Table Of Contents

Configuring WAN Connections

Configuring an Ethernet WAN Connection

Ethernet WAN Connection Reference

WAN Wizard Interface Welcome Window      

Select Interface

IP Address: Ethernet without PPPoE

Encapsulation: PPPoE

Summary   

Advanced Options 

Configuring a Serial Connection

Serial Connection Reference

IP Address: Serial with Point-to-Point Protocol

IP Address: Serial with HDLC or Frame Relay 

Authentication 

Configure LMI and DLCI

Configure Clock Settings

Configuring a DSL Connection

DSL Connection Reference

IP Address: ATM or Ethernet with PPPoE/PPPoA 

IP Address: ATM with RFC 1483 Routing

Encapsulation Autodetect

PVC  

Configuring an ISDN Connection

ISDN Connection Reference

ISDN Wizard Welcome Window

IP Address: ISDN BRI or Analog Modem

Switch Type and SPIDs

Dial String

Configuring an Aux Backup Connection

Aux Backup Connection Reference

Aux Backup Welcome Window

Backup Configuration

Backup Configuration: Primary Interface and Next Hop IP Addresses

Backup Configuration: Hostname or IP Address to Be Tracked

Configuring an Analog Modem Connection

Analog Modem Connection Reference

Analog Modem Welcome

Configuring a Cable Modem Connection

Cable Modem Connection Reference

Cable Modem Connection Wizard Welcome

Select Interface

Summary

Configuring WAN Connections

---

The WAN wizards enable you to configure WAN connections for all Cisco SDM-supported interfaces.

This chapter contains the following sections:

•Configuring an Ethernet WAN Connection

•Configuring a Serial Connection

•Configuring a DSL Connection

•Configuring an ISDN Connection

•Configuring an Aux Backup Connection

•Configuring an Analog Modem Connection

•Configuring a Cable Modem Connection

Configuring an Ethernet WAN Connection

Complete these steps to configure an Ethernet WAN Connection:

---

Step 1 If you want to review the IOS CLI commands that you send to the router when you complete the configuration, go to the Cisco SDM toolbar, and click Edit > Preferences > Preview commands before delivering to router.

Step 2 In the Cisco SDM toolbar, click Configure.

Step 3 In the Cisco SDM taskbar, click Interfaces and Connections.

Step 4 In the Create Connection tab, click Ethernet WAN.

Step 5 Click Create Connection to start the wizard. The wizard Welcome screen describes the tasks you will complete.

Step 6 Click Next to go to the subsequent screens to configure the connection.

Step 7 Cisco SDM displays the Summary screen when you have completed the configuration. Review the configuration. If you need to make changes, click Back to return to the screen in which you need to make changes, then return to the Summary screen.

Step 8 If you want to test the connection after sending the configuration to the router, check Test the connectivity after configuring. After you click Finish, Cisco SDM tests the connection and displays the test results in another screen.

Step 9 To send the configuration to the router, click Finish.

---

The Ethernet WAN Connection Reference describes the screens that Cisco SDM displays.

Ethernet WAN Connection Reference

•WAN Wizard Interface Welcome Window

•Select Interface

•Encapsulation: PPPoE

•IP Address: Ethernet without PPPoE

•IP Address: ATM or Ethernet with PPPoE/PPPoA

•Authentication

•Advanced Options

•Summary

WAN Wizard Interface Welcome Window      

This window lists the types of connections you can configure for this interface using Cisco SDM. If you need to configure another type of connection for this interface, you can do so using the CLI.

Select Interface

This window appears if there is more than one interface of the type you selected in the Create Connection window. Choose the interface that you want to use for this connection.

Field Reference

Table 5-1 describes the fields in this screen.

Table 5-1 Select Interface Fields

Element	Description
Check Boxes	Check the box next to the interface that you want to use for this connection. If you are configuring an Ethernet interface, Cisco SDM inserts the description text $ETH-WAN$ in the configuration file so that it will recognize the interface as a WAN interface in the future.
Enable Dynamic DNS	Click Enable Dynamic DNS if you want to update your DNS servers automatically whenever the WAN interface IP address changes. Click the Dynamic DNS button to configure dynamic DNS. The Enable Dynamic DNS option is not shown for all connection types.

IP Address: Ethernet without PPPoE

Choose the method that the WAN interface will use to obtain an IP address.

Field Reference

Table 5-2 describes the fields in this screen.

