8/22/2019 ICND22S07L02.PPs

1/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-1

Completing ISDN Calls

Configuring Dial-on-Demand Routing

8/22/2019 ICND22S07L02.PPs

2/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-2

Outline

Overview

DDR Overview

DDR Operation

Legacy DDR Configuration

Static Routes for DDR Defined

Interesting Traffic for DDR

DDR Dialer Information Configuration

ISDN PRI and Legacy DDR Configuration DDR Configuration Verification

DDR Configuration Troubleshooting

Summary

8/22/2019 ICND22S07L02.PPs

3/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-3

Connects when needed

Disconnects when finished

ISDN or PSTN

What Is Dial-on-Demand Routing?

8/22/2019 ICND22S07L02.PPs

4/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-4

When to Use DDR

Periodic connections

Small amounts of data

8/22/2019 ICND22S07L02.PPs

5/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-5

1. Route to destination is determined.

2. Interesting packets dictate DDR call.

3. Dialer information is looked up.

4. Traffic is transmitted.

5. Call is terminated.

Generic DDR Operation

8/22/2019 ICND22S07L02.PPs

6/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-6

3

1

2

Define static routesWhat route do I use?

Specify interesting trafficWhat trafficenables the link?

Configure the dialer informationWhatnumber do I call?

Configuring DDR

1

8/22/2019 ICND22S07L02.PPs

7/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-7

Defining Static Routes

8/22/2019 ICND22S07L02.PPs

8/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-8

dialer-list 1 protocol ip permit

dialer-list 1 protocol ip list 101

access-list 101 deny tcp any any eq ftpaccess-list 101 deny tcp any any eq telnetaccess-list 101 permit ip any any

Any IP traffic will initiate the link without access lists.

Any IP traffic, except FTP and Telnet, will initiate the linking.

Using access lists gives finer control.

Denies FTP

Denies Telnet

Specifying Interesting Traffic

8/22/2019 ICND22S07L02.PPs

9/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-9

Applies rules defined by

dialer-list to individual

interfaces

hostname Home!isdn switch-type basic-5ess!username central password ciscointerface BRI0ip address 10.1.0.1 255.255.255.0encapsulation pppdialer idle-timeout 180dialer map ip 10.1.0.2 name Central 5552000dialer-group 1no fair-queue

ppp authentication chap!

router ripnetwork 10.0.0.0!no ip classlessip route 10.10.0.0 255.255.0.0 10.1.0.2ip route 10.20.0.0 255.255.0.0 10.1.0.2!

dialer-list 1 protocol ip permit

Both Values

Must Match

Configuring the Dialer Information

8/22/2019 ICND22S07L02.PPs

10/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-10

Configuring the Dialer Information (Cont.)

8/22/2019 ICND22S07L02.PPs

11/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-11

Establishes the amount of traffic on the link

before a second link is enabled

Router(config-if)#dialer idle-timeout seconds

Optional Legacy DDR Commands

Router(config-if)#dialer load-thresholdload[outbound | inbound | either]

Establishes the idle time before disconnect

8/22/2019 ICND22S07L02.PPs

12/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-12

1

3

2

hostname Home!isdn switch-type basic-5ess!username central password cisco

interface BRI0ip address 10.1.0.1 255.255.255.0

encapsulation pppdialer idle-timeout 180dialer map ip 10.1.0.2 name Central 5552000dialer-group 1no fair-queue

ppp authentication chap!

router ripnetwork 10.0.0.0!no ip classlessip route 10.10.0.0 255.255.0.0 10.1.0.2ip route 10.20.0.0 255.255.0.0 10.1.0.2dialer-list 1 protocol ip permit

!

Legacy DDR Configuration TasksSummarized

8/22/2019 ICND22S07L02.PPs

13/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-13

Dialer Profiles Overview

8/22/2019 ICND22S07L02.PPs

14/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-14

Dialer Profile Elements

8/22/2019 ICND22S07L02.PPs

15/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-15

Dialer Profile Configuration Concepts andCommands

8/22/2019 ICND22S07L02.PPs

16/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-16

Configuring Dialer Interfaces

interface dialer1ip address 10.1.1.1255.255.255.0encapsulation pppdialer remote-name Smalluserdialer string 5554540

dialer idle-timer 180dialer pool 1dialer-group 1

ppp authentication chap!interface dialer2ip address 10.2.2.1255.255.255.0

encapsulation pppdialer remote-name Mediumuserdialer string 5551234dialer idle-timer 180dialer pool 1dialer-group 2 (cont.)

