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Conguring ISDN
This chapter describes tasks that are required to get an Integrated Services Digital Network (ISDN) line and interface up, and describes features involved in conguring ISDN in a circuit-switched internetworking environment. For a complete description of the commands mentioned in this chapter, refer to the ISDN Commands chapter in the Wide-Area Networking Command Reference. This chapter does not address routing issues, dialer conguration, and dial backup. For information about those topics, see the Conguring DDR chapter. For information about the Channel Interface Processor (CIP), see the chapter entitled IBM Channel Attach Commands in the Bridging and IBM Networking Command Reference. The CIP is described in a separate chapter because of the interrelation of host system conguration values and router conguration values. For hardware technical descriptions, and for information about installing the router interfaces, refer to the hardware installation and maintenance publication for your particular product.

ISDN Task List

Perform the tasks in the following sections to congure ISDN lines and interfaces. You must congure the ISDN interfaceBasic Rate Interface (BRI), MBRI, or Primary Rate Interface (PRI)and network addressing. Perform the encapsulation for Frame Relay or X.25 task only if the trafc sent over the ISDN interface will cross a Frame Relay or X.25 network. The remaining tasks are optional.

Understand Line Conguration Requirements Congure an ISDN BRI Congure an ISDN PRI Enable Asynchronous Access over ISDN Congure Encapsulation for Frame Relay or X.25 Networks Congure Network Addressing Congure Automatic Detection of Encapsulation Type Congure Combinet Compatibility Congure Semipermanent Connections (optional, for Germany only) Perform Conguration Self-Tests Monitor and Maintain ISDN Interfaces

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You can also optionally congure snapshot routing for ISDN interfaces. Snapshot routing is a method of learning remote routes dynamically and keeping the routes available for a specied period of time, even though routing updates are not exchanged during that period. See the Conguring DDR chapter of this module for detailed information about snapshot routing. To place calls on the ISDN interface, you must congure it with dial-on-demand routing (DDR). For conguration information about ISDN using DDR, see the Conguring DDR chapter. For command information, refer to the chapter entitled DDR Commands in the Wide-Area Networking Command Reference. To congure bandwidth on demand and dial backup, see the Conguring DDR chapter. See the end of this chapter for the ISDN Conguration Examples section.

Understand Line Conguration Requirements

Before conguring the ISDN interfaces on your Cisco router, it is necessary to order a correctly congured ISDN line (BRI or PRI) from your telecommunications service provider. This process varies dramatically from provider to provider on a national and international basis. However, some general guidelines follow:

On a BRI, ask for two channels to be called by one number. On a PRI, ask for the channels to be called in descending order. Ask for delivery of calling line identication. Providers sometimes call this CLI or Automatic Number Identication (ANI). If the router is going to be the only device attached to the BRI, ask for point-to-point service and a data-only line. If the router is going to be attached to an ISDN bus (to which other ISDN devices might be attached), ask for point-to-multipoint service (subaddressing is required) and a voice-and-data line.

Congure an ISDN BRI

This section describes how to congure a BRI, whether it is the only BRI in a router or is one of many in an MBRI. Each of the BRIs in an MBRI can be congured separately and is congured in the same way as a BRI. Perform the tasks in the following sections to congure an ISDN BRI. The switch type selection and BRI specication tasks are required; the remaining are optional.

Check the Buffers Select the ISDN Switch Type Dene ISDN TEI Negotiation Specify ISDN Service Prole Identiers (SPIDs) (if required) Specify an ISDN Basic Rate Interface (BRI) Congure Called Party Number Verication Congure Calling Line Identication Screening Congure BRI for Leased Line Service

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Check the Buffers

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Configure an ISDN BRI

Congure ISDN Calling Number Identication (Australia only) Congure the Line Speed for Calls Not ISDN End-To-End