Table 5-2 Ethernet without PPPoE IP Address Fields

Element	Description
Static IP Address	If you choose Static IP Address, enter the IP address and subnet mask or the network bits in the fields provided. For more information, see IP Addresses and Subnet Masks.
Dynamic (DHCP Client)	If you choose Dynamic, the router will lease an IP address from a remote DHCP server. Enter the name of the DHCP server that will assign addresses.
Dynamic DNS	Choose dynamic DNS if you want to update your DNS servers automatically whenever the WAN interface IP address changes. Click the Dynamic DNS button to configure dynamic DNS.

Encapsulation: PPPoE

This window lets you enable Point-to-Point-Protocol over Ethernet (PPPoE) encapsulation. This is necessary if your service provider or network administrator requires remote routers to communicate using PPPoE.

PPPoE is a protocol used by many asymmetric digital subscriber line (ADSL) service providers. Ask your service provider if PPPoE is used over your connection.

If you choose PPPoE encapsulation, Cisco SDM automatically adds a dialer interface to the configuration, and this is shown in the Summary window.

Field Reference

Table 5-3 describes the fields in this screen.

Table 5-3 PPoE Encapsulation Fields

Element	Description
Enable PPPoE Encapsulation	If your service provider requires that the router use PPPoE, check this box to enable PPPoE encapsulation. Uncheck this box if your service provider does not use PPPoE. This check box will not be available if your router is running a version of Cisco IOS that does not support PPPoE encapsulation.

Summary   

This screen displays a summary of the WAN link that you configured.You can review this information, and if you need to change anything, you can click the Back button to return to the screen on which you need to make changes.

Button Reference

Table 5-4 describes the buttons in this screen.

Table 5-4 WAN Summary Buttons

Element	Description
Test the connectivity after configuring	Check this box if you want Cisco SDM to test the connection you have configured after it delivers the commands to the router. Cisco SDM will test the connection and report results in another window.

To save this configuration to the router's running configuration and leave this wizard:

Click Finish. Cisco SDM saves the configuration changes to the router's running configuration. The changes will take effect immediately, but will be lost if the router is turned off.

If you checked Preview commands before delivering to router in the Cisco SDM Preferences window, the Deliver window appears. In this window, you can view the CLI commands that you are delivering to the router.

Advanced Options 

There are two advanced options available, based on the router's configuration: Default static route, and Port Address Translation (PAT). If the Static Route option is not visible in the window, a static route has already been configured on the router. If the PAT option is not visible, PAT has already been configured on an interface.

Field Reference

Table 5-5 describes the fields in this screen.

Table 5-5 Advanced Options Fields

Element	Description
Default Static Route	Check this box if you want to configure a static route to the outside interface to which outgoing traffic will be routed. If a static route has already been configured on this router, this box does not appear.
Next Hop Address	If your service provider has given you a next-hop IP address to use, enter the IP address in this field. If you leave this field blank, Cisco SDM will use the WAN interface that you are configuring as the next-hop interface.
Port Address Translation	If devices on the LAN have private addresses, you can allow them to share a single public IP address. You can ensure that traffic goes to its proper destination by using PAT, which represents hosts on a LAN with a single IP address and uses different port numbers to distinguish the hosts. If PAT has already been configured on an interface, the PAT option will not be visible.
Inside Interface to be Translated	Choose the inside interface connected to the network whose host IP addresses you want to be translated.

Configuring a Serial Connection

Complete these steps to configure a Serial connection:

---

Step 1 If you want to review the IOS CLI commands that you send to the router when you complete the configuration, go to the Cisco SDM toolbar, and click Edit > Preferences > Preview commands before delivering to router.

Step 2 In the Cisco SDM toolbar, click Configure.

Step 3 In the Cisco SDM taskbar, click Interfaces and Connections.

Step 4 In the Create Connection tab, click Serial.

Step 5 Click Create Connection to start the wizard. The wizard Welcome screen describes the tasks you will complete.

Step 6 Click Next to go to the subsequent screens to configure the connection.

Step 7 Cisco SDM displays the Summary screen when you have completed the configuration. Review the configuration. If you need to make changes, click Back to return to the screen in which you need to make changes, then return to the Summary screen.

Step 8 If you want to test the connection after sending the configuration to the router, check Test the connectivity after configuring. After you click Finish, Cisco SDM tests the connection and displays the test results in another screen.

