Cisco 700 Series, 765 Series Configuration Manual

Cisco 700 Series Router
Configuration Guide

Software Release 4.4.

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About This Manual vii

Related Documentation viii
Conventions ix

Chapter 1 Overview 1-1

Supported Protocols 1-1
Software Images 1-2
Administrative Configuration Options 1-3

Chapter 2 Using Profiles w it h Cisco 700 Series Route rs 2-1

Profile Overview 2-1

Profiles and Connections 2-2

System and Profile Parameters 2-2

System Mode Parameter Set 2-3
Profile Mode Parameter Set 2-3
Permanent Profiles 2-4

CONTENTS

Creating and Modifying Profiles 2-5

Displaying Pr ofile Configurations 2-5
Removing Profile-Based Values 2-5
Deleting Profiles 2-6

Changing Profile Names 2-6
Incoming Calls 2-6
Outgoing Calls 2-7

Chapter 3 Basic Configurations 3-1

Basic Configura tion Concepts 3-1

Bridges and Routers 3-2

Profiles 3-2

LANs and WANs 3-2

Current Configuration 3-3

Remote and Central Sites 3-4

Contents iii

Password and Secret 3-4

Additional Refere nce 3-4
Starting Point 3-4

Setting SPID Autodetection (North America only) 3-5

Setting SPIDs Manually (North America only) 3-6
Bridging with a Ci sc o 700 S eries Router 3-7

Cisco 700 Series Router Bridgi ng Instructions 3-8
Routing IP with a Cisco 700 Series Router to an ISP 3-9

Routing a Cisco 700 Series Router to an ISP I ns tructions 3-11
Routing IP to a Central Sit e 3-11

Central Sit e IP Routing Command Summary 3-13
Routing IP and IPX On-Demand 3-14

On-Demand IP and IPX Routing with PPP Instructions 3-16

Central Site On-Demand IP and IPX Routing with PPP

Commands 3-17

Chapter 4 Using CHAP 4-1

SPID Detection (North America only) 4-2

iv

IP Static Routing and Callback with CHAP Authentication 4-2

Remote Cisco 76 5 Comma n d Summ ary 4-3
IP Static Routing with CHAP Authentication and MLP 4-4

Remote Cisco 76 5 Comma n d Summ ary 4-5
IP Static Routing with PAP Authentication and MLP 4-6

Remote Cisco 76 5 Comma n d Summ ary 4-7
IP Unnumbered Static Routing and CHAP with MLP 4-8

Remote Cisco 76 5 Comma n d Summ ary 4-9
IP Static and IPX Stati c Routing with CHAP and MLP 4-10

Remote Cisco 76 5 Comma n d Summ ary 4-11
IPX Static Routing with CHAP and MLP 4-12

Remote Cisco 76 5 Comma n d Summ ary 4-13
Multilink PPP Encaps ulation 4-14

Cisco 700 Series Router Configuration Guide

Dynamic Routing Protocols 4-14
Bridging to a Rout er Running Cisco IOS Software 4-15

Chapter 5 Configuring DHCP Relay, DHCP Server, and PAT 5-1

DHCP Description 5-2

DHCP Server Applica tion Notes 5-2

DHCP Relay Application Notes 5-3
PAT Description 5-3

PAT Application Notes 5-3
IPCP Description 5-4

IPCP Address Negotiation Applic ation Notes 5-4
PPP IPCP Negotiation Example 5-5

Cisco 765 Series Router Commands 5-5

Verify the Configuration 5-6
DHCP Relay with IPCP Negotiation Example 5-6

Cisco 765 Series Router Commands 5-6

Verify the Configuration 5-7
DHCP Server with IPCP Negotiation Example 5-7

Cisco 765 Series Router Commands 5-8

Verify the Configuration 5-8
PAT with IPCP Single-Desti nation Negotiat ion Example 5-9

Cisco 765 Series Router Commands 5-10

Verify the Configuration 5-10
DHCP Server and PAT with IPCP Singl e-Destinat ion Negotiation

Example 5-11

Cisco 765 Series Router Commands 5-12

Verify the Configuration 5-12
DHCP Server with PAT and IPCP Dual-Destination PPP Negotiation

Example 5-13

Cisco 765 Series Router Commands 5-14

Verify the Configuration 5-15

Contents v

Chapter 6 Configuring Remote CAPI 6-1

CAPI and RVS-COM 6-2

Supported D-Channel Protocols 6-3

Supported Applications 6-3

Remote CAPI Router Commands 6-3
Configuring the Cis co 700 Router as an RCAPI Server 6-4

RCAPI Command Summary 6-4

Verify the Configuration 6-5

Appendix A Token Card and Cisco Secure Authentication Support A-1

Token C achi n g A- 2

vi

Cisco 700 Series Router Configuration Guide

About This Manual

This chapt er discusses the organization, related documentation, an d conventions of the
Cisco 700 Series Router Configuration Guide.

This document is organized as follows:

• Chapter 1, “Overview,” provi des a brie f overview of Cisco IOS-700 software and

supported protocols.

• Chapter 2, “Using Profiles with Cisco 700 Series Routers, ” describes a set of

user -defi ned parameter s grouped in a customi zed prof il e and associa ted with a speci f ic
remote de vice.

• Chapter 3, “Basic Configurations,” describes how to connect a Ci sco 700 series router

to an In ternet service provider (ISP) or to a central site, s uch as you r company network.

• Chapter 4, “Using CHAP,” describes how to connect a Cisco 700 series router to a

router running Cisco IOS software.

• Chapter 5, “Configuring DHCP Relay, DHCP Server, and PAT,” describes how to

config ure Dyn amic Host Conf i gura tion Pr otocol (DHCP) re lay, DHCP server , and Po rt
Address Translation (PAT) on the Cisco 700 series router.

• Chapter 6, “Configuri ng Remote CAPI ,” describes how to configure Remote Common

Application Programmers Interfac e (CAPI) and the ISDN Device Control Protocol
(ISDN-DCP) on the Cisco 7 00 series router.

• Appendix A, “Token Card and Cisco Secure Authentic ation Support,” de sc ribes the

Token Card and Cisco Secure Authentication Supp ort security features.

About This Manual vii

Related Documentation

Related Documentation

The following documentation is also provided with your Cisco 700 series router:

• Release Notes for Cisco 700 Seri es Router Software provides the latest infor ma tion on

the router software. Release notes for previous versions of the softwa re are on the
Cisco Documentation CD-ROM and the Cisco Web site.

• Cisco 760 Quick Reference Guide and Cisco 770 Quick Reference Guide provide

hardware installa tion instructions and forms to assist you in gathe r ing configuration
information. Each guide incl udes a Cisco 700 Fast Step CD-ROM.

• Cisco 700 Series Router Command Reference provides details of all router commands.

The document is available on the Cisco Documentation CD-ROM and the Cisco Web
site in HTML format.

• Cisco 700 Series Router Install ation Guide provides instructions for cabling the

Cisco 700 series router. The documen t is available on the Cisco Documentati on
CD-ROM and the Ci sc o Web site in HTML format. A paper copy of the doc um ent is
provide d with your router.

Additional Cisco documentation and literature are available in a CD-ROM package tha t
ships with your Cis co 700 series router. The Documentation CD-ROM, a member of the
Cisco Connec tion famil y , is upda ted monthly. Therefore, it may be more up to dat e than the
printed doc umentation. T o order additi onal copies of the Document ation CD-ROM, conta ct
your local sales representative or call customer service. You can also access Cisco
documentat ion on the World Wide Web at http://www.cisco.com,
http://www-china.cisco.com, or http://www-europe.cisco.com.

Cisco 700 series router configuration information can be found at
http://www.cisco. com /warp/public/779/s mbiz/service/configs/700_configs. htm and
http://www.cisco.com/warp/cpropub/67/sample.html

If you are reading Cis co product documenta tion on the World Wide Web, you can submit
comments electronically. Click Feedback in the tool bar , an d sel ect Docume ntation. After
you complete the form, click Submit to send it to Cisco. W e appreciate your comments.

viii

Cisco700 Series Route r Conf iguration Guide

Con ven ti ons

This publication uses the following conventions to convey instructions and information:

• The caret character (^) represents the Control ke y.

For exa mple, the k ey combina tions ^D an d Ctrl-D are e quiv alent: Bot h mean hol d down
the Control key while you pre ss the D key. Keys are indicated in capitals, but are not
case sensitive.

• A string is defined as a nonquoted se t of cha r acters.

There are a f ew st rings tha t i nclude quotat ion marks a s pa rt of th e st atem ent. The ref ore,
common practice is not to include the quotation marks unless they are included in the
statement. For example, set the SNMP community string to public does not use

quotation marks around the string “public” bec ause when you enter the string, you
would not include the quotation marks.

Command descriptions use these conventions:

Conventions

• Verti cal bars ( | ) sepa r at e alter n at ive, mu tu a ll y excl u sive, ele m en t s.

• Square brackets ([ ]) indicate optional elements.

• Variables for which you supply values are in italic.

• Examples that contain system prompts denote interactive sessions, indicating the user

enters the command at the prompt. The system prompt indicates the current command
mode. For example, the prom pt router:2503> indicates profile mode. The exception is
when a list of commands is provided in an example c onfiguration; the prompt is not
show n for the sake of clarity.

• Fixed inf ormation you ent er is in boldface screen font . Variab le informatio n you

enter is in it a lic.

• Terminal sessions and infor mation the system displays are in screen font.

• Nonprinting characters, such as passwords, are in angle brackets (< >).

The command synt ax conta ins a combinat ion of bold and re gu lar uppe rcase a nd lo wercas e
alphanumer ic char acter s. You can ente r the full tex t of the commands, or you can enter the
abbre via ted fo rm. Th e abb rev iated form co nsis ts of t he f irs t chara cters in ea ch wo rd, s hown
in upperc ase bol d in the c ommand s ynt ax. The upperca se bold chara cters a re the m inimum
you must enter for the command to be recognized and exe cuted.

About This Manual ix

Conventions

The actua l commands you ent er ar e not c ase s ensi tiv e . The ca pit aliz ation and bold type are
used in this manual only to differenti ate the characters required for the abbreviated forms
of commands.

For example, The syntax of the se t system command is as fo llows:

SEt SYstemname [systemname]

The complete version of the set system command can be entered at the command prompt
as foll ow s:

12

93

6

>set systemname

systemname

>

systemname

The abbreviated version of the same command can be entered as follows :

>se sy

systemname

Note Means reader take note . Notes conta in helpful sugges tions o r references to mater ials

systemname

>

not contained in this manual.

Timesaver This symbol means the described action saves time. You can save

time by performing the action des cribed in the paragraph.

Caution This symb ol me ans reader be careful. In this situ ation, you might do

something that could result in equipment damage or loss of data.

x

Cisco700 Series Route r Conf iguration Guide

CHAPTER

1

Overview

Cisco 700 series ro uters connec t small off ice Ether net LANs t o corporat e networks t hrough
Integrated S ervices Digital Network (ISDN) Basic Rate Interface (BRI) lines. After
configuration, the router automatically routes pac kets to and from remote dest inations
using IP or Internetwork Pa ck et Exchange (IPX).

The Cisco 700 series router is a fixed config u ration rou t er. The rou t er op e r at in g syst em is
called Cisco IOS-700 software and is unique to the Cisco 700 series router.