When conguring a BRI, after the system comes up, make sure enough buffers are in the free list of the buffer pool that matches the maximum transmission unit (MTU) of your BRI interface. If not, you must recongure buffers in order for the BRI interfaces to function properly. To check the MTU size and the buffers and, if necessary, to congure the buffers and the MTU size, complete the following tasks beginning in EXEC mode:
Task Check the MTU size. Check the free buffers. Congure the buffers. Command show interfaces bri number show buffers 1 congure terminal 2 buffers big permanent number buffers big max-free number buffers big min-free number buffers big initial number Specify the interface and enter interface conguration mode. Set the MTU size. interface bri number mtu 15003

1. This command is documented in the System Management Commands chapter in the Conguration Fundamentals Command Reference. 2. This command is documented in the System Image, Microcode Image, and Configuration File Load Commands chapter in the Conguration Fundamentals Command Reference. 3. This command is documented in the Interface Commands chapter in the Conguration Fundamentals Command Reference.

Select the ISDN Switch Type

ISDN supports a variety of service provider switches. Table 3 lists, by geographic areas, the ISDN switch types supported by the ISDN interface. If you congure an interface with the interface bri command, you must also select a switch. Perform the following task in global conguration mode:
Task Select the service provider switch type. Command isdn switch-type switch-type

Table 3

ISDN Service Provider Switch Types Switch Type No switch dened

Keywords by Area none

Australia

basic-ts013
Europe

Australian TS013 switches

basic-1tr6 basic-nwnet3

German 1TR6 ISDN switches Norway NET3 switches (phase 1)

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Configure an ISDN BRI Keywords by Area basic-net3 primary-net5 vn2 vn3
Japan

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Switch Type NET3 ISDN switches (UK, Denmark, and other nations); covers the Euro-ISDN E-DSS1 signalling system. European ISDN PRI switches (UK and Europe) French VN2 ISDN switches French VN3 ISDN switches

ntt primary-ntt
North America

Japanese NTT ISDN switches Japanese ISDN PRI switches

basic-5ess basic-dms100 basic-ni1 primary-4ess primary-5ess primary-dms100

New Zealand

AT&T basic rate switches NT DMS-100 basic rate switches National ISDN-1 switches AT&T 4ESS switch type for the U.S. (ISDN PRI only) AT&T 5ESS switch type for the U.S. (ISDN PRI only) NT DMS-100 switch type for the U.S. (ISDN PRI only)

basic-nznet3

New Zealand Net3 switches

Note Any router with an MBRI must be connected to the same switch type on all its ISDN

interfaces.

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Table 4 Switch Type
5ESS Custom BRI

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Configure an ISDN BRI

ISDN Switch Type Conguration Information Conguration

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 K outside local exchange.
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 prole identiers (SPIDs) required, assigned by service provider. MTERM = 2. Number of call appearances = 1. Display = No. Ringing/idle call appearances = idle. 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 and data. 2 directory numbers assigned by service provider. 2 SPIDs required; assigned by service provider. Set speed for ISDN calls to 56 K outside local exchange. Directory number 1 can hunt to directory number 2. 2 B channels for voice and data. 2 directory numbers assigned by service provider. 2 SPIDs required; assigned by service provider. Functional signaling. Dynamic terminal endpoint identier (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 K outside local exchange. Directory number 1 can hunt to directory number 2.

DMS-100 BRI

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Primary Rate Lines

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Conguration Line format = Extended Superframe Format (ESF). Line coding = binary 8-zero substitution (B8ZS). Call type = 23 incoming channels and 23 outgoing channels. Speed = 64 K. Call-by-call capability. 23 B+D. Trunk selection sequence = descending from 23 to 1. Set B+D glare to yield. Only 1 directory number assigned by service provider. Set speed of ISDN calls to 56 K outside local exchange. No SPIDs required.

