Cisco 3640 Series Bedienungsanleitung

Modem over ISDN BRI for the Cisco 3640 Router 1

Modem over ISDN BRI for the

Cisco 3640 Router

Feature Summary

The Modem over Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) feature for

the Cisco 3640 modular access router lowers the cost of remote access by offering high-speed

modem and ISDN connectivity for mobile customers, home-ofﬁces, and other remote-access users.

Branch ofﬁces and enterprises can support analog modem users who call over the public switched

telephone network (PSTN) into BRI interfaces in Cisco 3640 routers.

Analog modem calls arrive at a speed of 33.6 kilobits per second (kbps) via the PSTN. The router’s

digital modems accept the modem calls at connection speeds as fast as 56 kbps, adhering to the V.90

standard. As shown in Figure 1, the Cisco 3640 router in this way provides rapid access to email and

other network services.

Figure 1 Modem over ISDN BRI Feature

BRI

Cisco 3640 router with 4- or 8-port

module and internal digital modems

POTS

lines

Optional WAN to

headquarters

Ethernet

Home office

Small business

Mobile

PSTN

17271

Feature Summary

2Cisco IOS Release 12.0(3)T

Beneﬁts The following are beneﬁts of using Modem over ISDN BRI:

•Supports cost-effective and readily available BRI service

•Provides remote modem users with rapid Internet and LAN/WAN access

•Allows ﬂexible remote access application support

List of Terms

BRI—Basic Rate Interface. ISDN interface composed of two B channels and one D channel for

circuit-switched communication of voice, video, and data.

ISDN—Integrated Services Digital Network. Communication protocol, offered by telephone

companies, that permits telephone networks to carry data, voice, and other source trafﬁc.

NM—network module.

POTS—Plain Old Telephone Service. Basic telephone service supplying standard single-line

telephones, telephone lines, and access to the public switched telephone network.

PRI—Primary Rate Interface. ISDN interface to primary rate access. Primary rate access consists

of a single 64-Kbps D channel plus 23 (T1) or 30 (E1) B channels for voice or data.

PSTN—public switched telephone network. PSTN refers to the local telephone company.

SPID—service proﬁle identiﬁer. Number that some service providers use to deﬁne the services to

which an ISDN device subscribes. The ISDN device uses the SPID when accessing the switch that

initializes the connection to a service provider.

TEI—terminal endpoint identiﬁer. In ISDN, a number that identiﬁes a speciﬁc connection endpoint

within a service access point.

VIC—voice interface card.

WIC—wide-area network (WAN) interface card.

RestrictionsThis feature requires speciﬁc hardware and software:

•At least one of the digital modem network modules listed below—the number in the model name

indicates the number of digital modems that can be connected to the module.

—NM-6DM

—NM-12DM

—NM-18DM

—NM-24DM

—NM-30DM

These digital modem network modules do not have their own network connections, but instead

handle analog calls passing through other router interfaces. BRI modules can provide their ISDN

connectivity. Other modules, such as Ethernet, can provide connectivity to the LAN. The digital

modem module acts as a pool of available modems that can be used for both incoming and

outgoing calls. Digital modem network modules do not support BRI VIC or WIC interfaces.

Restrictions

Modem over ISDN BRI for the Cisco 3640 Router 3

•At least one of the following Cisco BRI network modules:

—NM-4B-S/T—Four-port ISDN BRI network module, minimum version 800-01236-03

—NM-4B-U—Four-port ISDN BRI with integrated NT-1 network module, minimum version

800-01238-06

—NM-8B-S/T—Eight-port ISDN BRI network module, minimum version 800-01237-03

—NM-8B-U—Eight-port ISDN BRI with integrated NT-1 network module, minimum version

800-01239-06

The version level is available from the show diag command, which displays the version number

as the part number. If your BRI network module is a version lower than those cited above or you

need more details, see the Cisco Connection Online (CCO) Field Notice titled Using Digital

Modems with the Cisco 3600 Basic Rate Interface (BRI) Network Module Upgrade in the Access

Products index. If your existing Cisco BRI network module is one of those listed above and does

not support the Modem over ISDN BRI feature, Cisco will upgrade the module at no charge.

•To support the Modem over ISDN BRI feature, V.90 modem portware—for instructions on

downloading this software or obtaining it otherwise, see the Cisco 3600 Series Modem Portware

Upgrade Conﬁguration Note on CCO.