Supported Protocols

The Cisco 700 series routers support the following protocols:

• IP

• IPX

• Internet Protocol Control Protocol (IPCP)

• Internet Control Message Protocol (ICMP)

• Internetwork Packet Exchange Control Protocol (IP XCP )

• Point-to-Point Protocol (PPP)

• Bridge Control Protocol (BCP)

• Multilink PPP (MLPPP)

• Address Resolution Protocol (ARP)

• Service Advertisement Protocol (SAP)

• Password Authentication Protocol (PAP)

Ove rview 1-1

Software Images

• Trivial File Transfer Protocol (TFTP server)

• Simple Network Manage ment Protocol (SNMP)

• Routing Information Protoco l (RIP) for IP and IPX

• Triggered RIP for IP

• Chall enge Handshak e A u thenticatio n Protocol (CHAP)

• Dynamic Host Configuration Protocol (DHCP)

• Port Address Translation (PAT)

• Remote Common Appli cation Programmers Interface (RCAPI)

• ISDN Device Control Protocol (ISDN-DCP)

Software Images

The Cisco 700 Series routers run a proprietary Cisco software (Cisco IOS-700 software)
image, whic h is differ ent than traditional Cisco IOS software. The image you use varies,
dependin g on the re gion in which the router is used and what feature set you desire. The
image name, fo r e xample, c760-i n.r- TPH. 43-1.bin , d esignat es th e re gion and featu res. The
regions are as follows :

• US for use in North America

• NET3 for use in Europe

• TR6 for use in Germany

• INS for use in Japan

• TPH for use in Australia

The fe atures are indicated as follows:

• Internet Read y ( IP onl y, 30 users with data compres si on on) im age s have a "b"

designation.

• Internet Re ady X.25 (IP only, 30 LAN de vices, compression, X.25) images have a "bxd"

designati on.

1-2

Cisco700 Series Router Command Reference

Administrative Configuration Opti ons

• Remote Office (IP/IPX, 1500 LAN devices, compression) images have an "r"

designation.

• Remote Office X.25 (IP/IPX, 1500 LAN devices, compr ession, X.25) images have an

"rxd" designation.

So the exampl e image named "c760-in.b-TPH.43-1.bin" is a Series 760 router image
software Release 4.3(1) wi th the Internet Ready feature set for Australia. (All Cisco 700
series routers run Series 760 router images. There are no Series 770 router images.)

You can verify the image loaded on your router by entering the
command-line prompt. The following example shows a router running a Cisco 760 (c760)
image for the Un ited States (US), release 4.0(1 ), and using t he Remote Off ice (r) f eature set:

guest> version
Software Version c760-in.r.US 4.0(1) - Jan 14 1997 19:00:23
Cisco 766
ISDN Stack Revision US 2.10 (5ESS/DMS/NI-1)

Administrative Configuration Opt ions

You can configure routers through the configuration port or across an IP network using
Telnet. In addition, Cisco IOS-700 software supports Cisco 700 Fast Step software
applications. These tools are on the Cisco 700 Fast Step CD-ROM in the Cisco 700 Quick
Reference Guide.

version command at the

Ove rview 1-3

Administra ti ve Configuration Options

1-4

Cisco700 Series Router Command Reference

CHAPTER

2

Using Profiles with Cisco 700
Series Routers

A profile is a set of configuration parameters associated with ports on the router or WAN
devices.

This chapter contains the following sections:

• Profile Overview

• System and Profile Parameters

• Creating and Modifying Profiles

• Incoming Calls

• Outgoing Calls

Profile Overview

There are two modes in which you can set parameters, the system mode and the profil e
mode. Syst em m ode parameters af fect the configuration on a global level. Profiles are se ts
of local parameters. Pr ofile mode parameters affect how the router handles the connection
to a device.

You do not have to rec onfigure the router every time you connect to a differe nt device.
Instead of using one set of configuration parameters for all devices, you can use different
profiles to c ommunicate with a varie ty of devic es.

For e xample , you c an cre ate a us er -def in ed prof i le call ed 250 0 t hat c ontain s the p aramete rs
to be used when communicating with a Cisco 2500 series router over the WAN. You can
customiz e your Cisco 700 series router to maintain up to 17 user-defined profil es . Profiles
are saved in the Cisco 700 series router nonvolatile RAM (NVRAM).

Using Profi les with Cisco 700 Series Routers 2-1

System and Profile Parameters

In addition to user-defined profiles, there are three permanent profiles, Internal, LAN, and
Standard. The Interna l profile stores parameters used to communicate be tween the LAN
and WAN ports on the Cisco 700 series router. The LAN profile stores paramet ers that
configure the LAN port on the router. The Standard prof ile is the default profil e. If
authentication is not required and the de st ination device you are connecting to does not
have a user-defined profile, the router uses the Standard profile.

Profiles and Connections

Prof iles are eithe r active or inactive. An ac tive profile cr eates a virtual connection to the
remote de vice associate d with the profile. A virtual connection is a connection without
physical channels. After creating a virtual connection, an on-demand call can be made to
the ass o ci at ed r em o t e d evic e to est ab lish a physical connection.

A physical connection is a dynamically crea ted pipeline of packets from the Cis co 700
series router to a switch on the WAN. All connections are associated with the profile that
defines the configuration of the connection.

Virtual and physical connections behave similarly; the difference is that physical
connections forward pack ets to the WAN. V irtual conn ections monitor packet tr affi c on the

LAN until a demand filter “see s” that a packet is destined for the WAN a n d in itiates a call
to the swit ch, opening the physical connection. Once the call is establis hed, the virtual
connection becomes an active physical connection, and the packets move through the
pipeline.

System and Profile P arameters

The system is composed of both system mode parameters, user-defined profiles, and
permanent profiles. System mode parameters can be changed only in system mode. The
prompt indi ca tes you are in system mode by displaying nothing or the router name . An
example of the prompt is shown below:

Router_name>

If you are in profile mode, the prof ile name appears on the prompt, separat ed from the
system name by a colon (:). An example of the prom pt is shown below:

Router_name:Profile>

2-2

Cisco700 Series Router Configuration Guide

All profi les are bas ed on the prof ile templa te and inhe rit the syst em-lev el v alues. When you
create a new profile, its default values are taken from the profile template.

System Mode Parameter Set

System mode par ameters aff ect the router as a system. Table 2-1 l ists the system
parameters.

Table 2-1 System Parameter Set

System Mode Parameter Set

Calle r ID pa ra m e te rs Call waiting PPP
Date and time Country group Screen length
Directory number(s) Addre ss age time Screen echo
Delay time Local and remote access SNMP
Forwarding mode Phone 1 and 2 SPIDs
Mult id es ti na tion di a lin g PPP cl ie nt pa ss wo r d Switch type
Numbering plan PPP client secret System password
Patterns Voice priority Power Source 1 detect
Passthru Compression System name
PPP auth entic a tio n

1 PPP = Po in t -to-P oint Pr oto col
2 SNMP = Simple Network Management Protocol
3 SPID = service profile identifier

Profile Mode Parameter Set

Changes made to profile mode parameters in system mode affect the profile template.
When a profil e is created, it in herits the matching system mode param eters from the profi le
template. Any changes to parameters in pr ofile mode apply only to that profile. Changes
made to prof ile par ameters i n system mode are stored i n the prof ile t emplate. Whe n you use
the set user command to create a user-defined profile, the default parameters for the new
profile are taken from system mode.

1

param e te rs

2

parame ters

3

Using Profi les with Cisco 700 Series Routers 2-3

System and Profile Parameters

Table 2-2 lists the parameters that can be configured in a profile.

Table 2-2 P rofile Parameters

Bridging Line speed PPP authentication (outgoing)
Ringback number Auto calling All IP parameters, including filters
Passthrough Demand PAP password (client and host)
Learning Timeout All IPX parameters, including filters
Subnet m ask Called number CHAP secr et (client and host)
Protocol Encapsulation Bridge filters (addr ess, type, and user -defined)
Loopback

Permanent Profile s

Cisco 700 series routers contain three permanent profiles. Permanent profiles can be
modif ied, but the y cannot be deleted. The permanent profiles are as follows:

LAN Determines how dat a is passed from the router to the LAN. This profile

is commonly used for connections made directly to the loca l network.

Internal Determines how data is passed between the bridge e ngine a nd the IP/ IPX

router .

Standard The default profile. If authentication is set to non e an d a profile does not

exis t for the WAN switch, the router uses the St andard prof ile by default.
If authenti ca tion is required and no profile is found, the call is dropped.

The decision to use the LAN or Internal profile involves some knowledge of your network
design and whether you are bridging or routing to remot e sites (or a combination of both).
It is be st t o use t he LAN prof ile inst ead of th e I nterna l p rof ile to simplif y t he conf igura tion.
You can easily associate the LAN profile with the Ethernet interface and the user-defined
profiles with the ISDN interface.

Sometimes situations arise (very infrequent) where you must route a protocol to one site
and bridge the same protocol to another sit e. Simply leave the LAN profile as a bridging
prof ile, and use the Internal profile for all routed protocol inf ormation.

2-4

Cisco700 Series Router Configuration Guide

Creating and Modifying Profiles

A new profile is created with the set user command. When you create a new profile, you
auto matically enter pr o file mode for that profile. The following example creates a user
profile called tomd. Ente r the set user command to create a profile using the profile
template for the default values of the parameters, a s follows:

Creating and Modifying Profiles

Host> set user
Host:tomd>

Notice that th e prof i le mode is indica ted b y the prom pt, whic h appear s as th e system name
and the profile name, separated by a colon. While this prompt is displayed, modifications
to the pa rameters only aff ect the p arameters in the prof ile. The changes do n ot af fect system
mode parameters or othe r profiles.

The cd command is used to change to system mode or to another profile. Following is an
exampl e of th e cd command used to chan g e to a permanent profile called LAN:

Router_name> cd LAN
Router_name:LAN>

Note that the prompt inc ludes the name o f the prof ile. You can no w modify th e LAN prof ile
parameters.

tomd

Displaying Profile Configurations

The show commands display the val ues associated with a pro file parameter in prof ile mode.
The commands work in system m o de to show the values ass o ciated with parameters in the
prof ile template.

In prof ile mode, some show commands only display profile paramete rs. Parameter values
that have been redefined in profile mode are indicat ed with a <*>. All other param ete r
values ar e in h erit ed fr o m the pr ofi l e template.

Removing Profile-Based Values

You can remove any parameter va lue within a profile with the unset command. The
parameter you removed inherits its value from the system mode.

Using Profi les with Cisco 700 Series Routers 2-5

Incoming Calls

In the following example, the profile parameter number is removed from the profile by
using the unset command:

Host:Profile> unset number

Deleting Profiles

The reset u ser co mman d de le t es a us er-d efi n ed pro fi le fro m th e rou t er. The thr e e
permanent prof iles (LAN, Internal, and Standard) cannot be deleted. This command also
closes any connection assoc iated with the prof ile.

In the following example, the tomd profile is removed from the system by using the
reset user command:

Host:Profile> reset user tomd

Changing Profile Names

The set profile user command changes the name of an existing prof ile. Enter this
command while in pr ofile m ode for t he prof ile you want to aff ect. In the follo wing example,
the profile name is being changed from 2500 to 4500:

766:2500> set profile user 4500
766:4500>

Incoming Calls

When th e router receives an inc oming c al l , th e r ou t er searches both act ive an d in ac tive
prof iles for a profile with the same name as the calling de vice. If it finds a prof ile with the
matching user ID, the router uses the configuration parameters of that profile while
communicating with the remote device. If the profi le is inactive, it is automatica lly
activated for the duration of the connec tion.

When the call is finished, the physical link between the two devices is disconnected.
However, the virtual conne ction to the remote router might be configured to remain active.

2-6

Cisco700 Series Router Configuration Guide

If the profile is configured to remain active after a link disconne cts, a virtual connection
remains. T he vir tua l conne ction monit ors t he LAN traffic. If pack ets des tine d for th e WAN
are detected, the router opens up the physical connection and forwards the packets.

If the profi le is configur ed to become inacti ve after a li nk disconnects, both the physical link
and the virtual connection to the re mot e router are disconne cted until anoth er call is
rece ived from th e same remote router.

