12 Config Isdnbri 15

7/30/2019 12 Config Isdnbri 15

1/40

Configuring ISDN

BRIModule 15

Configuring ISDNCopyright 1998, Cisco Systems, Inc.


2/40


State a relevant use and context for ISDN networking

Identify ISDN protocols, function groups, referencepoints, and channels

Relate Point-to-Point Protocol (PPP) anddial-on-demand routing (DDR) functions to ISDN

Describe Ciscos implementation of ISDN BRI

Configure an ISDN call, open a circuit, and pass dataover an interface

Monitor and analyze ISDN operation through the router

Objectives

Upon completion of this module, you will be able toperform the following tasks:


3/40

ISDN BRI

Overview



4/40


Uses higher-quality end-to-end digital facilities

Sets up call faster than basic telephone service

Carries varied feeds (for example, packets,voice, video)

Meets demand for telecommuting bandwidth

Improves Internet response (especially forWorld Wide Web)

Using ISDN Services


5/40


Routing over ISDN

ISDN

IP

IPX

AppleTalk

All others

HDLC

PPP

Others

Choose one encapsulation option

X.25

FrameRelay

Connect to other WANs

All major routing protocols can use ISDN


6/40


Obtaining ISDN Services

S

CO COS

SS S

S

SS

S

S

SS S

Many providers and switch types

Services vary by regions and countries


7/40Configuring ISDNCopyright 1998, Cisco Systems, Inc.

Standards from the ITU (CCITT)

ISDN Protocols

ISDN Concepts,Aspects, andInterfaces

I-SeriesI.100 Series-Concepts, Structures,

TerminologyI.400-User-Network Interfaces (UNIs)

Switching andSignaling

Q.921-LAPD (Link Access Procedureon the D Channel)

Q.931-ISDN Network Layer BetweenTerminal and Switch

Q-Series

Protocols Key Examples

TelephoneNetwork andISDN

E.163-International TelephoneNumbering Plan

E.164-International ISDN Addressing

Issue

E-Series



LT ETNT1TE1

TATE2

ISDN Functions/ReferencePoints

S/T U V

R

Reference points characterize differentinterfaces

Functions are devices or hardware

functions



TE1

Native ISDN Interface

Router Connections to ISDN

Terminal Adapter

TATE2R

Non-ISDN InterfaceExamples:

EIA/TIA-232V.35X.21

Example of a nonnative ISDN interfaceint s 0

NT1U

ISDN

Local Loop to CO

Network Termination 1(ISDN Modem)

NT1 physically terminates the local loop

S/T

Example of a native interfaceint bri 0



Customer Premises to ISDN

BRI

PRI

Cisco 4x00 and7000 series routers

CSU

CPE in North America

CPE outside North America

Cisco2500, 3000, or 4000

series routers

NT1

ISDNServiceProvider

Switch



Cisco ISDN Features

Multiprotocol support Available on several router series

SNMP support with ISDN MIB group

Multiple bearer channels

Bandwidth on demand

Optional incoming call screening

PPP with compression options

Services only when needed by using DDR



1. Interesting packet arrives

Dial-on-Demand Routing forISDN

Remote Call

DestinationNT1 or

DSU/CSU

ISDN

Service

Provider

BRI or

PRI

NT1 or CSU/DSU

1.

2.

NT1 or CSU/DSU

3.

4.

TokenRing

2. Use host ID and dial string3. Make outgoing call to ISDN switch

4. Access circuit-switched destination


13/40

Configuring

ISDN BRI




ISDN Channels for BRI Are 2B+D

BRI is used globally for ISDN services

ISDNNT1

2B

Channel Mostly Used for:B Circuit-switched data (HDLC, PPP)

Capacity64 kbps

Channel Mostly Used for:

D

Capacity

16 kbps Signaling information (LAPD)

D

int bri 0



ISDN Configuration Tasks

Interface configuration

Select interface specifications

Configure ISDN addressing

Optional feature configuration

ISDN

Global configuration

Select switch type

Specify traffic to trigger DDR call



Router (config) #

isdn switch-type switch-type

Selecting the ISDN SwitchType

Specifies the type of ISDN switch withwhich the router communicates

Other line configuration requirementsvary for specific providers



Router (config) #

dialer-list dialer-group protocolprotocol-name [permit | deny ]

Router (config-if) #

dialer-group group-number


dialer mapprotocol next-hop-addressname[ name ] speedspeed dial-stringbroadcast

Specifying Traffic to TriggerCall



interface bri interface-number

Router (config) #

Selecting InterfaceSpecifications

Selects the interface for ISDN BRIoperation

encapsulation [ppp| hdlc]


Selects framing for ISDN BRI




isdn spid1 spid-number [ ldn ]

Setting SPIDs if Necessary

Sets a B channel Service ProfileIdentifier (SPID) required by manyservice providers


isdn spid2 spid-number [ ldn ]