Dene ISDN TEI Negotiation

This section applies to ISDN BRI only. You can determine when Layer 2 ISDN terminal endpoint identier (TEI) negotiation occurs. The default is for negotiation to occur when the router is powered on. TEI negotiation is useful in Europe and also useful for switches that might deactivate Layer 2 when no calls are active. To dene when TEI negotiation will occur, perform the following task in global conguration mode:
Task Determine when ISDN TEI negotiation occurs. Command isdn tei [rst-call | powerup]

Specify an ISDN Basic Rate Interface (BRI)

To specify an ISDN Basic Rate Interface (BRI) and enter interface conguration mode, perform the following task in global conguration mode:
Task Begin BRI conguration. Command interface bri number

Specify ISDN Service Prole Identiers (SPIDs)

This section applies to ISDN BRIs only. All ISDN devices subscribe to services provided by an ISDN service provider, usually a telephone company. However, only some service providers use service prole identiers (SPIDs) to dene the services subscribed to by the ISDN device that is accessing the ISDN service provider. The service provider assigns the ISDN device one or more SPIDs when you rst 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 accessing the switch to initialize the connection. Currently, only the DMS-100 and NI-1 switch types require SPIDs. The AT&T 5ESS switch type may support a SPID, but we recommend that you set up that ISDN service without SPIDs. In addition, SPIDs have signicance at the local access ISDN interface only. Remote routers are never sent the SPID. A SPID is usually a seven-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. Once your service provider has assigned you SPIDs, you must dene these SPIDs on the router so that when access to the switch is attempted, the router has the valid information available.
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Configure an ISDN BRI

To dene the SPIDs and the local directory number (LDN) on the router, perform the following tasks in interface conguration mode (after specifying interface bri):
Task Specify a SPID and local directory number for the B1-channel. Specify a SPID and local directory number for the B2-channel. Command isdn spid1 spid-number [ldn] isdn spid2 spid-number [ldn]

The LDN is optional but might be necessary if the router is to answer calls made to the second directory number. See the Conguring DDR chapter for information about conguring dial-on-demand routing (DDR). Refer to the DDR Commands chapter in the Wide-Area Networking Command Reference for specic DDR commands.

Congure Calling Line Identication Screening

This task applies only to Cisco 2500 series, Cisco 3000 series, and Cisco 4000 series routers that have a BRI. Calling line identication (also called caller ID) screening adds a level of security by allowing you to screen incoming calls. You can verify that the calling line ID is from an expected origin. CLI screening requires a local switch that is capable of delivering the CLI to the router. To congure caller ID screening, perform the following task in interface conguration mode:
Task Congure caller ID screening. Command isdn caller number

Note If caller ID screening is congured and the local switch does not deliver caller IDs, the router

rejects all calls.

Congure Called Party Number Verication

When multiple devices are attached to an ISDN BRI, you can ensure that only a single device answers an incoming call by verifying the number or subaddress in the incoming call against the devices congured number or subaddress or both. You can specify that the router verify a called-party number or subaddress number in the incoming setup message for ISDN BRI calls, if the number is delivered by the switch. You can do so by conguring the number that is allowed. To congure verication, perform the following task in interface conguration mode:
Task Specify that the router verify a called-party number or subaddress number in the incoming setup message. Command isdn answer1 [called-party-number][:subaddress]

Verifying the called-party number ensures that only the desired router responds to an incoming call. If you want to allow an additional number for the router, you can congure it, too.

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To congure a second number to be allowed, perform the following task in interface conguration mode:
Task Specify that the router verify a second called-party number or subaddress number in the incoming setup message. Command isdn answer2 [called-party-number][:subaddress]

Congure ISDN Calling Number Identication

This feature applies only to routers used in Australia. A router with a basic TS013 ISDN BRI interface might need to supply the network with a billing number for outgoing calls. The Australian network offers better pricing on calls in which the number is presented. To congure the interface to identify the billing number, perform the following task in interface conguration mode:
Task Specify the calling party number. Command isdn calling-number calling-number

Note The isdn calling-number command is supported only on Australian basic TS013 switch

types.