Outgoing Calls

Outgoing calls require that the associated user-defin ed profiles be set to act ive, that the set
auto command be on , and t hat a p hone num ber to c all be stor ed i n the pr of il e. If t he pr of ile

is inactive, a number to dial is not available to the router.

Outgoing Calls

Using Profi les with Cisco 700 Series Routers 2-7

Outgoing Calls

2-8

Cisco700 Series Router Configuration Guide

CHAPTER

3

Basic Configurations

This chapt er contains basic conf iguration examples for connec ting a Cisco 700 seri es router
to an Internet se rvice provider ( I S P) or to a central site, s uch as your company netw ork. It
is assumed t hat your rout er i s ca bled a s desc ribed i n th e Cis co 700 Quick R efer e nce Gui de.
Before you procee d with the examples in this chapter, have the infor mation regarding
ordering the I SDN li ne an d the connection information in the Cisco 700 Quick Reference
Guide (shipped with your router package) available.

The chapter is writt en so that a kno wledge ab le begi nner can perform a basic conf igurat io n
of the router, guided by the examples. Explanations are kept to a minimum, but they do
show ho w the individual commands fit into the framework of a conf iguration.

This chapter has the following sections:

• Basic Configuration Concepts

• Starting Point

• Setting SPI Ds Man ually (North America only)

• Bridging with a Cisco 700 Series Router

• Routing IP wit h a Cis co 700 Series Router to an IS P

• Routing IP to a Central Site

• Routing IP and IPX On-Demand

Basic Configuration Concepts

The info r mation in t his section describes basic networking concepts as they relate to the
Cisco 700 series router and the examples present ed. If you have som e experience with
Cisco 700 series routers, you can skip this section.

Basic Configurations 3-1

Basic Configuration Concepts

Bridges and Route r s

Routers forward packets on to specific network segments based on a logical network
address, reducing network traff ic b y keeping unnecessary pa ckets off net work segment s by
only forwarding packets to se gments as required.

A bridge joins individual network segments into a singl e network. The bridge floods
packets on to all the network segments it is connected to. In other words, bridges offe r
simplicity and routers offer a greater degree of cont rol. Cisco 700 series routers can
function as a bridge and a router.

Profiles

Profiles are logically organized sets of commands for each connection that can be
customized and stored independently. This allows you to configure your router for more
than one conn ection. There are two types of profiles, permanent and user-defined. The
Cisco 700 Series Router Co mmand R eference publicat ion contai ns a n ext ensi v e d iscussi on
on profiles. It is importan t to understand the use of profiles before attempting to configure
your router.

LANs and WANs

Cisco 700 seri es r outers ha ve a “ LAN si de” and a “WAN side .” The LAN s ide of the ro uter
is the Ethernet 10Bas eT connection wher e your comput er (or another short -range networ k
device) is connected to the router. The WAN side is ISDN. The configuration commands
can affect function on one or both sides of the router. Which side is affected depends upon
the command and the profile containing the command.

3-2

Cisco 700 Seri es Router Configuration Guide

Current Configuration

You can display the current configura tion at any time using the show configuration
command. If you iss ued the com mand in s yst em mode , system m ode c ommands dis play. If
you issue the command in profile mode, profile mode commands display. An asterisk (*)
next t o a v al ue ind ica tes the v a lue ha s bee n modi f ied from t he def aul t va lu e. Th e com mand
is entered as follows:

>show config

Basic Configurations 3-3

Basic Configuration Concepts

The following sample display shows output for the Cisco 700 series routers, from the show
configuration command in system mode:

Host> show config
System Parameters

Environment

Screen Length 20
Echo Mode ON
CountryGroup 1

Bridging Parameters

LAN Forward Mode ANY
WAN Forward Mode ONLY
Address Age Time OFF

Call Startup Parameters

Multidestination OFF

Line Parameters

Switch Type 5ESS

Call Parameters Link 1 Link 2

Retry Delay 30 30

Profile Parameters

Bridging Parameters

Bridging ON
Routed Protocols
Learn Mode ON
Passthru OFF

Call Startup Parameters

Encapsulation PPP

Line Parameters

Line Speed AUTO
Numbering Plan NORMAL

Call Parameters Link 1 Link 2

Auto ON ON
Called Number
Ringback Number

Remote and Central Sites

In the exam ples, th e Cis co 7 00 se ries route r you are con f iguring is referred t o a s t he remote
router. This is strictly for ide ntification purposes and doe s not have anything to do with
geography or the physical location of the router.

3-4

Cisco 700 Seri es Router Configuration Guide

Password and Secret

Ther e ar e several typ es of auth en ti cat ion, s uch as P a ssw ord Aut hen tic at ion Pro toc ol ( PAP)
and Challenge Handshake Authentication Protocol (CHAP). To avoid confusion, the PAP
password is r eferre d t o as pas sword, and the CHAP s ecre t pass word is referre d to a s secret.
The PAP password is plain text. The CHAP secret is encrypted.

Additional Reference

For more information on the commands, basics of net working, profiles and so forth, refer
to the Cisco 700 Series Router Command Reference publication . The Cisco 700 Series
Command Reference publication also contains advanced configuration examples.

Starting Point

This section shows how to set the router to default values and provide basic configuration
information used in all configurations. All of the example configurations assume defa ult
values unless otherwise indicated.

Step 1 Use the set default c ommand as f ollo ws to be sure that you begi n with al l defa ult

values when configuring your router:

> set def

System-le ve l param eter s and the parame ters in the permanen t prof ile s are set to
their d efault values. Existing user-defined profil es are deleted and the router
reboots.

Step 2 Enter the set directorynumber command (usua lly a te n-digit local number wit h

no spaces or dashes) to set the ISDN directory numbers.

>set 1 directory number 4085551234
>set 2 directory number 4085551235

You are ready to set Servic e Profile Identifier (SP I D) automatic detection. A SPID is a
number pr ovided by the ISDN c arrier to identify the line configurati on of the BRI service.
Each SPID points to line setup and conf iguration information.

Basic Configurations 3-5

Starting Point

Setting a SPI D is des cribed in the section “Setting SPID Autodetection (North America
only)” in this chapter (recommended i f you are connec ting to a service provider where the
ISDN switch type is DMS-100 or National ISDN-1 (NI1)) or to enter the SPIDs manually,
as descr ibed in t he se ction “ Set tin g SPIDs Ma nually (North Americ a only)” in t his ch apter.

Setting SPID Autodetection (North America only)

If the servi ce pro vider ISDN swi tc h type is DMS-100 or Na tional ISDN-1 (NI1), the route r
supports an au tom atic SPID detection feature. This section describes ho w to s et the
autodet ection feature . If the switch type is 5ESS Custom PPP, do not enter SPIDs; go to the
next section.

Enable automatic SPI D detection featu r e as follows:

>set autodetection on

Once you enable the autodetection feature, wait for the router to complete the process. This
process might take several minutes to complete. When autodete ction is successful, the
following messages display:

>L76 1 Auto Spid Detect Successful 5ESS
>L76 1 055512340 Auto Spid Detect Successful
>L76 2 055512350 Auto Spid Detect Successful

No additional procedures are required. You can now enter specific configuration
information.

If autodetection fails , the followi ng me ssage displays :

>L84 Manually enter spids and set autodetection off

In this event, set autodetection off by using the set autodetection command and continue
with the section “Setting SPIDs Manually (North America only)” to enter SPIDs manually.

3-6

Cisco 700 Seri es Router Configuration Guide

Setting SPIDs Manually (North America only)

SPIDs can be detected automatically usi ng the set autodetection command, or SPIDs can
be entered manua lly, as described in this section.

If the service provider switch type is 5ESS Custom PPP, you do not need to enter SPIDs;
go to the next section. If the se rvice pro vider switch type is DMS-100, National (NI1), or
5ESS Multipoint, continue with this section.

To enter the SPIDs assigned by your ISDN service provider, take the following steps:

Step 1 Enter the set switch command to conf igure the ISDN switch type that is being

used with your ISDN line:

> set switch dms

Step 2 Enter the set spid command to set the r outer’s SPID numbers:

> set 1 spid
> set 2 spid

0510198765430
0510187654320

You are re ady to configure the router for a specific routing e nvironment.

An AT&T 5ESS switch can support up to eight SPIDs per BRI line. Beca use multiple
SPIDs can be applied to a single B channel, multiple services can be supported
simultaneou sly. For e x ample, th e f irs t B ch annel can be conf ig ured for da ta , a nd the se cond
B channel ca n be c onf igure d fo r both v o ic e and data. In th is scena rio, the sec ond B c hannel
can support an ISDN telephone in addition to supporting data connections. For 5ESS
switches , the SPID is usually the 10-digit ISDN number beginning with “01” and ending
with “0.” For example: ISDN number, 4085551212; SPI D, 0140855512120. (There is no
standard format for SPIDs. As a result, SPID value s can vary, depending on the switch
vendor and the carri er.)

DMS-100 and NI1 s wi tches s upport only tw o SPIDs , with only one B cha nnel pe r SPID. If
both B channels will be used for data only, enter the two SPIDs (one for each B channel).
An issue comes up when trying to run data and voice over the same B channel. Assuming
the f irst S PID is a pplied to t he fi rst B c hannel for data traf fi c and is l imited t o that B channel
only, this leaves only one other SPID for the s econd B channel.

Consequently, the sec ond B channel can be used for either data or voice, but not both
simultaneous ly. The absence or presence of the second SPID in the configuration dictates
whether the second B channel can be used for data or voice. This is an example of SPID

Basic Configurations 3-7

Bridging with a Cisco 700 Ser ies Router

values for DMS-100 and NI1 switches: ISDN number, 4085551212; SPID 1,
408555121201; SPID 2, 408555121202. In this c ase the S PID is the 10-digit IS DN number

ending with a “01” for SPID 1 and a “02” for SPID 2.

Bridging with a Cisco 700 Series Router

This s ectio n d escribe s ho w to br idge a Cisc o 700 se ries ro uter o v er a n ISDN l ine t o a nother
router. Bridging is used in c as es where you do not need a lot of filtering to manage the
network. Basically , you are relying on the nodes on the LAN side of the router to de termine
if a packet shoul d be accepted or droppe d. (If you turn routin g on, you can fil ter the pack ets
on the WAN side, reducing your traffic on the LAN side.)

Note Bridging ov er an ISDN l ine i s not a n ef f icie nt us e of ISDN ba ndwid th. Ro uti ng ov e r

the ISDN line helps optimize ISDN bandwidth by reducing traffic to the WAN.

Figure 3-1 illustrates an example of a remote Cisco 700 series router bridging to a router
called central at a central site.

Figure 3-1 Bridging Example

IP address 172.16.125.9
Subnet mask 255.255.0.0

Enterprise

CPA765 Central

ISDN

network

IP address 172.16.125.10
Subnet mask 255.255.0.0

San Jose

H5860

You are going t o establish a basic connection with another router, relying primarily on the
defaul ts . In this example configuration, a simple user-defined profile is created in your
Cisco 700 series router to bridge over an ISDN network to a nother router.

By def ault, the Cisco 7 00 series router a utomati cally “lear ns” the MA C addr esses that ex ist
locally and remotely across th e WAN. The router stores the MAC addresses in a MAC
address table, so it kno ws if the unicast packe ts should remain on the LAN or forwar ded

3-8

Cisco 700 Seri es Router Configuration Guide

across the ISDN li ne. In a bridging scenar io, the router does not ne ed an IP addr es s and
bridging occ urs regardless. The IP address is used when the router is being mana ged
remote ly by a Telnet session or par ticipating in SNMP.

Both sides of the WAN must be configured with PPP host names, secrets, and passwords
for authentication. Each profile must a lso include dialing information.

Cisco 700 Series Router Bridging Instructio ns

The IP address and subnet mask are not entered. IP address assignments are not necessary
in a bridged network; they are used only if the router is being pinged or accessed through
Telne t or SNM P.