Step 9 To send the configuration to the router, click Finish.

---

The Serial Connection Reference describes the screens that Cisco SDM displays.

Serial Connection Reference

•WAN Wizard Interface Welcome Window

•Select Interface

•IP Address: Serial with Point-to-Point Protocol

•IP Address: Serial with HDLC or Frame Relay

•Authentication

•Configure LMI and DLCI

•Configure Clock Settings

•Advanced Options

•Summary

IP Address: Serial with Point-to-Point Protocol

Choose the method that the point-to-point interface will use to obtain an IP address.

Field Reference

Table 5-6 describes the fields in this screen.

Table 5-6 Serial Connection with Point-to-Point Protocol

Element	Description
Static IP Address	If you choose Static IP Address, enter the IP address and subnet mask or the network bits in the fields provided. For more information, see IP Addresses and Subnet Masks.
IP Unnumbered	Choose IP Unnumbered if you want the interface to share an IP address that has already been assigned to another interface. Then choose the interface whose IP address you want to use for the interface you are configuring.
Easy IP (IP Negotiated)	Choose Easy IP (IP Negotiated) if the router will obtain an IP address through PPP/IPCP address negotiation.
Dynamic DNS	Choose dynamic DNS if you want to update your DNS servers automatically whenever the WAN interface IP address changes. Click the Dynamic DNS button to configure dynamic DNS.

IP Address: Serial with HDLC or Frame Relay 

Choose the method that the WAN interface will use to obtain an IP address. If Frame Relay encapsulation is used, Cisco SDM creates a subinterface, and the IP address is assigned to the subinterface Cisco SDM creates.

Field Reference

Table 5-7 describes the fields in this screen.

Table 5-7 Serial Connection with HDLC or Frame Relay Fields

Element	Description
Static IP Address	If you choose Static IP Address, enter the IP address and subnet mask or the network bits in the fields provided. For more information, see IP Addresses and Subnet Masks.
IP Unnumbered	Choose IP Unnumbered if you want the interface to share an IP address that has already been assigned to another interface. Then choose the interface whose IP address you want to use for the interface you are configuring.
Dynamic DNS	Choose dynamic DNS if you want to update your DNS servers automatically whenever the WAN interface IP address changes. Click the Dynamic DNS button to configure dynamic DNS.

Authentication 

This page is displayed if you enabled or are configuring:

•PPP for a serial connection

•PPPoE or PPPoA encapsulation for an ATM connection

•PPPoE or PPPoA encapsulation for an Ethernet connection

•An ISDN BRI or analog modem connection

Your service provider or network administrator may use a Challenge Handshake Authentication Protocol (CHAP) password or a Password Authentication Protocol (PAP) password to secure the connection between the devices. This password secures both incoming and outgoing access.

Field Reference

Table 5-8 describes the fields in this screen.

Table 5-8 Authentication Fields

Element	Description
Authentication Type	Check the box for the type of authentication used by your service provider. If you do not know which type your service provider uses, you can check both boxes: the router will attempt both types of authentication, and one attempt will succeed. CHAP authentication is more secure than PAP authentication.
Username	The username is given to you by your Internet service provider or network administrator and is used as the username for CHAP or PAP authentication.
Password	Enter the password exactly as given to you by your service provider. Passwords are case sensitive. For example, the password cisco is not the same as Cisco.
Confirm Password	Reenter the same password that you entered in the previous box.

Configure LMI and DLCI

If you are configuring a connection with Frame Relay encapsulation, you must specify the protocol used to monitor the connection, called the Local Management Identifier (LMI), and provide a unique identifier for this particular connection, called a data link connection identifier (DLCI).

Field Reference

Table 5-9 describes the fields in this screen.

Table 5-9 LMI and DLCI Fields

Element	Description
LMI Type
ANSI	Annex D defined by American National Standards Institute (ANSI) standard T1.617.
Cisco	LMI type defined jointly by Cisco Systems and three other companies.
ITU-T Q.933	ITU-T Q.933 Annex A.
Autosense	The default. This setting allows the router to detect which LMI type is being used by communicating with the switch and to then use that type. If autosense fails, the router will use the Cisco LMI type.
DLCI	Enter the DLCI in this field. This number must be unique among all DLCIs used on this interface.
Use IETF Frame Relay Encapsulation	Internet Engineering Task Force (IETF) encapsulation. This option is used with connecting to non-Cisco routers. Check this box if you are connecting to a non-Cisco router on this interface.

