specify the asynchronous interface to configure. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ip address 172.16.74.1 255.255.255.0	Assign the IP address and subnet mask to the interface.
6	Router(config-if)# appletalk static cable-range 5-5 Router(config-if)# appletalk zone ZZAsync Router(config-if)# ipx network B003	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
7	Router(config-if)# async mode dedicated Router(config-if)# async default routing Router(config-if)# line async 45 Router(config-if)# speed 115200	Configure asynchronous parameters according to your needs.
8	Router(config-if)# exit	Return to the global configuration mode and repeat Step 4 through Step 7 if your router has more than one interface that you need to configure.
9	Router(config-if)# Ctrl-z Router#	Return to enable mode.

Configuring ISDN BRI WAN Interface Cards

You can configure the interfaces on your BRI WAN interface card manually by entering Cisco IOS commands on the command line. This method, called configuration mode, provides the greatest power and flexibility.

TimeSaver Before you begin, disconnect all WAN cables from the router to keep it from trying to run the AutoInstall process. The router tries to run AutoInstall whenever you power it ON, if there is a WAN connection on both ends and the router does not have a valid configuration file stored in nonvolatile random-access memory (NVRAM) (for instance, when you add a new interface). It can take several minutes for the router to determine that AutoInstall is not connected to a remote Transmission Control Protocol/Internet Protocol (TCP/IP) host.

Before you begin configuring the BRI interface, make sure you:

• Connect a console to the router.

• Power ON the router.

Table 3-11: Configuring BRI Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router(config)# isdn switch-type basic-5ess	Enter an ISDN switch type. See Table 3-12 for a list of ISDN switch types. Note Switch types configured in interface configuration mode override this setting for the configured interface.
4	Router(config)# ip routing Router(config)# appletalk routing Router(config)# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
5	Router(config)# interface bri 0/0 Router(config-if)#	Enter the interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
6	Router(config-if)# ip address 172.16.74.2 255.255.255.0 Router(config-if)# isdn switch-type basic-5ess	Assign the IP address and subnet mask to the interface. If you are configuring this interface for voice, enter the switch type instead of an IP address.
7	Router(config-if)# appletalk static cable-range 5-5 Router(config-if)# appletalk zone ZZBRI Router(config-if)# ipx network B004 Router(config-if)# isdn incoming-voice modem	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface. If you are configuring this router for voice, use the isdn incoming-voice modem command.
8	Router(config-if)# exit	Exit back to global configuration mode. Repeat Step 5 through Step 7 if your router has more than one BRI interface that you need to configure.
9	Router(config-if)# memory-size iomem 40	By default, the router allocates 25 percent of DRAM to shared memory (used for data transmitted or received by network modules and WAN interface cards). If your router includes 16 or more ISDN BRI interfaces, you must increase the amount of shared memory by entering the memory-size iomem command. This example increases shared memory from 25 percent to 40 percent.
10	Router(config)# Ctrl-z Router#	When you finish configuring interface, return to enable mode.

Configuring ISDN BRI Lines

Before using a router with an ISDN BRI interface, you must order a correctly configured ISDN BRI line from your local telecommunications service provider.

The ordering process varies from provider to provider and from country to country; however, here are some general guidelines:

• Ask for two channels to be called by one number.

• Ask for delivery of calling line identification, also known as caller ID or Automatic Number Identification (ANI).

• If the router will be the only device attached to the ISDN BRI line, ask for point-to-point service and a data-only line.

• If you plan to connect another ISDN device (such as an ISDN telephone) to the ISDN BRI line through the router, ask for point-to-multipoint service (subaddressing is required) and a voice-and-data line.

ISDN BRI Provisioning by Switch Type

ISDN BRI provisioning refers to the types of services provided by the ISDN BRI line. Although provisioning is performed by your ISDN BRI service provider, you must tell the provider what you want. Table 3-13 lists the provisioning you should order for your router.