Follow ing is the co m m and su m mary for co nfigu r ing th e Cisc o 700 s er ies r o uter to br idge
to the ro ut er called ce nt ral at the central site:

set system
set user
set active
set ppp secret client
set ppp password client
set bridging on

1

number

set
set 2 number
reboot

CPA765

central

phone_number
phone_number

Routing IP with a Cisco 700 S eries Router to an ISP

This sect ion descri bes ho w to c onfigu re a Cisc o 700 serie s router to rout e to an I SP by us ing
Internet Protocol (IP). Figure 3-2 illus trates the configuration used in this example. By
default, PPP incoming authentication is on and outgoing authentication is off.

Note If you are connecting to an Ascend device, you must disable PPP Bandwidth

Allocation Control Protocol (BA CP) and PPP multilink.

Basic Configurations 3-9

Routing IP with a Cisco 700 Series Router to an ISP

The example also us es an unnumbered IP address on the Cisco 700 series router and a
dynamically-a ssigned IP address from the ISP, a common practice used to conserve IP
addresses.

Figure 3-2 Connecting to an ISP–Example Configuration

ISDN (WAN) interface
IP address: 0.0.0.0.
Subnetwork mask: 0.0.0.0.

Ethernet (LAN) interface
IP address: 172.16.17.9
Subnet mask: 255.255.255.248

Cisco 700

Cisco 700 series router
system name: 765
CHAP secret: cisco

ISDN network

IP unnumbered

Central

Central site router
System name: isp

H8757

In this exa m p le , a user-defin ed pr o file named is p is created, representi ng the ISP router.
Your router uses the isp pr ofile to initiate the call to the ISP router.

When the Cisco 700 series router calls the ISP router, it sends the ISP the PPP host name,
the CHAP secrets, and PAP passwords, depending upon what the other router requires to
authenticate the call.

3-10

Cisco 700 Seri es Router Configuration Guide

Routing a Cisco 700 Series Router to an ISP Instructions

Following is the command summa r y for configuring the remot e Cisco 700 series router to
connect to an ISP:

set system
cd lan
set ip address
set ip netmask
set ip routing on
set user
set number
set ppp password client
set ppp secret client
set ppp address negotiation local on
set ip routing on
set ip route destinatio
set bridging off
set ip address
set ip netmask
set timeout
set ip pat on
set active
reboot

764

172.16.17.9

255.255.255.248

isp

5558011

0.0.0.0

0.0.0.0

360

n 0.0.0.0/0

gateway

0.0.0.0

propagate on

If you are being charg ed for each connecti on, you can use the set timeout comman d to set
the ti meout to ze ro. Doin g s o maint ai ns your co nnecti on and minimiz es t he num ber of fees .

Routing IP to a Central Site

This section describe s how to configure a remote Cisco 765 router and a central site
Cisco 765 router for on-demand IP routing using PPP.

PPP addresses issues that include the assignme nt and manage me nt of IP addresses,
asynchronous (start/stop) and bit-oriented synchronous encapsulation, network protocol
multiplexing, error detection, and option negotiation.

PPP addresses these issues by providing an extensible Link Control Protocol (LCP) and a
family of Network Control Protocols (NCPs) to negotiate optional configuration
parameters and facilities . PPP supports IP and IPX.

Figure 3-3 is an illustration of the configuration used in this example.

Basic Configurat ions 3-11

Routing IP to a Central Site

Figure 3-3 Routing IP to a Central Site—Exam ple Configuration

ISDN interface
IP address: 10.48.125.7
IP subnet mask: 255.255.255.0

Ethernet interface
IP address: 172.16.17.9
IP subnet mask: 255.255.255.0

Cisco765

Remote router
System name: remote765
ISDN number: 5553693/4
User profile name: central765

In this example, the Cisco 765 router named remote765 is used to establis h a connection
through the ISDN service provider to the corporate network at a central site.

Ethernet interface
IP address: 172.15.1.100
IP subnet mask: 255.255.255.0

ISDN interface
IP address: 10.48.125.4
IP subnet mask: 255.255.255.0

ISDN

network

Central site router
System name: central765
ISDN number: 5550143/4
User profile name: remote765

Cisco765

S4802

3-12

Cisco 700 Seri es Router Configuration Guide

Central Sit e IP Routing Command Summary

Following is the command summary for conf iguring the remote Cisco 765 router for
on-demand IP routing using PPP:

set system
set multidestination on
cd LAN
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set user
set ppp password client
set ppp secret client
set ip address
set ip netmask
set ip routing on
set ip rip update demand
set ip route destination
set number
set timeout
set active
reboot

remote765

172.16.17.9

255.255.255.0

central765

10.48.125.7

255.255.255.0

0.0.0.0/0

5550143

360

gateway

10.48.125.4

Basic Configurat ions 3-13

Routing IP and IPX On-Demand

Follo wing is the command summary for c onfigu ring the centra l site Cisc o 700 series rout er
for on-demand IP routing with PPP:

set system
set multidest on
set ppp auth in chap
set ppp secret host
cd lan
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set user
set ppp auth out chap
set ppp secret client
set bridging off
set ip address
set ip netmask
set ip routing on
set ip rip update demand
set ip route destination
set ip rip version 1

1

number

set

2

number

set
set timeout
set active
reboot

central766

172.15.1.100

255.255.255.0

remote765

10.48.125.4

255.255.255.0

5553693
5553694

360

0.0.0.0

gateway

10.48.125.7

The set ip rip update demand com mand is only a pplicable to the Cisco 700 series route r.
If you are being charg ed for each connecti on, you can use the set timeout comman d to set

the ti meout to ze ro. Doin g s o maint ai ns your co nnecti on and minimiz es t he num ber of fees .

Routing IP and IPX On-Demand

This section describe s how to configure the remote Cisco 765 route r and the central sit e
Cisco 765 router for on-demand IP and IPX routing using PPP.

Figure 3-4 illustrates the configuration used in this e xam ple.

3-14

Cisco 700 Seri es Router Configuration Guide

Figure 3-4 Routing IP and IPX On-Demand —Example Configuration

ISDN interface
IP address: 10.32.125.7
IP subnet mask: 255.255.255.0
IPX network: 32125

Ethernet interface
IP address: 172.16.17.9
IP subnet mask: 255.255.255.0
IPX network: 1478
IPX Framing 802.2

765

Cisco765

Remote router
System name: remote765
ISDN number: 5553693/4
User profile name: central765

The remote Cisc o 765 router is used to establish a connect ion through the ISDN service
provider to the corporate network at a centra l site using PP P. The remote Cisco 765 router
has three permanent profiles: LAN, Internal , and Standard. This example uses the LAN
profile and a user-defined profile.

Ethernet interface
IP address: 172.15.1.100
IP subnet mask: 255.255.255.0
IPX network: 73146
IPX framing 802.2

ISDN interface
IP address: 10.32.125.4
IP subnet mask: 255.255.255.0
IPX network: 32125

ISDN network

Central site router
System name: central765
ISDN number: 5550143/4
User profile name: remote765

Cisco765

S4800

Basic Configurat ions 3-15

Routing IP and IPX On-Demand

On-Demand IP and IPX Routing with PPP Instructions

Following is the command summary for conf iguring the remote Cisco 765 router for
on-demand IP and IPX rout ing using PPP:

set system
set multidestination on
set ppp password client
set ppp secret client
set ppp auth out chap
set ppp password host
set ppp secret host
cd LAN
set ipx routing on
set ipx network
set ipx framing 802.2
set ipx rip update periodic
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set user
set ipx routing on
set ipx network
set ipx rip update demand
set ipx spoof
set ip route destination
set ip address
set ip netmask
set ip routing on
set ip rip update demand

1

number

set
set 2 number
set timeout
set active
reboot

remote765

1478

172.16.17.9

255.255.255.0

central765

32125

10

0.0.0.0/0

10.32.125.7

255.255.255.0

5550143
5551044

360

gateway

10.32.125.4

3-16

Cisco 700 Seri es Router Configuration Guide

Central Sit e On-Demand IP and IPX Routing with PPP
Commands

Follo wing is the command summary for c onfigu ring the centra l site Cis co 700 series router
router for on-demand IP and IPX routing us ing PPP:

set system
set multidestination on
set ppp auth in chap
set ppp secret client
cd lan
set ipx routing on
set ipx network
set ipx framing 802.2
set ipx rip update periodic
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set user
set bridging off

1

number

set
set 2 number
set ipx network
set ipx routing on
set ipx framing none
set ipx rip update demand
set ipx spoof
set ip route destination
set ip address
set ip netmask
set ip routing on
set ip rip update demand
set ppp auth out chap
set ppp secret host
reboot

central765

73146

172.15.1.100

255.255.255.0

remote765

5553693
5553694

32125

10

0.0.0.0/0

10.32.125.4

255.255.255.0

gateway

10.32.125.7

Basic Configurat ions 3-17

Routing IP and IPX On-Demand

3-18

Cisco 700 Seri es Router Configuration Guide

CHAPTER

4

Using CHAP

This chapt er contains conf igura tion e xa mples for connec ting a Ci sco 700 series router to a
router running Cisco IOS software. In thes e examples, the remote rout er is a Cisco 765
series router, and the central si te router is a Cisco 4500 series route r. Any Cisco 700 series
router can be used in place of the remote Cisco 765 series router. Any router running
Cisco IOS software can replace the cent ral site Cisco 4500 series router.

In thes e ex amp l es, the Ci sco 45 00 s er i es r o ut er seri al - in t er f ac e co n fig u ration is an
ISDN Primary R ate Interfac e (PRI). Depend ing on the route r model us ed at the cent ral site,
the serial interface might be a different type.

In addition, this chapter lists several interoperability is sues that exist between Cisco IOS
software and Cisco 700 series routers. These issues must be considered if you are
connecting your Cisco 700 series router to a router running Cisco IOS software.

This chapter contains the following sections:

• IP Static Routing and Callback with CHAP Authentication

• IP Static Routi ng with CHAP Authenticat ion and MLP

• IP Static Routing with PAP Authentication and MLP

• IP Unnumbered Static Routing and CHAP with MLP

• IP Static and IPX Static Routing with CHAP and MLP

• IPX Static Routing with CHAP a nd MLP

• Multilink PPP Encapsulation

• Dynamic Routing Protocols

• Bridging to a Rout er Running Cisco IOS Software

Using CHAP 4-1

SPID Detection (North America only)

SPID Detection (North America only)

In North Am erica, SPIDs can be automatically dete cted or manually configured. For more
information on SPID detection, see "Setting SPID Autodetection (North America only)"
and "Setti ng SPIDs Manually (No rth America only)" in the "Basi c Configur ations" ch apter .

IP Static Routing and Callback with CHAP Authentication

This sectio n descri bes how to co nf igur e the route rs for Inter net Protocol (IP ) static rout ing
and callbac k with Challenge Handshake Authentica tion Protocol (CHAP).

Figure 4-1 illustrates the configuration used in this example.