Configure Clock Settings

The Clock Settings window is available when you are configuring a T1 or E1 link. The default Frame Relay clock settings are shown in this page. You should not change them unless you know you have different requirements.

Field Reference

Table 5-10 describes the fields in this screen.

Table 5-10 Clock Settings Fields

Element	Description
Clock Source	Internal specifies that the clock be generated internally. Line specifies that the clock source be taken from the network. The clock synchronizes data transmission. The default is line.
T1 Framing	This field configures the T1 or E1 link for operation with D4 Super Frame (sf) or Extended Superframe (esf). The default is esf.
Line Code	This field configures the router for operation on binary 8-zeros substitution (B8ZS) or alternate mark inversion (AMI) T1 lines. The b8zs setting ensures density on a T1 or E1 line by substituting intentional bipolar violations in bit positions 4 and 7 for a sequence of eight zero bits. When the router is configured with the AMI setting, you must use the data-coding inverted setting to ensure density on the T1 line. The default is b8zs.
Data Coding	Click inverted if you know that user data is inverted on this link, or if the Line Code field is set to AMI. Otherwise leave this set to the default value normal. Data inversion is used with bit-oriented protocols such as HDLC, PPP, and Link Access Procedure, Balanced (LAPB) to ensure density on a T1 line with AMI encoding. These bit-oriented protocols perform "zero insertions" after every five "one" bits in the data stream. This has the effect of ensuring at least one zero in every eight bits. If the data stream is then inverted, it ensures that at least one out of every eight bits is a one. Cisco SDM will set data coding to inverted if the line code is AMI and there are no time slots configured for 56 kbps. If you do not want to use inverted data coding with the AMI line code, you must use the CLI to configure all time slots to 56 kbps.
Facilities Data Link (FDL)	This field configures the router behavior on the Facilities Data Link (FDL) of the Extended Superframe. When configured with att, the router implements AT&T TR 54016. When configured with ansi, it implements ANSI T1.403. When you choose both, the router implements both att and ansi choices.When you choose none, the router ignores the FDL. The default is none. If T1 or E1 framing is set to sf, Cisco SDM will set FDL to none and make this field read-only.
Line Build Out (LBO)	This field is used to configure the line build out (LBO) of the T1 link. The LBO decreases the transmit strength of the signal by -7.5 or -15 decibels. It is not likely to be needed on actual T1 or E1 lines. The default is none.
Remote Loopback Requests	This field specifies whether the router will go into loopback mode when a loopback code is received on the line. Choosing full causes the router to accept full loopbacks, while choosing payload-v54 will cause the router to choose payload loopbacks.
Enable Generation/Detection of Remote Alarms	Check this box if you want the router T1 link to generate remote alarms (yellow alarms) and to detect remote alarms being sent from the peer on the other end of the link. The remote alarm is transmitted by a router when it detects an alarm condition: either a red alarm (loss of signal) or a blue alarm (unframed 1s). The receiving channel service unit/data service unit (CSU/DSU) then knows that there is an error condition on the line. This setting should only be used when T1 framing is set to esf.

Configuring a DSL Connection

Complete these steps to configure an ADSL, or G.SHDSL connection:

---

Step 1 If you want to review the IOS CLI commands that you send to the router when you complete the configuration, go to the Cisco SDM toolbar, and click Edit > Preferences > Preview commands before delivering to router.

Step 2 In the Cisco SDM toolbar, click Configure.

Step 3 In the Cisco SDM taskbar, click Interfaces and Connections.

Step 4 The Create Connection tab displays the available DSL connection types, for example, ADSL (PPPoE or RFC 1483 routing or PPPoA). Choose an available connection type.

Step 5 Click Create Connection to start the wizard. The wizard Welcome screen describes the tasks you will complete.

Step 6 Click Next to go to the subsequent screens to configure the connection.

Step 7 Cisco SDM displays the Summary screen when you have completed the configuration. Review the configuration. If you need to make changes, click Back to return to the screen in which you need to make changes, then return to the Summary screen.

Step 8 If you want to test the connection after sending the configuration to the router, check Test the connectivity after configuring. After you click Finish, Cisco SDM tests the connection and displays the test results in another screen.

Step 9 To send the configuration to the router, click Finish.