Table 3-13: ISDN Provisioning by Switch Type

Switch Type	Provisioning
5ESS Custom BRI	For data only: 2 B channels for data Point to point Terminal type = E 1 directory number (DN) assigned by service provider MTERM = 1 Request delivery of calling line ID on Centrex lines Set speed for ISDN calls to 56 kbps outside local exchange
5ESS Custom BRI	For voice and data: (Use these values only if you have an ISDN telephone connected.) 2 B channels for voice or data Multipoint Terminal type = D 2 directory numbers assigned by service provider 2 service profile (SPIDs) required, assigned by service provider MTERM = 2 Number of cal appearances = 1 Display = No Ringing/idle call appearances = 1 Autohold = no Onetouch = no Request delivery of calling line ID on Centrex lines Set speed for ISDN calls to 56 kbps outside local exchange Directory number 1 can hunt to directory number 2
5ESS National ISDN (NI-1) BRI	Terminal type = A 2 B channels for voice or data 2 directory numbers assigned by service provider 2 SPIDs required, assigned by service provider Set speed for ISDN calls to 56 kbps outside local exchange Directory number 1 can hunt to directory number 2
DMS-100 BRI	2 B channels for voice or data 2 directory numbers assigned by service provider 2 SPIDs required, assigned by service provider Functional signaling Dynamic terminal endpoint identifier (TEI) assignment Maximum number of keys = 64 Release key = no, or key number = no Ringing indicator = no EKTS = no PVC = 2 Request delivery of calling line ID on Centrex lines Set speed for ISDN calls to 56 kbps outside local exchange Directory number 1 can hunt to directory number 2

Defining ISDN Service Profile Identifiers

Some service providers assign service profile identifiers (SPIDs) to define the services to which an ISDN device subscribes. If your service provider requires SPIDs, your ISDN device cannot place or receive calls until it sends a valid SPID to the service provider when initializing the connection. A SPID is usually a seven-digit telephone number plus some optional numbers, but service providers might use different numbering schemes. SPIDs have significance at the local access ISDN interface only; remote routers are never sent the SPID.

Currently, only DMS-100 and NI-1 switch types require SPIDs. Two SPIDs are assigned for the DMS-100 switch type, one for each B channel. The AT&T 5ESS switch type might support SPIDs, but Cisco recommends that you set up that ISDN service without SPIDs.

If your service provider assigns you SPIDs, you must define these SPIDs on the router. To define SPIDs and the local directory number (LDN) on the router for both ISDN BRI B channels, use the following isdn spid commands:

Router (config-if)# isdn spid1 spid-number [ldn]
Router (config-if)# isdn spid2 spid-number [ldn]

For further information on configuring ISDN, see the chapters "Configuring ISDN" and "Configuring DDR" in the Wide-Area Networking Configuration Guide publication.

Configuring T1 and E1 Interfaces

To configure an ISDN PRI interface or T1/E1 multiflex trunk interface, use the configuration software provided with your router or network module, if any. Otherwise, for greatest power and flexibility use configuration mode (manual configuration). In this mode, you enter Cisco IOS commands at the router prompt.

This section describes basic configuration, including enabling the interface and specifying IP routing. Depending on your own requirements and the protocols you plan to route, you might also need to enter other configuration commands.

Before you begin configuring the interfaces, make sure you:

• Connect a console to the router.

• Power on the router.

Configuring T1 Interfaces

Use the following procedure to configure a new T1, CT1/PRI or CT1/PRI-CSU interface or to change the configuration of an existing interface.

Table 3-14: Configuring T1 Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# controller t1 1/0	Select the CT1/PRI interface to configure. This example configures a T1 interface in slot 1 and unit 0.
5	Router(config-controller)# clock source line	Specify which end of the circuit provides clocking. The clock source should be set to use internal clocking only for testing the network or if the full T1 line is used as the channel group. Only one end of the T1 line should be set to internal.
6	Router(config-controller)# framing esf	Specify the framing type.
7	Router(config-controller)# linecode b8zs	Specify the line code format.
8	Router(config-controller)# channel-group 0 timeslots 1,3-5,7	Specify the channel group and time slots to be mapped. For multiflex trunk interfaces, only channel 0 can be configured.
9	Router(config-controller)# interface serial 1/0:0	Configure each channel group as a virtual serial interface. Specify the T1 interface, unit number, and channel group to modify.
10	Router(config-if)# ip address 10.1.15.1 255.255.255.0	Assign an IP address and subnet mask to the interface.
11	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
12	Router(config-if)# exit	Exit back to global configuration mode. Return to Step 4 if your router has more than one CT1/PRI interface that you need to configure.
13	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring E1 Interfaces

Use the following procedure to configure a new E1 or CE1/PRI interface (balanced or unbalanced) or to change the configuration of an existing interface.