Sets a SPID for the second B channel



Configuring for a Simple ISDNCall

Use PPP encapsulation

All IP traffic to destination triggers ISDN call

Carrier uses AT&T basic rate switch

Service provider assigns connectionparameters

EO

ISDN

Service

Provider

BRI0

NT1

Cisco A

172.16.126.1

T0

TokenRingNT1

172.16.126.2

Cisco B

EO

172.16.29.9



! set up switch type, static route and dialer for ISDN on Cisco Aisdn switch-type basic-5essip route 172.16.29.0 255.255.255.0 172.16.126.2dialer-list 1 protocol ip permit!! configure BRI interface for PPP; set address and maskinterface bri 0encapsulation ppp

ip address 172.16.126.1 255.255.255.0!! refer to protocols in dialer-list to identify interesting packetsdialer-group 1!! select call start, stop, and other ISDN provider detailsdialer wait-for-carrier-time 15dialer idle-timeout 300isdn spid1 0145678912

! call setup details for routerdialer map ip 172.16.126.2 name cisco-b 526-1234

BRI Simple ConfigurationExample


22/40


#show interface bri 0 1BRI0: B-Channel 1 is up, line protocol is upHardware is BRIMTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255Encapsulation PPP, loopback not set, keepalive not setlcp state = OPENncp ccp state = OPEN ncp ipcp state = OPENncp osicp state = NOT NEGOTIATED ncp ipxcp state = NOT NEGOTIATED

ncp xnscp state = NOT NEGOTIATED ncp vinescp state = NOT NEGOTIATEDncp deccp state = NOT NEGOTIATED ncp bridgecp state = NOT NEGOTIATEDncp atalkcp state = NOT NEGOTIATED ncp lex state = NOT NEGOTIATEDLast input 1w4d, output 1w4d, output hang neverLast clearing of "show interface" counters neverOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 0 bits/sec, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec

165 packets input, 9434 bytes, 0 no bufferReceived 0 broadcasts, 0 runts, 0 giants0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort165 packets output, 9418 bytes, 0 underruns0 output errors, 0 collisions, 10 interface resets, 0 restarts48 carrier transitions

Monitoring PPP on BRI


23/40


Apply extended access lists for call trigger

Enable caller ID screening

Select rate adaptation

Establish subaddresses

Specify multilink PPP

Optional InterfaceConfiguration

ISDN


24/40


On cisco-a, allow all IP traffic except Telnet andIGRP to trigger ISDN call to 172.16.59.0

Allow only IP traffic to all other destinations Carrier uses Northern Telecom DMS-100 switch

Service provider assigns ID, timers, and dial string

Extended Access List ISDNCalls

Cisco B

172.16.59.12

ISDN

Service

Provider

BRI0

NT1

172.16.49.1

NT1

172.16.49.2

Cisco A

NT1

Cisco C

172.16.39.0


25/40


isdn switch-type basic-dms100

ip route 172.16.59.0 255.255.255.0 172.16.129.2

! set up conditions for call to cisco-b: only IP but not for telnet or IGRP

access-list 101 deny tcp 172.16.49.0 0.0.0.255 172.16.59 0 0.0.255 eq 23

access-list 101 deny igrp 172.16.49.2 0.0.0.255 172.16.59 0 0.0.255

access-list 101 permit ip 172.16.49.2 0.0.0.255 0.0.0.0 255.255.255.255

dialer-list 2 list 101

!

! interface details follow

interface bri 0

ip address 172.16.49.1 255.255.255.0

! in group that refers to access statements in dialer-list for call trigger

dialer-group 2

dialer wait-for-carrier-time 15

dialer idle-timeout 300isdn spid1 0246864211

isdn spid2 0246864212

! call setup details for router and NT1

dialer map ip 172.16.129.2 name cisco-b 945

BRI Access List Example


26/40


Caller Identification Screening

Call setup messagewith local ISDNnumbers

1234

Router BRouter AISDN

RouterISDN

number

A 1234

Compare with

allowed numbers

Extra level of call management

Accept Call

Call not set up (and charged) until acceptance

Alternative: PPP encapsulation and CHAP


27/40


isdn caller numberRouter (config-if) #


isdn answer2 [ called-party-number ]

or

Sets the number to which interface responds


isdn answer1 [ called-party-number ]

Configuring Call Screening

Enables caller ID screening


28/40


Configured for outgoing calls

Selecting ISDN RateAdaptation

ISDN

BRI0BRI156 kbps

64 kbpsBRI0

56 kbps

Requested lower speed from call ishonored

64 kbps

Assigned on a per-destination basis


29/40


dialer mapprotocol next-hop-addressspeedspeed


Configuring Rate Adaptation

Negotiate speed for calls to thisdestination


30/40


ISDN SBus and Subaddresses

Multipoint Sbus

2B2B

ISDN phone

D D

SBus

ISDN Number

Connect NT1 to SBus with multipoint devices

4085551212

ISDN

Fax

NT1NT1

Subaddress

:2

:1:3

:2

Specify subaddress for each multipoint device,for example, 4085551212:2


31/40


dialer map protocol next-hop-address name

hostname dial-string[ :isdn-subaddress ]