---

The DSL Connection Reference describes the screens that Cisco SDM displays.

DSL Connection Reference

•WAN Wizard Interface Welcome Window

•Select Interface

•Encapsulation: PPPoE

•Encapsulation Autodetect

•IP Address: ATM or Ethernet with PPPoE/PPPoA

•IP Address: ATM with RFC 1483 Routing

•Authentication

•Advanced Options

•PVC

•Summary

IP Address: ATM or Ethernet with PPPoE/PPPoA 

Choose the method that the WAN interface will use to obtain an IP address.

Field Reference

Table 5-11 describes the fields in this screen.

Table 5-11 ATM or Ethernet with PPPoE or PPPoA

Element	Description
Static IP Address	If you choose Static IP Address, enter the IP address and subnet mask or the network bits in the fields provided.
Dynamic (DHCP Client)	If you choose Dynamic, the router will lease an IP address from a remote DHCP server. Enter the name of the DHCP server that will assign addresses.
IP Unnumbered	Choose IP Unnumbered if you want the interface to share an IP address that has already been assigned to another interface. Then choose the interface whose IP address you want to use for the interface you are configuring.
Easy IP (IP Negotiated)	Choose Easy IP (IP Negotiated) if the router will obtain an IP address through PPP/IPCP address negotiation.
Dynamic DNS	Choose dynamic DNS if you want to update your DNS servers automatically whenever the WAN interface IP address changes. Click the Dynamic DNS button to configure dynamic DNS.

IP Address: ATM with RFC 1483 Routing

Choose the method that the WAN interface will use to obtain an IP address.

Field Reference

Table 5-12 describes the fields in this screen.

Table 5-12 ATM with RFC 1483 Routing

Element	Description
Static IP Address	If you choose Static IP Address, enter the IP address and subnet mask or the network bits in the fields provided. For more information, see IP Addresses and Subnet Masks.
Dynamic (DHCP Client)	If you choose Dynamic, the router will lease an IP address from a remote DHCP server. Enter the name of the DHCP server that will assign addresses.
IP Unnumbered	Click IP Unnumbered if you want the interface to share an IP address that has already been assigned to another interface. Then choose the interface whose IP address you want to use for the interface you are configuring.
Dynamic DNS	Choose dynamic DNS if you want to update your DNS servers automatically whenever the WAN interface IP address changes. Click the Dynamic DNS button to configure dynamic DNS.

Encapsulation Autodetect

In this window, choose the type of encapsulation that the WAN link will use. Ask your service provider or network administrator which type of encapsulation is used for this link. The interface type determines the types of encapsulation available.

Field Reference

Table 5-13 describes the fields in this screen.

Table 5-13 Encapsulation Fields

Element	Description
Autodetect	Click Autodetect to have Cisco SDM discover the encapsulation type. If Cisco SDM succeeds, it will automatically supply the encapsulation type and other configuration parameters it discovers. Note Cisco SDM supports autodetect on SB106, SB107, Cisco 836, and Cisco 837 routers. However if you are configuring a Cisco 837 router and the router is running Cisco IOS Release 12.3(8)T or 12.3(8.3)T, the autodetect feature is not supported.
Encapsulations Available for ADSL, G.SHDSL, or ADSL over ISDN
PPPoE	Provides Point-to-Point Protocol over Ethernet encapsulation. This option is available when you have selected an Ethernet interface or an ATM interface. An ATM subinterface and a dialer interface will be created when you configure PPPoE over an ATM interface. The PPPoE radio button will be disabled if your router is running a version of Cisco IOS that does not support PPPoE encapsulation.
PPPoA	Point-to-Point protocol over ATM. This option is available when you have selected an ATM interface. An ATM subinterface and a dialer interface will be created when you configure PPPoA over an ATM interface. The PPPoA radio button will be disabled if your router is running a version of Cisco IOS that does not support PPPoA encapsulation.
RFC 1483 routing with AAL5-SNAP	This option is available when you have selected an ATM interface. An ATM subinterface will be created when you configure an RFC 1483 connection. This subinterface will be visible in the Summary window.
RFC 1483 routing with AAL5-MUX	This option is available when you have selected an ATM interface. An ATM subinterface will be created when you configure an RFC 1483 connection. This subinterface will be visible in the Summary window.
Encapsulations Available for Serial Interfaces
Frame Relay	Provides Frame Relay encapsulation. This option is available when you have selected a serial interface. A serial subinterface will be created when you create a Frame Relay connection. This subinterface will be visible in the Summary window. Note If a Frame Relay serial connection has been added to an interface, only Frame Relay encapsulation will be enabled in this window when subsequent serial connections are configured on the same interface.
Point-to-Point Protocol	Provides PPP encapsulation. This option is available when you have selected a serial interface.
High Level Data Link Control	Provides HDLC encapsulation. This option is available when you have selected a serial interface.