Table 3-15: Configuring E1 Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# controller e1 1/0	Select the CE1/PRI interface to configure. This example configures an E1 interface in slot 1 and unit 0.
5	Router(config-controller)# framing crc4	Specify the framing type.
6	Router(config-controller)# linecode hdb3	Specify the line code format.
7	Router(config-controller)# channel-group 0 timeslots 1,3-5,7	Specify the channel group and time slots to be mapped. For multiflex trunk interfaces, only channel 0 can be configured.
8	Router(config-controller)# interface serial 1/0:0	Configure each channel group as a virtual serial interface. Specify the E1 interface, unit number, and channel group to modify.
9	Router(config-if)# ip address 10.1.15.1 255.255.255.0	Assign an IP address and subnet mask to the interface.
10	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
11	Router(config-if)# exit	Exit back to global configuration mode. Return to Step 4 if your router has more than one CE1/PRI interface that you need to configure.
12	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring TDM Connect (Data Pass-Through)

For multiflex trunk interfaces using the time-division multiplexing (TDM) connect function, you can use the connect command to connect two groups of DS0 timeslots from two controllers.

Configuring Codec Complexity

The number of channels that an HDV network module can support depends on the number of PVDMs that are installed and the complexity level of the codecs (vocoders) needed to support the required compression method. The HDV network module supports the following number of channels:

Configuring T1 (FT1) WAN Interface Cards

The 1-port T1 and fractional (FT1) WAN interface card includes an integrated data service unit/channel service unit (DSU/CSU) and can be configured either for full T1 service at 1.544 Mbps or for fractionalized T1 service. You can configure the interfaces on your T1 WAN interface card manually by entering Cisco IOS commands on the command line. This method, called configuration mode, provides the greatest power and flexibility.

TimeSaver Before you begin, disconnect all WAN cables from the router to keep it from trying to run the AutoInstall process. The router tries to run AutoInstall whenever you power it ON, if there is a WAN connection on both ends and the router does not have a valid configuration file stored in nonvolatile random-access memory (NVRAM) (for instance, when you add a new interface). It can take several minutes for the router to determine that AutoInstall is not connected to a remote Transmission Control Protocol/Internet Protocol (TCP/IP) host.

Before you begin configuring the BRI interface, make sure you:

• Connect a console to the router.

• Power on the router.

Default Configuration

The Cisco IOS software provides the following default configuration for CSU/DSU- and T1-specific parameters:

service-module t1 clock source line
service-module t1 data-coding normal
service-module t1 timeslots all speed 64
service-module t1 framing esf
service-module t1 lbo none
service-module t1 linecode b8zs
no service-module t1 remote-alarm-enable
service-module t1 remote-loopback
no service-module t1 fdl
 

To change this configuration, enter commands in configuration mode, as described in the next section. To view the current configuration, enter the show service-module serial slot/port command. For further information about these commands, refer to the Cisco IOS configuration guides and command references.

Table 3-18: Configuring T1 Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface serial 0/0 Router(config-if)#	Enter the interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ip address 172.16.74.2 255.255.255.0	Assign the IP address and subnet mask to the interface.
6	Router(config-if)# no keepalive Router(config-if)# appletalk static cable-range 5-5 Router(config-if)# appletalk zone ZZ Router(config-if)# ipx network B004	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
7	Router(config-if)# service-module t1 framing sf Router(config-if)# service-module t1 linecode ami	Enter the framing type and linecode type. In this example, the framing type specified is sf (Superframe) and the linecode specified is ami.
8	Router(config-if)# service-module t1 timeslots 1-20 speed 64	If you are using fractional T1 service, enter the time slot range and speed. In this example, the time slot range specified is from 1 to 20, and the speed specified is 64 kbps.
9	Router(config-if)# exit	Exit back to global configuration mode. Repeat Step 4 through Step 8 if your router has more than one interface that you need to configure.
10	Router(config)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring ATM Interfaces

To configure an ATM interface, you must use configuration mode (manual configuration). In this mode, you enter Cisco IOS commands at the router prompt.