Congure the Line Speed for Calls Not ISDN End-To-End

When calls are made at 56 kbps but delivered by the ISDN network at 64 kbps, the incoming data can be corrupted. However, on ISDN calls, if the receiving side is informed that the call is not an ISDN call from end to end, it can set the line speed for the incoming call. To set the speed for incoming calls recognized as not ISDN end-to-end, complete the following task in interface conguration mode:
Task Set the speed to be used for incoming calls recognized as not ISDN end-to-end. Command isdn not-end-to-end {56 | 64}

Congure BRI for Leased Line Service

To congure a Basic Rate Interface (BRI) interface to use the ISDN physical connection as a leased-line service, use the isdn leased-line command. This service is offered in Japan and Germany and there is no call set up or tear down involved. Data is placed on the ISDN interface similar to the way data is placed on a leased line connected to a serial port. To congure the BRI to use the ISDN connection as a leased-line service, complete the following task in interface conguration mode:
Task Specify the BRI interface number. Command isdn leased-line bri number

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Configure an ISDN PRI

When you congure this feature on a router, make sure that an ISDN switch type is also congured. For example:
! isdn switch-type basic-net3 isdn leased-line BRI0 !

The type of switch is not important. Pick the switch type you normally use in your country.

Congure an ISDN PRI

ISDN Primary Rate Interface (PRI) is supported on the Cisco 4000, the Cisco 4500, and the Cisco 7000 series routers using T1 or E1 versions of the Multichannel Interface Processor (MIP) card in conjunction with PRI signaling software. Channelized T1 ISDN PRI offers 23 B channels and 1 D channel. Channelized E1 ISDN PRI offers 30 B channels and 1 D channel. Channelized T1 and channelized E1 are supported by corresponding controllers. A T1 or E1 controller has one physical network termination. However, it can have many virtual interfaces, depending on the conguration. Perform the tasks in the following sections as appropriate for the T1 controller or the E1 controller:

Congure Channelized T1 ISDN PRI Congure Channelized E1 ISDN PRI

Congure Channelized T1 ISDN PRI

To congure ISDN PRI on a channelized T1 controller, perform the following tasks beginning in global conguration mode:
Task Select a service provider switch type that accommodates PRI. (See Table 3, earlier in this chapter, for a list of supported switch types.) Specify a T1 controller on a Cisco 7000 or Specify a T1 controller on a Cisco 4000. Dene the framing characteristics as Extended Superframe Format (ESF). Dene the line code as binary 8 zero substitution (B8ZS). Congure ISDN PRI. Command isdn switch-type switch-type

controller t1 slot/port1 or controller t1 number1 framing esf 1 linecode b8zs pri-group [timeslots range]

1. This command is documented in the Interface Commands chapter in the Conguration Fundamentals Command Reference.

If you do not specify the time slots, the specied controller is congured for 23 B channels and 1 D channel.

Note Any router congured for ISDN support must be connected to the same switch type on all its

ISDN interfaces.
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Congure Channelized E1 ISDN PRI

To congure ISDN PRI on a channelized E1 controller, perform the following tasks, beginning in global conguration mode:
Task Select a service provider switch type that accommodates PRI. (See Table 3, earlier in this chapter, for a list of supported switch types.) Dene the controller location in the Cisco 7000 series by slot and port number. or Dene the controller location in the Cisco 4000 series by unit number, ranging from 0 through 2. Dene the framing characteristics as cyclic redundancy check 4 (CRC4). Dene the line code as high-density bipolar 3 (HDB3). Congure ISDN PRI. Command isdn switch-type switch-type

controller e1 slot/port1

controller e1 number1 framing crc41 linecode hdb3 pri-group [timeslots range]

1. This command is documented in the Interface Commands chapter in the Conguration Fundamentals Command Reference.

If you do not specify the time slots, the specied controller is congured for 30 B channels and one D channel.

Note Any router congured for ISDN support must be connected to the same switch type on all its

ISDN interfaces.

Enable Asynchronous Access over ISDN

You can congure a router to support asynchronous access over ISDN by globally enabling PPP on VTY lines. PPP is typically enabled on synchronous or asynchronous serial interfaces; however, the Cisco IOS software permits you to congure PPP on virtual terminal (VTY) lines. This congures the VTY line to support asynchronous access over ISDN from the ISDN terminal to the VTY session on the router. To enable asynchronous protocol features on VTY lines, perform the following task in global conguration mode:
Task Congure all VTY lines to support asynchronous protocol features Command vty-async1

1. This command is documented in the Terminal Lines and Modem Support chapter in the Access Services Command Reference.

This task enables PPP on VTY lines on a global basis on the router. To congure PPP on a per-VTY basis, use the translate command in the Protocol Translation Conguration Commands chapter of the Access Services Command Reference.