Figure 4-1 IP Static Routing and Callback with CHAP Authentication

Serial interface
IP address: 172.16.125.7
IP subnet mask: 255.255.255.0

Ethernet interface
IP address: 192.168.147.9
IP subnet mask: 255.255.255.248

765 CPA4500

Telecommuter PC
IP address:

192.168.147.8

Remote router
ISDN number: 5553693
User profile name: 4500

Ethernet interface
IP address: 172.18.124.2
IP subnet mask: 255.255.255.0

Serial interface
IP address: 172.16.125.1
IP subnet mask: 255.255.255.0

ISDN

Central site router
ISDN number: 5558011
Host name: 4500

S4768

Central site network
IP network: 172.18.124.0

4-2

Cisco700 Series Router Configuration Guide

Remote Cisco 765 Command Summary

Follo wing is t he command summar y for conf igur ing the re mote Cisc o 765 s erie s rout er f or
IP static r outing and callback with CHAP authentication:

set switch 5ess

1

dir

set
set 2 dir
set system
set ppp authentication incoming chap
set ppp secret client
set multidestination on
cd lan
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set ip rip receive v2
set ip rip version 2
set user
set ppp secret client
set ppp secret host
set ip route destination
set ip address
set ip netmask
set ip routing on
set ip framing none
set ppp callback request always

1

set
set 2 ringback
set number
set bridging off
set ip rip update off
set timeout
set active
reboot

directory_number
directory_number

765

192.168.147.9

255.255.255.248

4500

172.16.125.7

255.255.255.0

ringback

5558011

360

number
number

0.0.0.0

gateway

Remote Cisco 765 Command Summary

172.16.125.1

propagate on

Multilink PPP is e nabled b y de fault . If th e Cisco 700 series router is dialing into a host tha t
does not support m ultili nk PPP or that doe s not hav e mult ilink PPP enable d, the Ci sco 700
series router migh t report a misconfiguration. This is most commonly seen when the
Cisco 700 series router is connected to equipment f r om Ascend.

Using CHAP 4-3

IP Static Routing with CHAP Authenti cati on and MLP

IP Static Routing with CHAP Au th entication and MLP

This section describe s how to configure the central site Cisco 4500 series router and the
remote Cisco 765 series router for IP static routing with Challenge Handshake
Authentic ation Protocol (CHAP ) and Multilink Protocol (MLP).

Figure 4-2 is an illustration of the configuration used in this example.

Figure 4-2 IP Static Routing with CHAP Authentication and MLP

Serial interface
IP address: 172.16.125.7
IP subnet mask: 255.255.255.0

Ethernet interface
IP address: 192.168.147.9
IP subnet mask: 255.255.255.248

765 CPA4500

elecommuter PC

IP address:

192.168.147.8

Remote router
ISDN number: 5553693
User profile name: 4500

Ethernet interface
IP address: 172.18.124.2
IP subnet mask: 255.255.255.0

Serial interface
IP address: 172.16.125.1
IP subnet mask: 255.255.255.0

ISDN

Central site router
ISDN number: 5558011
Host name: 4500

S4768

Central site network
IP network: 172.18.124.0

4-4

Cisco700 Series Router Configuration Guide

Remote Cisco 765 Command Summary

Follo wing is the command s ummary t o conf igur e th e remote Ci sco 765 series router for IP
static rout ing with CHAP and MLP:

set switch 5ess

1

dir

set
set 2 dir
set system
set multidestination on
set ppp multilink on
set ppp authentication incoming chap
set ppp authentication outgoing chap
cd lan
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set user
set ppp secret client
set ip address
set ip netmask
set ip routing on
set ip framing none
set ip route destination
set number
set bridging off
set ip rip update off
set ppp secret host
set timeout
demand 2 threshold 32 duration
set active
reboot

directory_number
directory_number

765

192.168.147.9

255.255.255.248

4500

172.16.125.7

255.255.255.0

5558011

360

0.0.0.0

gateway

5

Remote Cisco 765 Command Summary

172.16.125.1

propagate on

Note The set ppp authentication outgoing chap command in this example is not

recommended when connecting to Ascend 4000 or NAS routers.

For detaile d information re gardi ng the commands listed here, refer to the Cis co 700 Series
Router Command Reference.

Using CHAP 4-5

IP Static Routing with PAP Authentication and MLP

IP Static Rout ing with PAP A uthentication and MLP

This section describe s how to configure the central site Cisco 4500 series router and the
remote Cisco 765 series router for Internet Protocol (IP) static routing with Password
Authentication Protocol (PAP) authe ntication.

Figure 4-3 is an illustration of the configuration used in this example.

Figure 4-3 IP Static Routing with PAP Authentication

Serial interface
IP address: 172.16.125.7
IP subnet mask: 255.255.255.0

Ethernet interface
IP address: 192.168.147.9
IP subnet mask: 255.255.255.248

765 CPA4500

Telecommuter PC
IP address:

192.168.147.8

Remote router
ISDN number: 5553693
User profile name: 4500

Ethernet interface
IP address: 172.18.124.2
IP subnet mask: 255.255.255.0

Serial interface
IP address: 172.16.125.1
IP subnet mask: 255.255.255.0

ISDN

Central site router
ISDN number: 5558011
Host name: 4500

S4768

Central site network
IP network: 172.18.124.0

4-6

Cisco700 Series Router Configuration Guide

Remote Cisco 765 Command Summary

Follo wing is the command s ummary t o conf igur e th e remote Ci sco 765 series router for IP
static routing with PAP authe n tication:

set switch 5ess

1

dir

set
set 2 dir
set system
set multidestination on
set ppp multi on
set ppp authentication in pap
set ppp authentication out pap
cd lan
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set ip rip receive v2
set ip rip version 2
set user
set ip route destination
set ip address
set ip netmask
set ip routing on
set ip framing none
set ppp clientname
set ppp password client
set ppp password host
set number
set bridging off
set timeout
set active
reboot

directory_number
directory_number

765

192.168.147.9

255.255.255.248

4500

172.16.125.7

255.255.255.0

765

5558011

360

0.0.0.0

gateway

Remote Cisco 765 Command Summary

172.16.125.1

propagate on

For detaile d information re gardi ng the commands listed here, refer to the Cisco 700 Series
Router Command Reference.

Using CHAP 4-7

IP Unnumbered Static Routing and CHAP with MLP

IP Unnumbered Static Routing and CHAP with MLP

This section describe s how to configure the central site Cisco 4500 series router and the
remote Cisco 765 series router for Internet Protocol (IP) unnumbered routing with
Challen g e Handshake Authentication Protocol (CHAP) authe n tication and Multilink
Protocol (MLP).

Figure 4-4 is an illustration of the configuration used in this example.

Figure 4-4 IP Unnumbered Routing and CHAP Aut hentication with MLP

Ethernet interface
IP address: 192.168.147.9
IP subnet mask: 255.255.255.248

Serial interface
IP unnumbered

Telecommuter PC
IP address:

192.168.147.8

Remote router
ISDN number: 5553693/4
User profile name: 4500

765

ISDN network

Ethernet interface
IP address: 172.18.124.2
IP subnet mask: 255.255.255.0

Serial interface
IP unnumbered

4500

Central site router
ISDN number: 5558011/2
Host name: 4500

Central site network
IP network: 172.18.124.0

S4769

4-8

Cisco700 Series Router Configuration Guide

Remote Cisco 765 Command Summary

Follo wing is t he command summar y for conf igur ing the re mote Cisc o 765 s erie s rout er f or
IP unnumbered routing with CHAP authentication and MLP:

set switch 5ess
set system
set multidestination on
set ppp multilink on
set ppp authentication incoming chap
set ppp authentication outgoing chap
set ppp secret client
set ppp secret host
cd lan
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set ip rip receive v2
set ip rip version 2
set user
set ppp secret client
set ip rip update off
set ip routing on
set ip framing none
set ip route destination
set number
set bridging off
set ppp secret host
set timeout
set active
reboot

765

4500

5558011

360

192.168.147.9

255.255.255.248

0.0.0.0

gateway

Remote Cisco 765 Command Summary

0.0.0.0

For detailed information regarding the commands listed here, refer to theCisco 700 Series
Router Command Reference.

Using CHAP 4-9

IP Static and IPX Static Routing with CHAP and MLP

IP Static and IPX Static Routing with CHAP and MLP

This section describe s how to configure the central site Cisco 4500 series router and
Cisco 765 series router for Internet Protocol (IP) static and Internet work Packet Exchange
(IPX) static routing with Point -to-P oint Protocol (PPP) using CHAP and MLP.

Figure 4-5 is an illustration of the configuration used in this example.

Figure 4-5 IP Static and IPX Static Routing with PPP

Serial interface
IP address: 172.16.125.7
IP subnet mask: 255.255.255.0
IPX network: 32125

Ethernet interface
IP address: 192.168.147.9
IP subnet mask: 255.255.255.248
IPX network: 1478

Telecommuter PC
IP address: 192.168.147.8

Remote router
IPX address:
32125: 0040f9cfd5
ISDN number: 5553693/4
User profile name: 4500

765

Ethernet interface
IP address: 172.18.124.2
IP subnet mask: 255.255.255.0
IPX network: 48124

Serial interface
IP address: 172.16.125.1
IP subnet mask: 255.255.255.0
IPX network: 32125

ISDN network

Central site router
IPX address:
32125: 0c08af65
ISDN number: 5558011/2
Host name: 4500

4500

S4770

IPX file server
IPX internal
address:
3039e670

Central site network
IP network: 172.18.124.0

4-10

Cisco700 Series Router Configuration Guide

Remote Cisco 765 Command Summary

Follo wing is the command s ummary t o conf igur e th e remote Ci sco 765 series router for IP
static and IPX static routing with PPP using CHAP and MLP:

set switch 5ess

1

dir

set
set 2 dir
set system
set multidestination on
set ppp authentication incoming chap
set ppp authentication outgoing chap
set ppp secret client
set ppp secret host
cd lan
set ipx network
set ipx framing 802.2
set ipx routing on
set ipx rip update periodic
set ip address
set ip netmask
set ip routing on
set ip rip update periodic
set user
set ipx network
set ipx routing on
set ipx route destination
set ipx service name CORP_FS1 type 4 address
set ipx spoof
set ipx rip update off
set ipx framing none
set ip routing on
set ip route destination
set ip address
set ip netmask
set ip framing none
set number
set bridging off
set ip rip update off
set timeout
set active
reboot

directory_number
directory_number

765

1478

192.168.147.9

255.255.255.248

4500

32125

10

172.16.125.7

255.255.255.0

5558011

360

3039e670

0.0.0.0

gateway

gateway

Remote Cisco 765 Command Summary

32125:0c08af65

3039e670:01:0451

172.16.125.1

propagate on

Using CHAP 4-11

IPX Static Routing with CHAP and MLP

IPX Static Routing with CHAP and MLP

This section describes how to configure the remote Cisco 765 series router and the central
site Cisco 4500 series router for Internetwork Packet Exchange (IPX) static routing with
Point-to-Point Protocol (PPP).

Figure 4-6 is an illustration of the configuration used in this example.

Figure 4-6 IPX Static Routing with PPP

Ethernet interface
IPX network: 1478

Remote router
IPX address:
32125: 0040f9cfd5
ISDN number: 5553693/4
User profile name: 4500

Serial interface
IPX network: 32125

765

ISDN network

Ethernet interface
IPX network: 23160

Serial interface
IPX network: 32125

4500

Central site router
IPX address:
32125: 0c08af65
ISDN number: 5558011/2
Host name: 4500

S4771

IPX file server
IPX internal
address:
3039e670

4-12

Cisco700 Series Router Configuration Guide

Remote Cisco 765 Command Summary

Follo wing is t he command summar y for conf igur ing the re mote Cisc o 765 s erie s rout er f or
IPX static routing with PPP:

set switch 5ess

1

dir

set
set 2 dir
set system
set multidestination on
set ppp auth in chap
set ppp secret client
set ppp secret host
set multilink on
cd lan
set ipx network
set ipx framing 802.2
set ipx routing on
set ipx rip update periodic
set user
set ppp secret client
set ipx network
set ipx routing on
set ipx route destination
set ipx service name CORP_FS1 type 4 address
set ipx spoofing
set ipx rip update off
set ipx framing none
set number
set bridging off
set timeout
set active
reboot

directory_number
directory_number

765

1478

4500

32125

10

5558011

360

3039e670

gateway

Remote Cisco 765 Command Summary

32125:0c08af65

3039e670:01:0451

For detailed information regarding the commands listed here, refer to theCisco 700 Series
Router Command Reference.