PlatformsThis feature is supported on the Cisco 3640 router.

Note Due to Cisco 3620 slot limitations, the Modem over ISDN BRI feature is not supported on

the Cisco 3620 router.

Prerequisites

Before you can conﬁgure a Cisco 3640 router to provide Modem over ISDN BRI connectivity, you

must perform the tasks listed below:

•Obtain BRI service from your telecommunications provider. The BRI line must be provisioned

at the switch to support voice calls.

•Install a four-port or eight-port BRI network module into your Cisco router. Depending on the

type of network module and your BRI service, you might also need to install an external network

terminator (NT-1).

•Install a supported digital modem network module into the Cisco 3640 router.

•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

reconﬁgure buffers so the BRI interfaces function properly. To check the MTU of your interfaces,

use the show interfaces bri command. The show buffers command displays the free buffer

space. Use the buffers global conﬁguration command to make adjustments to initial buffer pool

settings and to the limits at which temporary buffers are created and destroyed.

Supported MIBS and RFCs

4Cisco IOS Release 12.0(3)T

For details about software conﬁguration, see the Cisco IOS Release 12.0 software document, Dial

Solutions Conﬁguration Guide. For more information about the physical characteristics of the BRI

network modules and their digital modem support, or instructions on how to install the network or

modemmodules,eitherseetheCisco3600seriesNetworkModuleHardware Installation Guide that

came with your BRI network module or view the up-to-date information on CCO.

Supported MIBS and RFCs

None.

Conﬁguration Tasks

The Modem over ISDN BRI feature is part of interface conﬁguration for BRI. You conﬁgure the BRI

interface after you have conﬁgured the ISDN global characteristics, which are switch type and TEI

negotiation timing. These characteristics can also be deﬁned for each BRI interface, as shown in the

steps below. For details on the global and interface conﬁguration commands, see the Cisco IOS

software document, Dial Solutions Conﬁguration Guide.

To set up the BRI interface characteristics, set the global parameters and then conﬁgure each

interface separately. Perform the following conﬁguration tasks:

Step Command Purpose

1Router(config)#isdn switch-type

switch-type

Conﬁgure the global ISDN switch type

to match the service provider switch

type. For a list of keywords, refer to

Table 1.

2Router(config)#isdn tei [first-call |

powerup]Conﬁgure when the ISDN Terminal

Endpoint Identiﬁer (TEI) negotiation

occurs. If this command is not used,

negotiation occurs when the router is

powered on.

The ﬁrst-call option is primarily used

in European ISDN switch types, such as

NET3 networks. The powerup option

should be used in most other locations.

3Router(config-if)#interface bri

slot/port

Enter interface conﬁguration mode to

conﬁgure parameters for the speciﬁed

interface.

slot is the location of the BRI module.

Valid values are from 0 to 3.

port is an interface number. Valid

values are from 0 to 7 if the module is

an eight-port BRI network module, or

from 0 to 4 if the module is a four-port

BRI network module.

4Router(config-if)#ip address

ip-address

mask

Specify an IP address and subnet for the

interface. You can also specify that

there is no IP address. For information

about IP addressing, see the IOS

software document, Network Protocols

Conﬁguration Guide, Part 1.

Restrictions

Modem over ISDN BRI for the Cisco 3640 Router 5

5Router(config-if)#encapsulation ppp Enable Point-to-Point Protocol (PPP)

encapsulation on the BRI interface. PPP

encapsulation is conﬁgured for most

ISDN communication.

If the router needs to communicate with

devices that require a different

encapsulation protocol, needs to detect

encapsulation on incoming calls

automatically, or needs to send trafﬁc

over a Frame Relay or X.25 network,

see the Cisco IOS software document,

Dial Solutions Conﬁguration Guide.

6Router(config-if)#dialer map

protocol

next-hop-address

name

hostname

speed 56|64

dial-string

isdn-subaddress

]

Router(config-if)#dialer map

protocol

next-hop-address

name

hostname

spc [speed

56 |64] [broadcast]

dial-string

isdn-subaddress

]

(Optional, Most locations) Deﬁne the

remote recipient’s protocol address,

host name, and dialing string;

optionally, provide the ISDN

subaddress; set the dialer speed to 56 or

64 kbps, as needed.

(Optional,Germany) Use the command

keyword that enables ISDN

semipermanent connections.