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Configure Encapsulation for Frame Relay or X.25 Networks

Congure Encapsulation for Frame Relay or X.25 Networks

Each of the ISDN B channels is treated as a serial line and supports HDLC and PPP encapsulation. The default serial encapsulation is HDLC. However, if trafc sent from this ISDN interface will cross a Frame Relay network or an X.25 network, the appropriate addressing and encapsulation tasks must be completed as required for Frame Relay or X.25 networks. See the Conguring Frame Relay chapter or Conguring X.25 and LAPB chapter for more information about addressing, encapsulation, and other tasks necessary to congure Frame Relay or X.25 networks.

Congure Network Addressing

The steps in this section support the primary goals of network addressing:

Dene which packets are interestingand will thus cause the router to make an outgoing call. Dene the remote host where the calls are going. Specify whether broadcast messages will be sent. Specify the dialing string to use in the call.

Intermediate steps that use shared argument values tie the host identication and dial string to the interesting packets to be transmitted to that host. You must congure the switch type before you congure network addressing. To congure network addressing, complete the following tasks beginning in interface conguration mode:
Task
Step 1

Command Dene the remote recipients protocol address, host name, and dialing string; optionally, provide the ISDN subaddress; set the dialer speed to 56 or 64 kbps, as needed. Assign the interface to a dialer group to control access to the interface. Associate the dialer group number with an access list number. Dene an access list permitting or denying access to specied protocols, sources, or destinations. dialer map protocol next-hop-address name hostname speed 56/64 dial-string[:isdn-subaddress]1

Step 2 Step 3 Step 4

dialer-group group-number1 dialer-list dialer-group list access-list-number1 access-list access-list-number {deny | permit} protocol source address source-mask destination destination-mask2

1. This command is documented in the DDR Commands chapter in the Wide-Area Networking Command Reference. 2. Many forms of this command are documented in various protocol-specific chapters in the Network Protocols Command Reference, Part 1 and the Network Protocols Command Reference, Part 2.

Packets that are permitted by the access list specied in Step 4 are considered interesting and will cause the router to place a call to the destination protocol address identied in both Steps 1 and 4.

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Note The access list reference in Step 4 of this task list is an example of the access list commands

allowed by different protocols. Some protocols might require a different command form or might require multiple commands. Refer to the relevant protocol chapter in the Network Protocols Conguration Guide, Part 1 or the Network Protocols Conguration Guide, Part 2 for more information about setting up access lists for a protocol.

For more information about dening outgoing call numbers, see the Conguring DDR chapter.

Congure Automatic Detection of Encapsulation Type

You can enable a serial or ISDN interface to accept calls and dynamically change the encapsulation in effect on the interface when the remote device does not signal the call type. For example, if an ISDN call does not identify the call type in the Lower Layer Compatibility elds and is using an encapsulation that is different from the one congured on the interface, the interface can change its encapsulation type on the y. This feature enables interoperation with ISDN terminal adapters that use V.120 encapsulation but do not signal V.120 in the call setup message. An ISDN interface that by default answers a call as synchronous serial with PPP encapsulation can change its encapsulation and answer such calls. Automatic detection is attempted for the rst 10 seconds after the link is established or the rst ve packets exchanged over the link, whichever is rst. To enable automatic detection of encapsulation type, perform the following task in interface conguration mode:
Task Enable automatic detection of encapsulation type on the specied interface. Command autodetect encapsulation encapsulation-type

You can specify one or more encapsulations to detect. Cisco IOS software currently supports automatic detection of PPP and V.120 encapsulations.