Using CHAP 4-13

Multilink PPP Encapsulat ion

Multilink PPP Encapsulation

Cisco 700 series routers imple ment mult il ink PP P, which is av a ilabl e in Release 11.0(3) or
later of Cisc o I OS software. You can disable multilink PPP in the following two
environments:

• You are co nnecting your Cis co 7 00 se ries rout er to a rout er running a Cisco IOS r elease

prior to 11.0(3).

• You are c onnecting your Cisco 700 series router to a router running Cisco IOS Release

11.0(3) or la ter , and you h ave no t conf igured mul tilink PPP on that rou ter runni ng Cisco
IOS.

Use the set ppp multilink command at the system level to disable multilink PPP, as
follows:

766> set ppp multilink off

Dynamic Routing Protocols

Cisco 700 se ries routers imple ment RIP Versions 1 a nd 2 and de mand RIP. Demand RIP is
not implemented in Cisco IOS software. If you are connec ting your router to a router
running Cisco IOS software, a nd you want to use a dynamic routing protocol, you must
disable de mand RIP.

Use one of the following set ip rip update commands to disable demand RIP:

766> set ip rip update periodic / snapshot

or

766> set ip rip update none

Note Setting the IP RIP updat e to periodic maintains the connection indefinitel y. This

might be a conc ern if it is no t necess ary to ma intai n the line 24 hou rs a day, 7 days a week;
you are paying for connection time that you are not using.

4-14

Cisco700 Series Router Configuration Guide

Bridging to a Router Running Cisco IOS Software

Bridging to a Router Running Cisco IOS Software

It is possibl e to bridge data o ver ISDN to and from Cisco ISDN routers. Dependin g on your
network environment, this might be an ide al s olution. Bridging offe rs c onfiguration
simplicity with few concer ns regarding network address space limitatio ns a nd unroutable
protocols. Bridging also offers compatibility with other products that need to bridge.

When bridging, you do not have the same ISDN line c ontrol that routing access lists
provide. When bridging protoc ols such as Novell IPX, AppleTalk, or NetBIOS, it is
possible for the ISDN line to remain connected for long periods of time. This can result i n
high ISDN usage charges. If bridging is the only solution for your environment, we
recommend monitoring the ISDN line connection.

Cisco IOS Release 11.1 and earlier li mit the number of simult aneous ISDN bridge sessions
to one per in terf ace .

Prior to Cisco IOS Release 11.2 (half-bridging), the Cisco IOS must also b e configured to
the bridging protocol, not the route r protocol.

Using CHAP 4-15

Bridging to a Router Running Cisco IOS Software

4-16

Cisco700 Series Router Configuration Guide

CHAPTER

5

Configuring DHCP Relay,
DHCP Server, and PAT

Cisco 700 series routers can perform the role of the relay age nt, relaying IP configuration
information request packets from the LAN interfa ce, ove r the ISDN interf ace, to a specif ied
Dynamic Host Configuration Protocol (DHCP) serv er. Cisco 700 series routers provide
DHCP relay, DHCP server, Port Address Translation (PAT), and Inter net Protocol Control
Protocol (IPCP).

This chapt er provides descriptions, appl ication notes, and example configurations for
configuring Dynamic Host Configuration Protocol (DHCP) relay, DHCP serve r, and Port
Address Translation (PAT) on the Cisco 700 series router. It contains the following
sections:

• DHCP Description

• PAT Description

• IPCP Description

• PPP IPCP Negotiation Example

• DHCP Relay with IPCP Negotiation Example

• DHCP Server with IPCP Negotiation Example

• PAT with IPCP Single-Destination Negotiation Example

• DHCP Server and PAT with IPCP Single-Destination Negotiation E xam ple

• DHCP Server with PAT and IPCP Dual-Destination PPP Negot iation Example

Configuring DHCP Relay, DHCP Server, and PAT 5-1

DHCP Description

DHCP Description

DHCP is a client-server protocol that allows devi ces on an IP netw ork (the DHCP clients)
to request configuration information from a DHCP server. DHCP allocates network
addresses from a cent ral pool on an as-needed basis. DHCP is usef ul for assigning IP
addresses to hosts conne cted to th e network temporar ily or for shar ing a limite d pool of IP
addresses among a group of hos ts that do not need permanent IP addresses.

DHCP allows for increased automation and fewer network a dmi nistration problems by:

• Eliminat ing the need for the manual co nfigurat ion of indivi dual computers, printers, and

shared file systems.

• Preventing the simultaneous us e of the same IP address by two clients.

• Allowing configuration from a central site.

DHCP Server Application Notes

The following are application notes for DHCP server:

• DHCP relay and DHCP server are mutually exclusive.

• When DHCP server is initialized, default a ddr esses are used if no LAN or internal

address ex ists . Th e Cis co 700 se ries router p ick s up th e DHCP cli ent’s default ga te wa y ,
netmask, and starting DHCP addresses by using the LAN IP address, if one exists . If a
LAN address does not exist, the router uses the internal IP address. If neither exists, it
uses the default settings: 10.0.0.1 as th e LAN IP address (default gateway for DHCP
client s), 255.0.0.0 as th e s ubnet mask, and 10.0.0.2 as the starti ng DHCP client
addresses.

• For the DHCP values to be automatic ally generated based on the LAN or internal IP

address, each DHCP value must be set to 0.0.0.0 or none, for the new v alues to take
effect.

5-2

Cisco700 Series Router Configuration Guide

DHCP Relay Applica tio n Notes

The following are application notes for DHCP relay:

• The IP ad dr ess in t he I nt ern al pro f il e must be o n the sam e netw ork as t hat of the DHCP

client s.

• A firewall configuration (where there is an Inte rnal profile and LAN IP address) does

not work with DHCP relay.

• A configura tion where PAT is on and DHCP relay is enabled is not v alid. DHCP relay

will attempt to cross from a public to a private domain. PAT prevents access to the

priv ate domai n. DHCP r ela y fa ils becau se i t must refere nce the rou ter’s priv ate addre ss.

• DHCP relay an d DHCP server are mutually exclusive. The Cisco 700 series router can

function as one or the other, but not both.

PAT Description

DHCP Relay Application Notes

Cisco 700 series routers pro vide PAT, ena bling local hosts on a private IP network to
communicate externally.

Packets destined for an external address have their private IP address plus port number

trans l at ed t o th e ro ut er ’s extern al IP addr es s bef ore the I P pac k et i s f orw ar de d t o the WAN.
IP packets returning to th e router have their external IP addresses (plus port number)
trans lated back to the private IP addresses, and the packets are forwarded to the LAN.

When PAT is enabled, the transmission of RIP packets is automatically disabled to prevent
a broadcast of the private IP add resses externally.

PAT Application Notes

A configura tion where PAT is on and DHCP relay is enabled is not v al id. DHCP rela y will
attempt to c ross from a public to a private domain. PAT prevents access to the priv ate
domain. DHCP relay fails becaus e it must referenc e the router’s private address.

Configuring DHCP Relay, DHCP Server, and PAT 5-3

IPCP Descripti on

IPCP Description

If you are using IP routing, Cisco 700 s eries rout ers must be conf igured for IPCP t o connect
to routers running Cisco IOS software. Use the set ip framing command in profile mode
to enable IPCP for user-defined WAN profiles by setting IP framing to none.

The following example illustrates IPCP enabled by disabling IP framing:

766:2503> set ip framing none

Note Do not set the ip framing or the ipx framing co mman d s to none when configuring

the permanent LAN prof ile.

IPCP Address Negotiation Application Notes

The following are application notes for IPCP address negoti ation:

• Cisco 700 ser ies router s require a user -def ined profi le, conf igured with IP routing on, to

receive an IPCP addr esses .

• A router running Cisco IOS software must be configured to hand off IPCP addresses.

• If a manually configured IP address exists on the Internal profile of a Cisco 700 series

router, the IP CP address is assigned to the WAN profile.

• If a manually configured IP address exi st s on the LAN profile, the IPCP addre ss is

assigned to the Internal profile.

5-4

Cisco700 Series Router Configuration Guide

PPP IPCP Negotiation Example

This section describes how to config ure a remot e Cisco 700 series router for PPP IPCP
negoti ation t o a cent ral s ite rout er , such a s a Cisc o 4500 series router, that is runni ng Cis co
IOS software.

Figure 5-1 is an illustration of the configuration used in this example.

Figure 5-1 PPP IPCP Negotiation

ISDN network

PPP IPCP Negotiation Example

Cisco 765 Cisco 4500

Cisco 765 Series Router Commands

Following are the commands for configuring the remote Cisco 765 series router for
point-to-point IPCP negotiation with a Cisco 4500 router:

set switch 5ess

1

dir

set
set 2 dir
set system
set user
set ppp secret client
set ppp password client
set active
set 1 number
set 2 number
set ip routing on
set ip route destination
set ip rip version 2
set ip rip receive v2
set ip rip update linkup
reboot

directory_number
directory_number

765

4500

phone_number
phone_number

0.0.0.0/0

gateway

H9230

0.0.0.0

For detaile d information re gardi ng the commands listed here, refer to the Cisco 700 Series
Router Command Reference.

Configuring DHCP Relay, DHCP Server, and PAT 5-5

DHCP Relay with IPCP Negotiation Example

Verify the Configuration

Y ou can use the show ip configuration all and show ip route all comman ds t o se e the IPCP
negotiation address.

DHCP Relay with IPCP Negotiation Example

This section describes how to config ure a remot e Cisco 700 series router for DHCP relay
with IPCP negotiation to a central-site router running Cisco IOS software.

Figure 5-2 is an illustration of the configuration used in this example.

Figure 5-2 DHCP Relay with IPCP Negotiation

DHCP

client

DHCP relay agent

ISDN network

Cisco 765

Cisco 765 Series Router Commands

Follo wing are the comm ands for confi guri ng th e remote Ci sco 765 series router for DHCP
Relay with IPCP Negotiation with a Cisco 4500 router:

set system
set dhcp relay
set user
set 1 number
set 2 number
set ip routing on
set ip rip version 2
set ip rip receive v2
set ip rip update linkup
reboot

765

172.168.100.2

4500

phone_number
phone_number

172.168.100.2Cisco 4500

DHCP

server

H9231

For detaile d information re gardi ng the commands listed here, refer to the Cisco 700 Series
Router Command Reference.

5-6

Cisco700 Series Router Configuration Guide

Verify the Configuration

Verify the Configuration

You can use the show ip co nfiguration and show ip route commands to see the IPCP
negotiation address.

You can use the show dhcp configuration command to see the IP address returned by
DHCP.

DHCP Server with IPCP Negotiation Example

This sect ion describ es how to configu re a remote Ci sco 700 series router a s a DHCP serve r
with IPCP negotiation to a central-site router running Cisco IOS software.

Figure 5-3 is an illustration of the configuration used in this example.

Figure 5-3 DHCP Server with IPCP Negotiation

DHCP

client

DHCP

server

Cisco 765

ISDN network

Cisco 4500

H9232

Configuring DHCP Relay, DHCP Server, and PAT 5-7

DHCP Server with IPCP Negotiation Example

Cisco 765 Series Router Commands

Follo wing are the commands for c onfiguri ng the remot e Cisco 765 se ries router as a DHCP
server with IPCP negotiation with a Cisco 4500 router:

set switch NI-1

1

dir

set
set 2 dir
set 1 spid
set 2 spid
set system
set dhcp server
set dhcp address
set dhcp netmask
set dhcp gateway primary
cd lan
set ip address
set ip netmask
set ip routing on
set user

set ip routing on

set active

1

set

2

set
set ip routing on
set ip rip version 2
set ip rip receive v2
set ppp address negotiation local on
set ip rip update periodic
reboot

5551211
5551212

88855512110101
88855512120101
765

4500

number
number

172.168.1.2 128

255.255.255.0

172.168.1.1

255.255.255.0

phone_number
phone_number

172.168.1.1

For detaile d information re gardi ng the commands listed here, refer to the Cisco 700 Series
Router Command Reference.