7Router(config-if)#dialer-group

group-number

(Optional) Assign the interface to a

dialer group to control access to the

interface.

8Router(config-if)#dialer-list

dialer-group

list

access-list-number

(Optional) Associate the dialer group

number with an access list number.

9Router(config-if)#access-list

access-list-number

{deny | permit}

protocol source address source-mask

destination destination-mask

(Optional) Deﬁne an access list

permitting or denying access to

speciﬁed protocols, sources, or

destinations. Permitted packets cause

the router to place a call to the

destination protocol address.

10 Router(config-if)#no ip-directed

broadcast (Optional) Disable the translation of

directed broadcast to physical

broadcasts.

11 Router(config-if)#isdn switch-type

switch-type

(Optional) Conﬁgure the interface

ISDN switch type to match the service

provider switch type. The interface

ISDN switch type overrides the global

ISDN switch type on the interface.

For a list of keywords, refer to Table 1.

12 Router(config-if)#isdn tei [first-call |

powerup](Optional) Determine when ISDN TEI

negotiation occurs for an individual

interface. This overrides the global

conﬁguration command.

Step Command Purpose

Configuration Tasks

6Cisco IOS Release 12.0(3)T

13 Router(config-if)#isdn spid1

spid-number

[

ldn

]Specify a SPID and local directory

number for the B1 channel. Currently,

only the DMS-100 and NI-1 switch

types require SPIDs. Although the

5ESS switch type might support a

SPID, we recommend that you set up

that ISDN service without SPIDs.

14 Router(config-if)#isdn spid2

spid-number

[

ldn

]Specify a SPID and local directory

number for the B2 channel.

15 Router(config-if)#isdn caller

number

(Optional) Conﬁgure caller ID

screening.

16 Router(config-if)#isdn answer1

[

called-party-number

]

subaddress

]

(Optional) Conﬁgure called-party

number veriﬁcation for a called-party

number or subaddress number in the

incoming setup message.

17 Router(config-if)#isdn calling-number

calling-number

(Optional) Specify the calling-party

number.

18 Router(config-if)#isdn not-end-to-end [56

|64](Optional) Conﬁgure the speed for

incoming calls not recognized as ISDN

end-to-end.

19 Router(config-if)#isdn incoming-voice

modem Route incoming voice calls to the

modem and treat them as analog data.

This step is required for the Modem

over ISDN BRI feature.

20 Router(config-if)#isdn modem-busy-cause

{

number

|busy |not available}(Optional) Specify the message that is

returned when no modem is available

for a call. This command is optional for

the Modem over ISDN BRI feature.

number is a 1- to 3-digit number. Valid

values are from 1 to 127, denoting a

Q.931 error cause code.

busy speciﬁes that the message will be

“USER BUSY” when modems are

unavailable.

not available speciﬁes that the message

will be “CHANNEL NOT

AVAILABLE” when modems are

unavailable.

21 Router(config-if)#isdn

fast-rollover-delay

seconds

(Optional) Conﬁgure a fast rollover

delay.

22 Router(config-if)#isdn sending-complete (Optional) Conﬁgure the BRI interface

to include the Sending Complete

information element in the outgoing

call Setup message. Used in some

geographic locations, such as Hong

Kong and Taiwan, where the sending

complete information element is

required in the outgoing call setup

message.

Step Command Purpose

Verify

Modem over ISDN BRI for the Cisco 3640 Router 7

Verify To verify the ISDN BRI interface conﬁguration, use the commands demonstrated below. The text

shown in bold displays the results of conﬁguration steps such as those shown in the “Conﬁguration

Tasks” section on page 4.

Step 1 The show running-conﬁg command in EXEC mode shows the current conﬁguration

running on the terminal. The example below shows some of the command output that is

relevant to B RI conﬁguration tasks.

Note The show startup-conﬁg shows the conﬁguration stored in NVRAM or in a

location speciﬁed by the CONFIG_FILE environment variable.

Building configuration...