Congure Combinet Compatibility

Historically, Combinet devices supported only the Combinet Proprietary Protocol (CPP) for negotiating connections over ISDN B channels. To enable Cisco routers to communicate with those Combinet bridges, the Cisco IOS supports a new CPP encapsulation type. To enable routers to communicate over ISDN interfaces with Combinet bridges that support only CPP, perform the following tasks in interface conguration mode:
Task Specify CPP encapsulation. Enable CPP callback acceptance. Enable CPP authentication. Command encapsulation cpp cpp callback accept cpp authentication

Now most Combinet devices support PPP. Cisco routers can communicate over ISDN with these devices by using PPP encapsulation, which supports both routing and fast switching.

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Configure Semipermanent Connections

Combinet devices support only IP, IPX and bridging. For AppleTalk, Cisco routers automatically perform half-bridging with Combinet devices. For more information about half-bridging, see the Congure PPP Half-Bridging on Serial Interfaces section in the Conguring PPP for Wide-Area Networking chapter of this publication. Cisco routers can also half-bridge IP and IPX with Combinet devices that support only CPP. To congure this feature, you only need to set up the addressing with the ISDN interface as part of the remote subnet; no additional commands are required.

Congure Semipermanent Connections

German networks allow semipermanent connections between customer routers with BRIs and the 1TR6 basic rate switches in the exchange. Semipermanent connections are offered at better pricing than leased lines. Conguring BRIs for semipermanent connection requires only that you use a keyword that indicates semipermanent connections when you are setting up network addressing as described in the previous section of this chapter. To congure a BRI for semipermanent connections, use the following form of the dialer map command when you set up network addressing:
Task Dene the remote recipients protocol address, host name, and dialing string; indicate semipermanent connections; optionally, provide the ISDN subaddress; set the dialer speed to 56 or 64 kbps, as needed. Command dialer map protocol next-hop-address name hostname spc [speed 56 | 64] [broadcast] dial-string[:isdn-subaddress]1

1. This command is documented in the DDR Commands chapter in the Wide-Area Networking Command Reference.

Perform Conguration Self-Tests

To test the routers ISDN conguration, we suggest that you perform the following tasks:
Task Check Layer 1 (physical layer) of the BRI. Check Layer 1 (physical layer) of the PRI over T1. Check Layer 1 (physical layer) of the PRI over E1. Check Layer 2 (data link layer). Check Layer 3 (network layer). Command show controllers bri number1 show controllers t1 slot/port 1 show controllers e1 slot/port1 debug q921 debug isdn events debug q931 debug dialer show dialer 2
1. This command is documented in the Interface Commands chapter in the Conguration Fundamentals Command Reference. 2. This command is documented in the DDR Commands chapter in the Wide-Area Networking Command Reference.

See the Debug Command Reference for information about the debug commands.

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Monitor and Maintain ISDN Interfaces

Use the following commands to monitor and maintain ISDN interfaces:
Task Display information about the physical attributes of the ISDN BRI B and D channels. Display information about the physical attributes of the ISDN PRI over T1 B and D channels. (The number argument takes values between 1 and 23.) Display information about the physical attributes of the ISDN PRI over E1 B and D channels. (The number argument takes values between 1 and 31.) Display protocol information about the ISDN B and D channels. Display information about memory, Layer 2 or Layer 3 timers, or status of PRI channels. (The service keyword is available for PRI only.) Obtain general diagnostic information about the specied interface. Command show interfaces bri number show interfaces serial slot/port bchannel number1

show interfaces serial slot/port bchannel number

show controllers bri number show isdn {memory | timers | service}

show dialer [interface type number] 2

1. This command is documented in the Interface Commands chapter in the Conguration Fundamentals Command Reference. 2. This command is documented in the DDR Commands chapter in the Wide-Area Networking Command Reference.