Verify the Configuration

When a call is made, you can us e the show ip configuration all and show ip route all
commands to see the IPCP negotiation addres s.

You can use the show dhcp configuration command to see the IP address returned by
DHCP.

5-8

Cisco700 Series Router Configuration Guide

PAT with IPCP Single-Destination Negotiation Example

PAT with IPCP Single-Destination Negotiation Example

This sect ion descri bes ho w to c onfigu re a remote Cisco 700 series r outer f or P AT with IPCP
single-destination negotiation to a central-site router running Cisco IOS software.

Figure 5-4 is an illustration of the configuration used in this example.

Figure 5-4 PAT with IPCP Si ngle-Destination Negot iat ion

Internal

FTP

server

10.0.0.2

10.0.0.1

IPCP negotiated

address assigned

profile

Cisco 765

ISDN network

Cisco 4500

PAT on

A

H9233

Private

network

Public

network

Configuring DHCP Relay, DHCP Server, and PAT 5-9

PAT with IPCP Single-Destinat ion Negotiation Example

Cisco 765 Series Router Commands

Following are the commands for configuring the remote Cisco 765 series router for PAT
with IPCP single-destination negotiation with a Cisco 4500 router:

set system
set ip pat po ftp
cd lan
set ip address
set ip netmask
set ip routing on
set user
set active
set 1 number
set 2 number
set ip routing on
set ip rip version 2
set ip rip receive v2
set ip pat on
reboot

765

4500

phone_number
phone_number

For detaile d information re gardi ng the commands listed here, refer to the Cisco 700 Series
Router Command Reference.

Verify the Configuration

When a de m a n d ca ll is m ad e , yo u can use the show ip config all and show ip route all
commands to see the IPCP negotiation addres s.

10.0.0.2

10.0.0.1

255.0.0.0

You can use the show ip pat command to see the services returned by PAT.

5-10

Cisco700 Series Router Configuration Guide

DHCP Server and PAT with IPCP Single-Destination Negoti ation Example

DHCP Server and PAT with IPCP Single-Destination
Negotiation Example

This section describes ho w to config ure a remote Cisco 700 series router for DHCP server
with PAT and IPCP single-destination negotiation to a Cisc o 4500 series router running
Cisco IOS software at a central site.

Figure 5-5 is an illustration of the configuration used in this example.

Figure 5-5 DHCP Server with PAT and IPCP Single-Destination Negotiation

Cisco 765

Private

network

PAT on

ISDN network

Cisco 4500

H9234

Public

network

Configuring DHCP Relay, DHCP Server, and PAT 5-11

DHCP Server and PAT with IPCP Single-Destination Negotiation Example

Cisco 765 Series Router Commands

Following are the commands for configuring the remote Cisco 765 series router for PAT
with IPCP single-destination negotiation with a Cisco 4500 router:

set system
set ppp secret client
set ppp password client
set dhcp server
set dhcp address
set dhcp netmask
set dhcp gateway primary
set ip pat porthandler ftp
cd lan
set ip routing on
set ip address
set ip netmask
set user
set 1 number
set 2 number
set ip routing on
set ip route destination
set ip address
set ip netmask
set ip pat on
set active

765

172.168.99.1

255.255.255.0

4500

phone_number
phone_number

0.0.0.0

0.0.0.0

172.168.99.2 128

255.255.255.0

172.168.99.1

172.168.99.3

0.0.0.0/0

gateway

0.0.0.0

For detaile d information re gardi ng the commands listed here, refer to the Cisco 700 Series
Router Command Reference.

Verify the Configuration

When a de m a n d ca ll is m ad e , yo u can use the show ip config all and show ip route all
commands to s ee the IPCP ne goti ation addre ss. You can also use the show dhcp config and
show ip pat commands to verify the configuration.

5-12

Cisco700 Series Router Configuration Guide

DHCP Server with PAT and IPCP Dual-Destination PPP Negotiation Example

DHCP Server with PAT and IPCP Dual-Destination PPP
Negotiation Example

This section describes ho w to config ure a remote Cisco 700 series router for DHCP server
with PAT and IPCP dual-destination PPP negotiation to two routers running Cisco IOS
software.

Figure 5-6 is an illustration of the configuration used in this example.

Figure 5-6 DHCP Server with PAT and IPCP and Dual-Destination PPP Negotiati on

DHCP server

Cisco 4500

ISDN network

Cisco 765

Cisco 2500

S5815

Configuring DHCP Relay, DHCP Server, and PAT 5-13

DHCP Server with PAT and IPCP Dual-Destination PPP Negotiation Example

Cisco 765 Series Router Commands

Follo wing are the commands for c onfiguri ng the remot e Cisco 765 se ries router as a DHCP
server with PAT and IPCP multilink PPP to two router s running Cisco IOS softwa re:

set system
set ppp secret client
set ppp password client
set dhcp server
set dhcp address
set dhcp netmask
set dhcp gateway primary
set ip pat porthandler ftp
cd lan
set ip routing on
set ip address
set ip netmask
set user
set ppp clientname
set 1 number
set 2 number
set ip routing on
set ip route destination
set ip address
set ip netmask
set ip pat on
set active
set user
set ppp clientname
set 1 number
set 2 number
set ip routing on
set ip route destination
set ip address
set ip netmask
set ip pat on
set active

765

172.168.99.2 128

255.255.255.0

172.168.99.1

172.168.99.1

255.255.255.0

2500

2500
phone_number
phone_number

0.0.0.0/0

30.169.100.1

255.255.255.0

4500

4500
phone_number
phone_number

120.50.40.0/0

173.100.10.1

255.255.255.0

172.168.99.3

gateway

30.169.100.2

gateway

173.100.10.2

Note If you create a mult ipl e d estina tio n conf igur at ion with PAT enabled in bot h prof ile s,

the IP route destination must be specified, using the set ip route destination co mmand .

5-14

Cisco700 Series Router Configuration Guide

Verify the Configuration

When a de m a n d ca ll is m ad e , yo u can use the show ip configuration all command to see
the IPCP negotiation address.

You can use the show dhcp connections command to see the IP addresses returned by
DHCP.

Verify the Configuration

Configuring DHCP Relay, DHCP Server, and PAT 5-15

DHCP Server with PAT and IPCP Dual-Destination PPP Negotiation Example

5-16

Cisco700 Series Router Configuration Guide

CHAPTER

6

Configuring Re mote CAPI

This chapt er provides procedures for configuring Rem ote Common Application
Programming Inte rface (CAPI) support on a Cisco 700 series router.

CAPI is an application programming in terface standard used to access ISDN equipment
connected to Basic Rate Interfaces (BRIs) and Primary Rate Interf ac es (PRI s). CAPI
prov ides a standar dized int erfac e that al lows app licat ion program s to use ISDN dri ver s and
controll ers. One appl ication can us e one or more c ontrollers . Sev eral appl ications ca n share
one or more controlle r s.

CAPI provi des a selection mechanism that s upports applic ations that use different p rotocols
at dif ferent prot ocol le vels. CAPI also pro vides sta ndardized ne twork acc ess by performing
an abstrac tion from different protocol variables. All connection-related data, such as
connection state, display messages, and so on, is available to the applications at any time.

The framing protocols supported by CAPI consist of High-Level Data Link Control
(HDLC), HDLC inverted, bit-transparent (speech), and V.110 synchronous/asynchronous.

CAPI integrates the following data link and network layer protocols:

• Link Access Procedure on the D channel (LAPD) in accordance with Q.921 for X.25

D-channel implementation

• Point-to-Point Protocol (PPP)

• ISO 8208 (X.25 DTE-DTE)

• X.25 DCE, T.90NL, and T.30 (fax group 3)

Configuring Remote CAPI 6-1

CAPI and RVS-COM

CAPI and RVS-COM

The Cisco 700 serie s router s upports the ISDN De vice Control Protocol (I SDN-DCP) from
RVS-COM. ISDN-DCP allows a workstation on the LAN to use legacy dial computer
telephony integrat ion ( CTI) application s. These applicatio ns include fax transm itting and
receiving and placing and receiving phone calls.

Using ISDN-DCP, the router acts as a DCP serv er. By default, the router listens for DCP
messages on TCP port number 2578 (the Internet-assi gned number for RVS-COM DCP)
on its LAN port.

When the r outer re cei ve s a DC P message from a DCP cli ent (c onnect ed to t he LAN port of
the route r), the router processes the message and acts o n it. The actions consist of sending
confirmations to the DCP clients and sending ISDN packets through the router BRI port.

When the router receives a packet on its BRI port for one of the DCP clients, the router
formats the pack et as a DCP message and sends it to the corresponding cl ient. The router
supports all the DCP messages specified in the ISDN-DCP specific ation.

The router provides two 64-kbps B channels to CAPI cli ents. Each B channel can be
configured separately to work in either HDLC mode or bit-transparent mode. For CAPI
support, the higher layer protocols (B2 through B7) are transparent to the applications
using these B channels.

The ISDN Core Engine of RVS-COM supports the following B channel protocols:

• CAPI layer B1

— 64 kbps with HDLC framing
— 64-kbps bit-tra nsparent operation with byte framing from the network
— T.30 modem for fax group 3
— Modem with full negotiation

• CAPI layer B2

— X.75 SLP (ISO 7776) with V.42bis compression option (negotiated)
— V.120 with V.42bis compression opti on (negotiated)
— Transparent
— T.30 modem for fax group 3

6-2

Cisco700 Series Router Configuration Guide

Supported D-Chann el Protocols

— Modem with full negotiation

• CAPI layer B3

— Transparent
— T.90NL with compatibility with T.70NL, according to T.90 Appendix II
— ISO 8208 (X.25 DTE-DTE) modulo 8 and windows size 2, no multiple logical

connections

— T.30 for fax group 3
— Modem with full negotiation

• T.30 for fax group 3 (SFF fi le format [default], sending and receiving up to 14400 bps

with ECM option, mo dulations V.17, V.21, V.27ter, V.29)

• Analog modem (sending and re ceiving up to 14400 bps with V.42 error correction and

V.42bis compression option, modulations V.21, V.22, V.22bis, V.23, V.32, V.32bis)

Supported D-Channel Proto cols

CAPI support is available only for the ISDN swit ch type Net3.

Supported Applications

ISDN-DCP supports CAPI and non-CAPI a pplications. Supported applications consist of
those that use one or two B channels for data transfer, different HDLC- bas ed protocols,
Euro File trans fer , or fax G4; also support ed are appli ca tions that send b it-tra nspare nt data,
such as A/Mu lay audio, fax G3, analog modem, or analog telephones.

Remote CAPI Rout er Commands

The commands used in this chapter have been added to the router user interface to support
CAPI. Note t hat CAPI run s on a remote ne twork de vice, not the ro uter; the Cis co 700 seri es
router enables remote CAPI applications.

Configuring Remote CAPI 6-3

Configuring t he Cisco 700 Router as an RCAPI Server

Configuring the Cisco 700 Router as an RCAPI S erver

This secti on des cribes how to configure t he Cis co 700 se ries rout er t o be an RC API serv er.
By defaul t, RCAPI is disabled in the router. Enabling RCAPI causes the rout er to become

an RCAPI server. When RCAPI is enable d , the rou ter listens for incoming RCAPI
messages from PCs connected on its LAN side. By default, the router listens for RCAPI
messages on TCP port 2578.

Figure 6-1 illustrates the configuration used in this example. The PCs in the figure have
RVS-COM software in stalled.