interface dialer3ip address 10.3.3.1 255.255.255.0encapsulation ppp

dialer remote-name Poweruserdialer string 4155554321dialer idle-timer 300dialer pool 1dialer-group 3

8/22/2019 ICND22S07L02.PPs

17/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-17

Configuring Physical Interfaces

8/22/2019 ICND22S07L02.PPs

18/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-18

Router#ping or telnet

Router#show dialer

Router#show isdn active

Router#show isdn status

Triggers a link

Displays current status of the link

Displays call status while call is in progress

Displays the status of an ISDN connection

Router#show ip route

Displays all routes, including static routes

Verifying DDR and ISDN Operation

8/22/2019 ICND22S07L02.PPs

19/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-19

NASX#show dialer interface bri0

Dial String Successes Failures Last called Last status5553872 6 0 19 secs Successful0 incoming call(s) have been screened.BRI0: B-Channel 1

Idle timer (120 secs), Fast idle timer (20 secs)Wait for carrier (30 secs), Re-enable (15 secs)

Time until disconnect 102 secs

Current call connected 00:00:19Connected to 5553872 (system1)

BRI0: B-Channel 2Idle timer (120 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is idle

BRI0 - dialer type =ISDN

Interface bound to profile Dialer0

Dialer state is data link layer upDial reason: ip (s=10.1.1.8, d=10.1.1.1)

Verifying Dialer Profiles Operation

8/22/2019 ICND22S07L02.PPs

20/27 2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-20

Router#debug dialer [events | packets]

Displays DDR debugging information about the packets

received on a dialer interface

Clears currently established connections from theinterface

Router#debug isdn q921

Shows ISDN Layer 2 messages

Router(config-if)#shutdown

Troubleshooting DDR and ISDN Operation

Shows ISDN call setup and teardown activity

Router#debug isdn q931

8/22/2019 ICND22S07L02.PPs

21/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-21

debug isdn q921 Example

Router#debug isdn q921

Jan 3 14:52:24.475: ISDN BR0: TX -> INFOc sapi = 0 tei = 64 ns = 5 nr = 2i = 0x08010705040288901801837006803631383835

Jan 3 14:52:24.503: ISDN BR0: RX INFOc sapi = 0 tei = 64 ns = 6 nr = 4

i = 0x0801070FJan 3 14:52:24.699: ISDN BR0: RX

8/22/2019 ICND22S07L02.PPs

22/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-22

debug isdn q931 Examples

Router#debug isdn q931

TX -> SETUP pd = 8 callref = 0x04Bearer Capability i = 0x8890Channel ID i = 0x83Called Party Number i = 0x80, `415555121202'RX

8/22/2019 ICND22S07L02.PPs

23/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-23

debug dialer Examples

Router#debug dialer events

Dialing cause: Serial0: ip (s=172.16.1.111 d=172.16.2.22)

Router#debug dialer packets

BRI0: ip (s=10.1.1.8, d=10.1.1.1), 100 bytes, interesting (ip PERMIT)

8/22/2019 ICND22S07L02.PPs

24/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-24

Resolving Outbound Call Problems

Cause

Missing or incorrect

interesting traffic

definitions

Incorrect interface state

Misconfigured dialer

map

Misconfigured dialer

profile

Suggested Action

Verify the configuration by using show

running-configuration

Make sure that the interface state is

up/up (spoofing)

Make sure that the dialing interface has

at least one dialer map statement

Make sure the dialer interface is

configured with a dialer pool X command

8/22/2019 ICND22S07L02.PPs

25/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-25

Summary

DDR allows two or more Cisco routers to establish adynamic connection over simple dial-up facilities.

DDR operates by first determining the route to thedestination, then if the traffic is interesting, initiating a call.

In the DDR configuration process, first the static routesmust be defined, then the interesting traffic must bespecified, and finally, the dialer information must beconfigured.

Static routes should be used across a DDR link so that thenumber is not dialed simply for routing updates.

8/22/2019 ICND22S07L02.PPs

26/27

2004 Cisco Systems, Inc. All rights reserved. ICND v2.27-26

Summary (Cont.)

DDR calls are triggered by interesting traffic, which can bedefined based on protocol, source address, destinationaddress, or a variety of other criteria.

Use the dialer group and dialer map commands on an

interface to associate a port and dialer string with a dial list. In the process of configuring ISDN PRI with legacy DDR,

dialer rotary groups and dialer profiles need to beconfigured.

show commands can be used to verify DDR configuration.

debug commands can be used to troubleshoot DDR calls.

8/22/2019 ICND22S07L02.PPs

27/27