ISDN Conguration Examples

This section provides the following ISDN conguration examples:

Multilink PPP Example Compression Examples Voice Over ISDN Examples Network Service Facility Example Dialer Rotary Groups Example

Multilink PPP Example

The following example enables Multilink PPP on BRI 0.
interface BRI0 description Enables PPP Multilink on BRI 0 ip address 7.1.1.1 255.255.255.0 encapsulation ppp dialer map ip 7.1.1.2 name starbuck 14195291357 dialer map ip 7.1.1.3 name roaster speed 56 14098759854 ppp authentication chap ppp multilink dialer-group 1

Compression Examples
The following example enables predictor compression on BRI 0.
interface BRI0

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ISDN Configuration Examples

description Enables predictor compression on BRI 0 ip address 7.1.1.1 255.255.255.0 encapsulation ppp dialer map ip 7.1.1.2 name starbuck 14195291357 compress predictor ppp authentication chap dialer-group 1

The following example enables Stacker compression on BRI 0.

interface BRI0 description Enables stac compression on BRI 0 ip address 7.1.1.1 255.255.255.0 encapsulation ppp dialer map ip 7.1.1.2 name starbuck 14195291357 compress stac ppp authentication chap dialer-group 1

Multilink PPP and Compression Example

The following example enables PPP Multilink and Stacker compression on BRI 0.
interface BRI0 description Enables PPP Multilink and stac compression on BRI 0 ip address 7.1.1.1 255.255.255.0 encapsulation ppp dialer map ip 7.1.1.2 name starbuck 14195291357 ppp authentication chap compress stac ppp multilink dialer-group 1

Voice Over ISDN Examples

The following example allows
incoming voice calls to be answered BRI 0. interface BRI0 description Allows incoming voice calls to be answered BRI 0 ip address 7.1.1.1 255.255.255.0 encapsulation ppp isdn incoming-voice data dialer map ip 7.1.1.2 name starstruck 14038182344 ppp authentication chap dialer-group 1

The following example places

an outgoing call as a voice call on BRI 1.

interface BRI1 description Places an outgoing call as a voice call on BRI 1 ip address 9.1.1.1 255.255.255.0 encapsulation ppp dialer map ip 9.1.1.2 name angus class calltype 19091238877 ppp authentication chap dialer-group 1 map-class dialer calltype dialer voice-call

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Network Service Facility Example

This is Network Service Facility (NSF), needed for an AT&T 4ESS switch when it is congured for Call-by-Call selection. The PRI 4ESS switch expects some AT&T specic information when placing outgoing ISDN PRI calls; the options are accunet, sdn and megacom.
isdn switchtype primary-4ess interface Serial1/1:23 description Will mark outgoing calls from AT&T type calls ip address 7.1.1.1 255.255.255.0 encapsulation ppp dialer map ip 7.1.1.2 name tommyjohn class sdnplan 14193460913 dialer map ip 7.1.1.3 name angus class megaplan 14182616900 dialer map ip 7.1.1.4 name angus class accuplan 14193453730 dialer-group 1 ppp authentication chap map-class dialer sdnplan dialer outgoing sdn map-class dialer megaplan dialer voice-call dialer outgoing mega map-class dialer accuplan dialer outgoing accu

Dialer Rotary Groups Example

The following example congures BRI interfaces to connect into a rotary group (dialer-group) and then congures a dialer interface for that dialer-group. This conguration permits IP packets to trigger calls.
interface BRI 0 description connected into a rotary group encapsulation ppp dialer rotary-group 1 interface BRI 1 no ip address encapsulation ppp dialer rotary-group 1 interface BRI 2 encapsulation ppp dialer rotary-group 1 interface BRI 3 no ip address encapsulation ppp dialer rotary-group 1 interface BRI 4 encapsulation ppp dialer rotary-group 1 interface Dialer 0 description Dialer group controlling the BRIs ip address 8.1.1.1 255.255.255.0 encapsulation ppp dialer map ip 8.1.1.2 name angus 14802616900

IV-208 Wide-Area Networking Configuration Guide

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dialer-group 1 ppp authentication chap dialer-list 1 protocol ip permit

CISCO CONFIDENTIAL
ISDN Configuration Examples

Configuring ISDN IV-209

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ISDN Configuration Examples

CISCO CONFIDENTIAL

IV-210 Wide-Area Networking Configuration Guide