PVC  

ATM routing uses a two-layer hierarchical scheme, virtual paths and virtual channels, denoted by the virtual path identifier (VPI) and virtual channel identifier (VCI), respectively. A particular virtual path may carry a number of different virtual channels corresponding to individual connections. When switching is performed based on the VPI, all cells on that particular virtual path are switched regardless of the VCI. An ATM switch may route according to VCI, VPI, or both VCI and VPI.

Field Reference

Table 5-14 describes the fields in this screen.

Table 5-14 PVC Fields

Element	Description
VPI	Enter the VPI value obtained from your service provider or system administrator. The virtual path identifier (VPI) is used in ATM switching and routing to identify the path used for a number of connections. Enter the VPI value given to you by your service provider.
VCI	Enter the VCI value obtained from your service provider or system administrator. The virtual circuit identifier (VCI) is used in ATM switching and routing to identify a particular connection within a path that it may share with other connections. Enter the VCI value given to you by your service provider.

Cisco IOS Default Values

The values shown in the following table are Cisco IOS defaults. Cisco SDM will not overwrite these values if they have been changed during a prior configuration, but if your router has not been previously configured, these are the values that will be used

Connection Type	Parameter	Value
ADSL	•Operating mode	•Auto
G.SHDSL	•Operating mode •Line rate •Equipment type	•Annex A (United States) •Auto •CPE
ADSL over ISDN	•Operating mode	•Auto

Configuring an ISDN Connection

Complete these steps to configure an ISDN connection:

---

Step 1 If you want to review the IOS CLI commands that you send to the router when you complete the configuration, go to the Cisco SDM toolbar, and click Edit > Preferences > Preview commands before delivering to router.

Step 2 In the Cisco SDM toolbar, click Configure.

Step 3 In the Cisco SDM taskbar, click Interfaces and Connections.

Step 4 In the Create Connection tab, click ISDN (PPP).

Step 5 Click Create Connection to start the wizard. The wizard Welcome screen describes the tasks you will complete.

Step 6 Click Next to go to the subsequent screens to configure the connection.

Step 7 Cisco SDM displays the Summary screen when you have completed the configuration. Review the configuration. If you need to make changes, click Back to return to the screen in which you need to make changes, then return to the Summary screen.

Step 8 If you want to test the connection after sending the configuration to the router, check Test the connectivity after configuring. After you click Finish, Cisco SDM tests the connection and displays the test results in another screen.

Step 9 To send the configuration to the router, click Finish.

---

The ISDN Connection Reference describes the screens that Cisco SDM displays.

ISDN Connection Reference

•ISDN Wizard Welcome Window

•Select Interface

•IP Address: ISDN BRI or Analog Modem

•Switch Type and SPIDs

•Authentication

•Advanced Options

•Dial String

•Summary

ISDN Wizard Welcome Window

PPP is the only type of encoding supported over an ISDN BRI by Cisco SDM.

IP Address: ISDN BRI or Analog Modem

Choose the method that the ISDN BRI or analog modem interface will use to obtain an IP address.

Field Reference

Table 5-15 describes the fields in this screen.

Table 5-15 IP Address for ISDN BRI or Analog Modem Fields

Element	Description
Static IP Address	If you choose Static IP Address, enter the IP address and subnet mask or the network bits in the fields provided. For more information, see IP Addresses and Subnet Masks.
IP Unnumbered	Choose IP Unnumbered if you want the interface to share an IP address that has already been assigned to another interface. Then, choose the interface that has the IP address that you want the interface that you are configuring to use.
Easy IP (IP Negotiated)	Choose IP Negotiated if the interface will obtain an IP address from your ISP through PPP/IPCP address negotiation whenever a connection is made.
Dynamic DNS	Choose Dynamic DNS if you want to update your DNS servers automatically whenever the WAN interface IP address changes. Click the Dynamic DNS button to configure dynamic DNS.