This section describes basic configuration, including enabling the interface and specifying IP routing. Depending on your own requirements and the protocols you plan to route, you might also need to enter other configuration commands.

Configuring PVCs

To configure the ATM interface with PVCs, follow this procedure:

Table 3-19: Configuring ATM Interfaces with PVCs

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface atm 1/0 Router(config-if)#	Enter interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ip address 192.168.74.3 255.255.255.0	Assign an IP address and subnet mask to the interface.
6	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
7	Router(config-if)# pvc 0/100	Configure a new ATM PVC. Enter interface-ATM-VC configuration mode. The PVC command has the format pvc [name] vpi/vci [ilmi|qsaal] You have entered interface-ATM-VC configuration mode when the prompt changes to Router(config-if-atm-vc).
8	Router(config-if-atm-vc)# protocol ip 200.200.200.2 broadcast	Map the PVC to an address.
9	Router(config-if-atm-vc)# exit	Exit back to global configuration mode. Repeat Step 4 through Step 8 if your router has more than one interface that you need to configure.
10	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring SVCs

To configure the ATM interface with switched virtual circuits (SVCs), follow this procedure:

Table 3-20: Configuring ATM Interfaces with SVCs

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface atm 1/0 Router(config-if)#	Enter interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# pvc 0/5 qsaal	Configure a signaling channel for the SVC.
6	Router(config-if-atm-vc)# exit	Exit back to interface configuration mode.
7	Router(config-if)# pvc 0/6 ilmi	Configure additional signaling channels for the SVC.
8	Router(config-if-atm-vc)# exit	Exit back to interface configuration mode.
9	Router(config-if)# ip address 192.168.74.3 255.255.255.0	Assign an IP address and subnet mask to the interface.
10	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
11	Router(config-if)# svc nsap BC.CDEF.01.234567.890A.BCDE.F012.3456.7890.1234.12	Configure the signaling PVC and the ATM network service access point (NSAP) address. The signaling PVC command has the format svc [name] nasp <20-byte address>. You have entered interface-ATM-VC configuration mode when the prompt changes to Router(config-if-atm-vc).
12	Router(config-if-atm-vc)# protocol ip 200.200.200.2 broadcast	Map the PVC to an address.
13	Router(config-if-atm-vc)# exit	Exit back to global configuration mode. Repeat Step 4 through Step 12 if your router has more than one interface that you need to configure.
14	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring Inverse Multiplexing for ATM Interfaces

To configure an inverse multiplexing for ATM (IMA) interface, you must use configuration mode (manual configuration). In this mode, you enter Cisco IOS commands at the router prompt.

This section describes basic configuration, including enabling the interface and specifying IP routing. Depending on your own requirements and the protocols you plan to route, you might also need to enter other configuration commands.

Configuring the ATM T1/E1 Interface

To configure the ATM interface, follow this procedure:

Table 3-21: Configuring ATM T1/E1 Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface atm 1/0 Router(config-if)#	Enter interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ima clock line	Enter the transmit clock mode for the selected ATM interface. The choices are internal, line, or loop. The default is line.
6	Router(config-if)# cablelength short 133	For T1 interfaces only, specify the cable length (short or long) followed by the length in feet. You can view the acceptable cable lengths by including the ? option after the long or short commands.
7	Router(config-if)# loopback local	Specify the loopback type for this ATM interface by entering the loopback command followed by one of the following: line, local, payload, remote. You can view command descriptions by including the ? option after the loopback command.
8	Router(config-if)# impedance 120-ohm	For E1 interfaces only, specify the impedance value for this ATM interface by entering the impedance command followed by one of the following: 120-ohm, 75-ohm. You can view command descriptions by including the ? option after the impedance command. Note Your response must match the physical cable connected to the ATM port: Enter 75 ohm for coaxial unbalanced cable, or 120 ohm for twisted-pair balanced cable. A response of no impedance selects the default of 120 ohm.
9	Router(config-if)# no shutdown	Enable the ATM interface by canceling the shutdown state.
10	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Configuring the IMA Interface

To configure the IMA interface, follow this procedure:

Table 3-22: Configuring IMA Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface atm 1/0 Router(config-if)#	Enter interface configuration mode. You have entered interface configuration mode when the prompt changes to Router(config-if)#.
5	Router(config-if)# ima-group 2	Assign the ATM interface to an IMA group (numbered from 0 to 3). The interface is now assigned to a group and ATM functionality is no longer available for the individual link.
6	Router(config-if)# no shutdown	Enable the individual link by canceling the shutdown state. Note The no shutdown command at this point activates the individual ATM link. If this command is omitted, the ATM link is added to the group but is "inhibited" at the IMA protocol level. This would prevent it from carrying network traffic. Repeat Step 4 through Step 6 if your router has more than one interface that you need to configure.
7	Router(config-if)# interface atm2/ima3	Create the IMA group interface. Note The group interface is deleted with the no interface atm 2/ima 3 command.
8	Router(config-if)# ima clock-mode common	Select the transmit clock mode for the selected IMA group. The choices are common or independent.
9	Router(config-if)# ima differential-delay-maximum 75	Enter the maximum differential delay in milliseconds for the selected IMA group.
10	Router(config-if)# ima active-links-minimum 2	Enter the minimum number of links that need to be operational for the selected IMA group.
11	Router(config-if)# ima test link 4	Select the test port for the selected IMA group. The link number is one of the physcial ports on the network module.
12	Router(config-if)# ip address 192.168.74.3 255.255.255.0	Assign an IP address and subnet mask to the interface.
13	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
14	Router(config-if)# no shutdown	Enable the IMA group by canceling the shutdown state.
15	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Checking the IMA Configuration

After configuring the new IMA interface, you can perform the following tests to verify that the new interface is operating correctly:

• Enter the show ima interface atm1/3 command to verify information for the specified IMA group.

• Enter the show controllers atm0/ima2 command to display IMA diagnostic information for the specified group.

If an interface is down and you configured it as up, or if the displays indicate that the hardware is not functioning properly, make sure that the new interface is properly connected and configured. To check other parts of the configuration, refer to the "Checking the Interface Configuration" section.

Configuring Analog Modem Interfaces

To configure an analog modem interface, use the configuration software provided with your router or modem network module, if any. Otherwise, use configuration mode (manual configuration). In this mode, you enter Cisco IOS commands at the router prompt.

This section describes basic configuration, including enabling the interface and specifying IP routing. Depending on your own requirements and the protocols you plan to route, you might also need to enter other configuration commands.

Before you begin configuring the interfaces, make sure you:

• Connect a console to the router.

• Power ON the router.

Table 3-23: Configuring Analog Modem Interfaces

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#	Enter global configuration mode. You have entered global configuration mode when the prompt changes to Router(config)#.
3	Router# ip routing Router# appletalk routing Router# ipx routing	Enable routing protocols as required for your global configuration. This example uses IP routing, AppleTalk routing, and Internetwork Packet Exchange (IPX) routing.
4	Router(config)# interface async 45 Router(config-if)#	You can configure asynchronous interfaces either individually or as a group. This command selects an individual interface to configure. (To configure a group, see Step 6.) The prompt changes to Router(config-if)#.
5	Router(config-if)# ip address 172.16.74.1 255.255.255.0	Assign an IP address and subnet mask to the interface. Continue with Step 10.
6	Router(config)# interface group-async 1	Assign asynchronous interfaces to a group so you can configure them together.
7	Router(config-if)# ip unnumbered ethernet 0	Configure the asynchronous interface group as unnumbered and assign the IP address of the Ethernet interface to the group.
8	Router(config-if)# peer default ip address pool default	Define the pool of addresses at the global level.
9	Router(config-if)# group-range 1 16	Define the group range of the interface. This command defines the range as all modems in slot 0.
10	Router(config-if)# appletalk static cable-range 3-3 Router(config-if)# appletalk zone ZZEth Router(config-if)# ipx network B005	Configure routing protocols on the interface or group. You must have previously enabled these protocols as part of global configuration. In this example, AppleTalk and IPX are being configured on the interface.
11	Router(config-if)# async mode interactive Router(config-if)# async default routing Router(config-if)# encapsulation ppp Router(config-if)# ppp authentication chap pap	Configure asynchronous parameters according to your needs.
12	Router(config-if)# exit	Exit back to global configuration mode. Return to Step 4 if your router has more than one interface that you need to configure.
13	Router(config)# modem country microcom_hdms country-name	Set modem parameters (including encoding) to the correct country. Table 3-24 shows country codes. The default is usa.
14	Router(config-if)# line 1 16	Enter the modem line or range of modem lines to configure.
15	Router(config-line)# transport input all	Allow all protocols to be used when connecting to the line.
16	Router(config-line)# autoselect ppp	Enable remote IP users running a PPP application to dial in, bypass the EXEC facility, and connect directly to the network.
17	Router(config-line)# modem inout	Enable incoming and outgoing calls.
18	Router(config-if)# Ctrl-z Router#	When you finish configuring interfaces, return to enable mode.