Configuring Subaddresses

Specifies subaddress numbers usedin ISDN multipoint connections


32/40


Multilink PPP Operation

LCP Option Negotiation

MRRU

Bundle


33/40


ppp multilinkRouter (config-if) #

Configuring Multilink PPP

Enables multilink on rotary groupRouter (config-if) #

dialer load-thresholdloaddirection

[ outbound | inbound | either ]

Brings up links and adds them tobundle


34/40


isdn switch-type basic-net3interface bri 0ip address 172.16.11.1 255.255.255.0! accept only these calls in delivered by switchisdn caller 4153261415isdn caller 4153261417dialer map ip 172.16.11.2 speed 56 4153261415dialer map ip 172.16.11.3 4153261417:2dialer-group 1

Advanced ConfigurationExample

ISDN

BRI0

56 kbps

64 kbps

172.16.11.1

172.16.11.2

172.16.11.3

BRI0

BRI0001

002

(4153261415)

(4153261417)

(4085261416)TokenRing

NT1

NT1

NT1


35/40


isdn switch-type basic-net3interface bri 1ip address 172.16.11.3 255.255.255.0

! accept only these incoming callsisdn caller 4153261415isdn caller 4085261416dialer map ip 172.16.11.1 4085261416isdn answer1 4153261417:2dialer-group 1

Advanced ConfigurationExample (cont.)

172.16.11.3

ISDN

BRI0

56 kbps

64 kbps

172.16.11.1

172.16.11.2

BRI0

BRI0001

002

(4153261415)

(4153261417)

(4085261416)TokenRing

NT1

NT1

NT1


36/40


Router>show controller bri 0BRI unit 0D Chan Info:Layer 1 is ACTIVATEDidb 0x32089C, ds 0x3267D8, reset_mask 0x2buffer size 1524RX ring with 2 entries at 0x2101600 : Rxhead 0

00 pak=0x4122E8 ds=0x412444 status=D000 pak_size=001 pak=0x410C20 ds=0x410D7C status=F000 pak_size=0TX ring with 1 entries at 0x2101640:tx_count = 0,tx_head = 0,tx_tail = 000 pak=0x000000 ds=0x000000 status=7C00 pak_size=00 missed datagrams, 0 overruns, 0 bad frame addresses0 bad datagram encapsulations, 0 memory errors0 transmitter underruns

-- More --

Verifying ISDN


37/40


Router>show interface bri0 1

BRI0: 1 is up, line protocol is upHardware is BRIMTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255Encapsulation PPP, loopback not set, keepalive set (10 sec)DTR is pulsed for 1 seconds on resetLCP OpenOpen: IPCPLast input 4d10, output 4d10, output hang never

Last clearing of "show interface" counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 0 bits/sec, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec

26 packets input, 866 bytes, 0 no bufferReceived 0 broadcasts, 0 runts, 0 giants0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

34 packets output, 1017 bytes, 0 underruns0 output errors, 0 collisions, 12 interface resets, 0 restarts8 carrier transitions

Verifying ISDN (cont.)


38/40


Router# show dialerBRI0 - dialer type = ISDNDial String Successes Failures Last called Last status81012345678902 2 0 0:03:02 Successful0 incoming call(s) have been screened.BRI0: B-Channel 1Idle timer (30 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)Time until disconnect 9 secsCurrent call connected 0:03:03Connected to 81012345678902BRI0: B-Channel 2Idle timer (30 secs), Fast idle timer (20 secs)Wait for carrier (30 secs), Re-enable (15 secs)Current call connected 0:03:04

Connected to 81012345678902Packet MuxingGroup = 81012345678902 : No. members = 2 : Rec. seq = A : Send seq = AGroup = 81012345678902 : lost packets = 0 : Out of order = 3Group = 81012345678902 : Unassigned = 0 : First link = BRI0: B-Channel 1

Monitoring Multilink PPP


39/40


One signaling channel and multiple data channels

ISDN has two operational modes:

BRI on the Cisco 1000, 2500, 3000, and 4000 series

PRI on the Cisco 7000 and 4000 series

You may need an external TA; you will need an externalNT1 or DSU/CSU

Set parameter values for attaching as specified for theISDN-provider switch

Use standard DDR commands for making an ISDN call Caller ID screening provides security

Multilink PPP provides load balancing

Summary


40/40

Lab: L14

ISDN Basic RateInterface

Implementation

12 Config Isdnbri 15

Documents

Transcript of 12 Config Isdnbri 15