Switch Type and SPIDs

ISDN BRI connections require identification of the ISDN switch type, and in some cases, identification of the B channels using service profile ID (SPID) numbers. This information will be provided to you by your service provider.

Field Reference

Table 5-16 describes the fields in this screen.

Table 5-16 Switch Type and SPIDs Fields

Element	Description
ISDN Switch Type	Choose the ISDN switch type. Contact your ISDN service provider for the switch type for your connection. Cisco SDM supports these BRI switch types: –
	•For North America: –basic-5ess—Lucent (AT&T) basic rate 5ESS switch –basic-dms100—Northern Telecom DMS-100 basic rate switch –basic-ni—National ISDN switches
	•For Australia, Europe, and the UK: –basic-1tr6—German 1TR6 ISDN switch –basic-net3—NET3 ISDN BRI for Norway NET3, Australia NET3, and New Zealand NET3switch types; ETSI-compliant switch types for Euro-ISDN E-DSS1 signaling system –vn3—French ISDN BRI switches
	•For Japan: –ntt—Japanese NTT ISDN switches
	•For voice or PBX systems: –basic-qsig—PINX (PBX) switches with QSIG signaling per Q.931
I have SPIDS	Check this check box if your service provider requires SPIDs. Some service providers use SPIDs to define the services that are subscribed to by an ISDN device that is accessing the ISDN service provider. The service provider assigns the ISDN device one or more SPIDs when you first subscribe to the service. If you are using a service provider that requires SPIDs, your ISDN device cannot place or receive calls until it sends a valid, assigned SPID to the service provider when the device accesses the switch to initialize the connection. Currently, only the DMS-100 and NI switch types require SPIDs. The AT&T 5ESS switch type may support a SPID, but we recommend that you set up the ISDN service without SPIDs. In addition, SPIDs have significance only at the local access ISDN interface. Remote routers never receive the SPID. A SPID is usually a 7-digit telephone number with some optional numbers. However, service providers may use different numbering schemes. For the DMS-100 switch type, two SPIDs are assigned, one for each B channel.
Spid 1	Enter the SPID for the first BRI B channel provided to you by your ISP.
Spid 2	Enter the SPID for the second BRI B channel provided to you by your ISP.

Dial String

Enter the phone number of the remote end of the ISDN BRI or analog modem connection. This is the phone number that the ISDN BRI or analog modem interface will dial whenever a connection is made. The dial string is provided to you by your service provider.

Configuring an Aux Backup Connection

Complete these steps to configure an Aux Backup connection:

---

Step 1 If you want to review the IOS CLI commands that you send to the router when you complete the configuration, go to the Cisco SDM toolbar, and click Edit > Preferences > Preview commands before delivering to router.

Step 2 In the Cisco SDM toolbar, click Configure.

Step 3 In the Cisco SDM taskbar, click Interfaces and Connections.

Step 4 In the Create Connection tab, click Aux Backup.

Step 5 Click Create Connection to start the wizard. The wizard Welcome screen describes the tasks you will complete.

Step 6 Click Next to go to the subsequent screens to configure the connection.

Step 7 Cisco SDM displays the Summary screen when you have completed the configuration. Review the configuration. If you need to make changes, click Back to return to the screen in which you need to make changes, then return to the Summary screen.

Step 8 If you want to test the connection after sending the configuration to the router, check Test the connectivity after configuring. After you click Finish, Cisco SDM tests the connection and displays the test results in another screen.

Step 9 To send the configuration to the router, click Finish.

---

The Aux Backup Connection Reference describes the screens that Cisco SDM displays.

Aux Backup Connection Reference

•Aux Backup Welcome Window

•Backup Configuration

•Backup Configuration: Primary Interface and Next Hop IP Addresses

•Backup Configuration: Hostname or IP Address to Be Tracked

•Summary

Aux Backup Welcome Window

The option to configure the AUX port as a dial-up connection only appears for the Cisco 831 and 837 routers.

The Aux dial-backup radio button is disabled if any of the following conditions exist:

•More than one default route exists.

•One default route exists and it is configured with an interface other than the primary WAN interface.

The Aux dial-backup option is not shown if any of the following conditions exist:

•The router is not using a Cisco IOS image that supports the Aux dial-backup feature.

•A primary WAN interface is not configured.

•The asynchronous interface is already configured.

•The asynchronous interface is not configurable by Cisco SDM because of the presence of unsupported Cisco IOS commands in the existing configuration.