Current configuration:

version 12.0

no service udp-small-servers

service tcp-small-servers

hostname Router

enable secret 5 $1$c8xi$tObplXsIS.jDeo43yZgq50

enable password xxx

username xxxx password x 11x5xx07

no ip domain-lookup

ip host Labhost 10.17.12.1

ip host Labhost2 10.17.12.2

ip name-server 10.70.169.21

interface Ethernet0

Table 1 ISDN Switch Types

Country ISDN Switch Type Description

Australia basic-ts013 Australian TS013 switches

Europe basic-net3 ETSI ISDN switches (UK and others)

basic-nwnet3 Norwegian NET3 ISDN switches (phase 1,

no longer exist, basic-net3 used instead)

basic-1tr6 National German ISDN switches

basic-vn2 National French ISDN switches

basic-vn3 National French ISDN switches

Japan ntt Japanese NTT ISDN switches

New Zealand basic-nznet3 New Zealand NET3 switches (no longer

exist, basic-net3 used instead)

North America basic-5ess Custom 5ESS switch

basic-dms100 NT DMS-100 switch

basic-ni National ISDN switches

Configuration Tasks

8Cisco IOS Release 12.0(3)T

ip address 10.17.12.100 255.255.255.192

no ip mroute-cache

no ip route-cache

no mop enabled

...

interface BRI1/7

description (408) 555-3777

ip address 10.1.1.26 255.255.255.1

no ip directed-broadcast

encapsulation ppp

no ip route-cache

no ip mroute-cache

no keepalive

shutdown

dialer idle-timeout 180

dialer map ip 10.1.1.9 name MDial1 14085550715

dialer map ip 10.1.1.14 name MDial2 14085553775

dialer-group 1

isdn switch-type basic-5ess

isdn incoming-voice modem

modem-busy-cause busy

no fair-queue

no cdp enable

ppp authentication chap

ppp multilink

...

interface Group-Async1

ip unnumbered Loopback0

no ip directed-broadcast

ip tcp header-compression passive

async mode interactive

peer default ip address pool default

no fair-queue

group-range 65 70

hold-queue 10 in

router igrp 109

network 10.21.0.0

ip local pool local 10.21.50.85 10.21.50.89

ip local pool default 10.1.1.1 10.1.1.253

ip classless

ip route 0.0.0.0 0.0.0.0 10.21.48.1

map-class dialer VOICE

dialer voice-call

map-class dialer DATA

dialer-list 1 protocol ip list 101

tacacs-server host 10.69.2.74

tacacs-server host 10.92.15.197

snmp-server community isdn RW

snmp-server enable traps isdn call-information

snmp-server host 10.69.3.154 traps isdn

Example 1: BRI Interfaces

Modem over ISDN BRI for the Cisco 3640 Router 9

Step 2 The show interfaces bri number command displays information about the physical

attributes of the ISDN BRI B and D channels. number is the slot location of the BRI

module. Valid values are from 0 to 3.

BRI0:1 is down, line protocol is down

Hardware is BRI

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255

Internet address is 10.1.1.3/27

Encapsulation PPP, loopback not set, keepalive not set

LCP Closed

Closed: IPCP

Last input never, output never, output hang never

Last clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 7 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

Conﬁguration Examples

The following examples show conﬁguration of just the Modem over ISDN BRI feature using the

interface conﬁguration commands for each interface, as well as a complete conﬁguration example

showing global conﬁguration, BRI interfaces, and modem conﬁguration.

Example 1: BRI Interfaces

The example below shows how to conﬁgure each BRI interface on a Cisco 3640 router for the

Modem over ISDN BRI feature.

interface BRI0/0

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000101 9194440001

isdn spid2 0444001101 9194440011

isdn incoming-voice modem

no shut

interface BRI0/1

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000201 9194440002

isdn spid2 0444001201 9194440012

isdn incoming-voice modem

no shut

Configuration Examples

10 Cisco IOS Release 12.0(3)T

interface BRI0/2

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000301 9194440003

isdn spid2 0444001301 9194440013

isdn incoming-voice modem

no shut

interface BRI0/3

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000401 9194440004

isdn spid2 0444001401 9194440014

isdn incoming-voice modem

no shut

interface BRI0/4

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000501 9194440005

isdn spid2 0444001501 9194440015

isdn incoming-voice modem

no shut

interface BRI0/5

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000601 9194440006

isdn spid2 0444001601 9194440016

isdn incoming-voice modem

no shut

interface BRI0/6

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000701 9194440007

isdn spid2 0444001701 9194440017

isdn incoming-voice modem

no shut

interface BRI0/7

no ip address

no ip directed-broadcast

encapsulation ppp

isdn switch-type basic-ni

isdn spid1 0444000801 9194440008

isdn spid2 0444001801 9194440018

isdn incoming-voice modem

no shut

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