Table 3-24: Modem Country Codes

Country	Code	Country	Code
Argentina	argentina	Japan	japan
Australia	australia	Korea	korea
Austria	austria	Malaysia	malaysia
Belgium	belgium	Mexico	mexico
Brazil	brazil	Netherlands	netherlands
Canada	canada	New Zealand	new-zealand
Chile	chile	Norway	norway
China	china	Peru	peru
Columbia	columbia	Philippines	philippines
Czech/Slovak Republic	czech-republic	Poland	poland
Denmark	Denmark	Portugal	portugal
Finland	Finland	Saudi Arabia	saudi-arabia
France	France	Singapore	singapore
Germany	Germany	South Africa	south-africa
Greece	Greece	Spain	spain
Hong Kong	hong-kong	Sweden	sweden
Hungary	hungary	Switzerland	switzerland
India	india	Taiwan	taiwan
indonesia	indonesia	Thailand	thailand
Ireland	ireland	United Kingdom	united-kingdom
Israel	israel	USA	usa
Italy	italy

Checking the Modem Configuration

After configuring the new modem interface, you can perform the following tests to verify that the new interface is operating correctly:

• Enter the show interface async command to verify your group interface configuration.

• Enter the show line command to display a summary for all modem lines.

• Enter the show line number command to display a summary for a single modem line.

If an interface is down and you configured it as up, or if the displays indicate that the hardware is not functioning properly, make sure that the new interface is properly connected and configured. To check other parts of the configuration, refer to the following section, "Checking the Interface Configuration."

Checking the Interface Configuration

After configuring the new interface, you can perform the following tests to verify that the new interface is operating correctly:

• Display the router hardware configuration with the show version command. Check that the list includes the new interface.

• Display all network modules and their interfaces with the show controllers command.

• Specify an interface with the show interfaces [type slot/port] command and verify that the first line of the display shows the interface with the correct slot and port number, and that the interface and line protocol are in the correct state, up or down.

• Display the protocols configured for the entire router and for individual interfaces with the show protocols command. If necessary, return to configuration mode to add or remove protocol routing on the router or its interfaces.

• Display the running configuration with the show running-config command, and the configuration stored in NVRAM using the show startup-config command.

• Use the ping command to send an echo request to a specified IP address. Each returned signal is displayed as an exclamation point (!) on the console; each signal that is not returned before the timeout is displayed as a period (.). A series of exclamation points (!!!!!) indicates a good connection; a series of periods (.....) or the message "timed out" or "failed" indicate that the connection failed.

Saving Configuration Changes

To prevent the loss of the router configuration, save it to NVRAM.

Table 3-25: Saving Configuration Changes

Step	Command	Purpose
1	Router> enable Password: <password> Router#	Enter enable mode. Enter the password. You have entered enable mode when the prompt changes to Router#.
2	Router# copy running-config startup-config	Save the configuration changes to NVRAM so that they are not lost during resets, power cycles, or power outages.
3	Router(config-if)# Ctrl-z Router# %SYS-5-CONFIG_I: Configured from console by console	Return to enable mode. This message is normal and does not indicate an error.

Where to Go Next

At this point you can proceed to the following:

• The Cisco IOS software configuration guide and command reference publications for more advanced configuration topics. These publications are available on the Documentation CD-ROM that came with your router, on the World Wide Web from Cisco's home page, or you can order printed copies.

• For troubleshooting information, refer to the System Error Messages and Debug Command Reference publications.

Posted: Fri Jul 9 14:30:23 PDT 1999
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