Backup Configuration

ISDN BRI and analog modem interfaces can be configured to work as backup interfaces to other, primary interfaces. In that case, an ISDN or analog modem connection will be made only if the primary interface goes down for some reason. If the primary interface and connection go down, the ISDN or analog modem interface will immediately dial out and try to establish a connection so that network services are not lost.

Choose whether this ISDN BRI or analog modem connection should act as a backup connection.

Field Reference

Table 5-17 describes the fields in this screen.

Table 5-17 Backup Configuration Fields

Element	Description
Configure this connection as backup	Check this option to designate this interface as backup.
Do not configure this connection as backup.	Check this option if you do not want to designate this interface as backup.

Prerequisites

Note the following prerequisites:

•The primary interface must be configured for site-to-site VPN.

•The Cisco IOS image on your router must support the SAA ICMP Echo Enhancement feature.

Backup Configuration: Primary Interface and Next Hop IP Addresses

In order for the ISDN BRI or analog modem connection to act as a backup connection, it must be associated with another interface on the router that will act as the primary connection. The ISDN BRI or analog modem connection will be made only if the connection on the primary interface goes down.

Field Reference

Table 5-18 describes the fields in this screen.

Table 5-18 Hostname or IP Address to Be Tracked Fields

Element	Description
Primary Interface	Enter the IP address or hostname of the destination host to which connectivity will be tracked. Please specify an infrequently contacted destination as the site to be tracked.
Primary Next Hop IP Address	Choose the router interface that will maintain the primary connection.
Backup Next Hop IP Address	This field is optional. Enter the IP address to which the backup interface will connect when it is active, known as the next hop IP address.

Backup Configuration: Hostname or IP Address to Be Tracked

This screen lets you identify a specific host to which connectivity must be maintained. The router will track connectivity to that host, and if the router discovers that connectivity has been lost by the primary interface, a backup connection will be initiated over the ISDN BRI or analog modem interface.

Field Reference

Table 5-19 describes the fields in this screen.

Table 5-19 Hostname or IP Address to Be Tracked Fields

Element	Description
IP Address to Be Tracked	Enter the IP address or hostname of the destination host to which connectivity will be tracked. Please specify an infrequently contacted destination as the site to be tracked.

Configuring an Analog Modem Connection

Complete these steps to configure an Analog Modem connection:

---

Step 1 If you want to review the IOS CLI commands that you send to the router when you complete the configuration, go to the Cisco SDM toolbar, and click Edit > Preferences > Preview commands before delivering to router.

Step 2 In the Cisco SDM toolbar, click Configure.

Step 3 In the Cisco SDM taskbar, click Interfaces and Connections.

Step 4 In the Create Connection tab, click Analog Modem.

Step 5 Click Create Connection to start the wizard. The wizard Welcome screen describes the tasks you will complete.

Step 6 Click Next to go to the subsequent screens to configure the connection.

Step 7 Cisco SDM displays the Summary screen when you have completed the configuration. Review the configuration. If you need to make changes, click Back to return to the screen in which you need to make changes, then return to the Summary screen.

Step 8 If you want to test the connection after sending the configuration to the router, check Test the connectivity after configuring. After you click Finish, Cisco SDM tests the connection and displays the test results in another screen.

Step 9 To send the configuration to the router, click Finish.

---

The Analog Modem Connection Reference describes the screens that Cisco SDM displays.

Analog Modem Connection Reference

•Analog Modem Welcome

•IP Address: ISDN BRI or Analog Modem

•Authentication

•Dial String

•Summary

Analog Modem Welcome

This screen describes the tasks you will perform to configure an analog modem connection. PPP is the only type of encoding supported over an analog modem connection by Cisco SDM.

Configuring a Cable Modem Connection

Complete these steps to configure a Cable Modem connection:

---

Step 1 If you want to review the IOS CLI commands that you send to the router when you complete the configuration, go to the Cisco SDM toolbar, and click Edit > Preferences > Preview commands before delivering to router.

Step 2 In the Cisco SDM toolbar, click Configure.

Step 3 In the Cisco SDM taskbar, click Interfaces and Connections.

Step 4 In the Create Connection tab, click Cable Modem.

Step 5 Click Create Connection to start the wizard. The wizard Welcome screen describes the tasks you will complete.

Step 6 Click Next to go to the subsequent screens to configure the connection.