Figure 6-1 RCAPI Server Configuration Example

Local PC Remote PC

IP address

192.168.2.2

Local 7xx

router

IP address

192.168.2.1
Directory numbers
5554000/5552000

RCAPI Command Summary

Foll owing is the command summary for configuring the RCAPI on the local Cisco 700
series router.

set rcapi on
set dir
set rcapi 1 number
set rcapi server port
reboot

5554000

5554000

2578

Remote 7xx

router

IP address

192.168.3.1
Directory numbers
5553000/551000

IP address

192.168.3.2

26547

6-4

Cisco700 Series Router Configuration Guide

Verify the Configuration

You can u se the command show rcapi status to see the status of RCAPI server, the clients
that are in the listening state, and the status of RCAPI calls:

local-router> show rcapi status
Rcapi Sever ON
Rcapi Server Port 2578
Rcapi Number(s) 5554000

CLIENT SESSION-ID LISTEN CONNECTION-ID TYPE CALL-STATUS

------------------------------------------------------------------------

192.168.100.3 16777218 ON

Verify the Configuration

Configuring Remote CAPI 6-5

Configuring t he Cisco 700 Router as an RCAPI Server

6-6

Cisco700 Series Router Configuration Guide

APPENDIX A

Token Card and Cisco Secure
Authentication Support

This appendix provides Token Card and Cisco Secure Authentication support concepts as
they app ly to the Cisco 700 serie s router. Cisco Sec ure Authentication Age nt supports
single-user mode, which extends B channel authentication to a Cisco Secure
Authentication Agent client.

T ok en ca rds a re cons idere d the most secur e auth enti cation solu tion a v ailab le. The re ar e tw o
kinds of token cards, synchronous and asynchronous. Currently, Cisco Secure
Authentic ation Agent only supports synchronous token card, which does not nee d a
challenge from a token server to generate a token.

Figure A-1 shows the connection between the client and the token ser ver.

Figure A-1 Cisco Secure Authent ication Agent Client-to-Token Server

Connection

LAN ISDN LAN LAN

10259

Cisco Secure AA

client

The follow ing steps illustrate how a link is established using a profile:

Step 1 Deman d traffic or a ca ll command makes a conn ection.
Step 2 The router sends a User Datagram Protocol (UDP) packet to a Token

Authorization agent (also known as Cisco Secure Authentication Agent),
requestin g a usernam e and passw ord for PAP and CHAP . If T o ken Authori zation
Support (TAS) is set to central, the router always sends the authentication
information request to the des ig nated client.

Cisco 700 NAS Authentication

Authorization

Accounting

Token
server

Token Card and Cisco Secure Auth entication Support A-1

Token Caching

Otherwise, the router sends the request to the source of the interesting packet
rece iv e d if t he i nte res ti ng pa ck et is an IP pack et . T he ro ute r s ends t h e re que st to
the designated clie nt if the interesting packet is not an IP packet.

Step 3 The agent software recognizes the UDP/IP packet and opens an authentication

window on the terminal. The user enters the username and token. The agent
organiz es the information into the PAP and CHAP username and password,
based on the router conf igurati on. It t hen sends t he username and password bac k
to the ro ut er as a r ep l y p ac ket .

Step 4 The reply packet is received, and the router opens an ISDN connection with

Network Access Server (NAS).

Step 5 The router negotiates all line-control protoc ol options, including which

authentication protocol to us e (PAP or CHAP).

Step 6 Depending on which a uthent icat ion proto col is ne goti at ed, th e route r asse mbles

a PAP request or CHAP response packet and sends it to NAS. If authentication
fails, NAS passes the failure message from authentication, authorization, and
accounting (AAA) to the route r . The route r sends one more req uest to the agent
with a mess age t o retry once more . If auth entic ation fa ils aga in, t he router s ends
another PAP request with the pppautheninfotype parameter set to
message-only to inform the Cisco Secure Authentication Agent client that the
authentication failed again and that the router has stopped author ization
attempts.

Token Caching

Cisco 700 series routers do not do to ken caching. A token is cached at the client, and the
client sends the router the cached token in response to the authentication request from a link
that uses a multilink PPP bundle. With its built-in algorithm, the agent can also generate a
new token, called a soft token, instead of prompt ing the user to enter a new hard token.

There ar e two authe ntication modes, PAP and CHAP local se cret, shown in the f o llowing
figure s.

A-2

Cisco700 Series Router Configuration Guide

Figure A-2 PAP Client Packet

Token Caching

Client

username

token

Figure A-3 CHAP Local Secret

Client

username*token

PPP PAP Packet

username

token

Cisco 700 Series Router Configuration

authorization protocol = PAP
local secret = N/A

PPP PAP Packet

MD5 (challenge, knock)username*token

Cisco 700 Series Router Configuration

authorization protocol = CHAP
use local secret = Yes
secret = knock

10260

10262

Token Card and Cisco Secure Auth entication Support A-3

Token Caching

A-4

Cisco700 Series Router Configuration Guide

INDEX

Numerics

5ESS 3-6

A

Address Resolution Protocol

See ARP
address, MAC 3-8
addressing, DHCP 5-2
AppleTalk 4-15
ARP, sup ported protocol 1-1
authentication 2-4

CHAP 3-4

PPP 3-8
autodetection

set autodetection command 3-5

troubleshooting 3-6

B

B channel 3-6
BCP, supported protocol 1-1
Bridge Control Protocol

See BCP
bridgi ng 3-7, 4-15

configuration example 3-7

interoperability issues 4-15

C

CAPI 6-1
caution description x
cd command 2-5

Challenge Ha ndshake Authentication Protocol

See CHAP
changing a profile name 2-6
CHAP 3-10

auth entication 3-10

configuration example

IP static routing and callback 4-2
IP static routing with MLP 4-4
IP unnumbe red routing w ith MLP 4-8

with Cisco IOS software 4-2, 4-4, 4-8
secret 3-4
supported protocol 1-2

Cisco Fast Step 1-3
Cisco Internetwork Operating System

See Cisco I OS

Cisco IOS

configuration vii, 4-1
Release 11.0(3) 4-14
Release 11.1 4-15
softw are, interoperability with IPCP and IPX C P 5-4
with bridging 4-15

Cisco IOS-700 software 1-2
command reference viii
Common Appli cation Programming Interface

See CAPI
See Remote CAPI

configuration

bridging exampl e 3-7
changing profiles 2-2
displaying profiles 2-5
example

bridging 3-7

IP static and callback with CHAP 4-2

IP static with CHAP and MLP 4-4

IP static with PAP 4-6

IP unnumbered and CHAP with M LP 4-8

RCAPI 6-4

routing a Cisco 700 series router 3-9

rout ing IP an d IPX on -demand 3-14

Index 1

routing to an ISP 3-9
ISDN PRI 4-1
line 3-5
options 1-3
port 1-3
profiles 2-1
Remote CAPI example 6-4
system level 2-2
Telnet 1-3
Web s ources viii

connect ions

ISP 3-9

creating profiles 2-5

D

deleting profiles 2-6
dema nd RIP 4-14
DHCP

clients 5-2
defa ult gat e w a y 5 -2
network addresses 5-2
relay 5-1

with IPC P ne go tiatio n 5-6
server 5-2

with IPC P ne go tiatio n 5-7

with PAT and IPCP dual-destinati on PPP

negotiation 5-13

with PAT and IPCP single-destination

negotiation 5-11

supported protocol 1-2

DMS-100 ISD N BRI switch 3-7
document conventions ix
documentation viii
documentation CD-ROM viii
Dynamic Host Configuration Protocol

See DHCP

F

firewall 5-3

I

ICMP, supported protocol 1-1
image (s oftware) 1-3
Integrated Services Digita l Networ k

See ISDN
Internal profile 2-4, 5-3
Internet Control Message Protocol

See ICMP
Internet Packet Exchange Control Protocol

See IPXCP
Internet Protocol Control Protocol

See IPCP
Internet service provider

See ISP
Internetwork Packet Exchange

See IPX
inter o pe ra bility w ith Ci sc o IO S sof tw a re

bridging 4-15

IPCP and IPXCP 5-4

multi li nk PP P en ca p su la tion 4-1 4
IP 3-14, 3-17

configuration example

IP static and callback with CHAP 4-2
IP static with CHAP and MLP 4-4
IP static with PAP 4-6
IP unnumbered and CHAP with M LP 4-8
rout ing IP an d IPX on -demand 3-14

DHCP

network addresses 5-2
relaying configuration infor m ation 5-1

unnumbe red IP address 3-9
IPCP

interoperability 5-1

supported protocol 1-1

Cisco 700 Series Rout er Configuration GuideIndex 2

IPX 3-14, 3-17

configuration example, r outing IP and IPX

on-demand 3-14

IPXCP

interoperability issues 5-1
supported protocol 1-1

ISDN

BRI number 3-6
PRI conf iguration 4-1

ISDN Devi ce Control Protocol

See ISDN-DCP
ISDN-DCP, supported protocol 1-2
ISP, connections 3-9

L

N

NCP 3-11
NetBIOS 4-15
network address

DHCP 5-2
space limitations 4-15

Network Control Protocol

See NCP
NI1 swit ch 3-7
nonvolatile random access m em ory

See NVRAM
note, description x
Novell IPX 4-15
NVRAM 2-1

LAN

Ethernet 10BaseT connection 3-2

profile 2-4
LCP 3-11
line configuration 3-5
Link Cont rol Protocol

See LCP

M

MAC addres s table 3-8
MLP, configuration example

IP static routing with CHAP 4-4

IP unnumbe red routing with CHAP 4-8
MLPPP

encapsulation 4-14

supported protocol 1-1
Multili n k Po int -to-P oint Protocol

See MLPPP

O

operating system (router) 1-1
overview of Cisco 700 series router s 1-1

P

PAP 3-4

configuration example

IP static routing 4-6
with a router running Cisco IOS software 4-6

supported protocol 1-1

Password A uthentication Protocol

See PAP
PAT with IPCP single-destination negotiation 5-9
PAT, supported protocol 1-2
permanent profiles 2-4, 2-6
Point-to-Point Protocol

See PPP
Port Address Translation

See PAT

Index 3

PPP 3-11

configuration example

routing IP and IPX on-demand 3-14
IP and IPX routing 3-14
IPCP negotiation 5-5
mul til in k enc a ps u la tio n , in terop er ab i lit y 4-14
supported protocol 1-1

private IP addresses 5-3
profile-level param eters 2-1
profiles

active 2-2, 2-6
changing a profile name 2-6
creating 2-5
definition 3-2
deleting 2-6
displayi ng configurations 2-5
inactive 2-2, 2-6
on-demand 2-2
parameters 2-2
permanent 2-4

Internal 2-4

LAN 2-4

Standard 2-4
redefined values indicat or 2-5
removing parameters 2-5
system mode parameters 2 -3
user-def ined 3-10
using with the routers 2-1 to 2-7

protocols supported 1-1

Q

quic k reference viii

R

release notes for Cisco IOS 70 0 software viii
Remote CAPI 6-3

configuration 6-4
configuration example 6-4

TCP port 6-4
Remote CAPI, supported protocol 1-2
Remote Common Application Programm ers Interface

See RCAPI
removing profile parameters 2-5
reset user command 2-6
RIP

dynamic routing protocols 4-14

PAT enabled 5-3

supported protocol
router manuals viii
routing

configuration example

bridging 3-7
central site 3-11
routing a Cisco 700 series router 3-9
rout ing IP an d IPX on -demand 3-14
routing to an ISP 3-9

Routing Information Protocol

See RIP

S

SAP, supported protocol 1-1
secret, CHAP 3-4
Service Advertisement Protocol

See SAP
set autodetection command 3-5
set default command 3-4
set ip framing command 5-4
set ip rip update command 4-14
set ppp multilink command 4-14
set profile user command 2-6
set switch command 3-6
set user command 2-3
show commands, defined 2-5
show configuration command 3-3

Cisco 700 Series Rout er Configuration GuideIndex 4

show dhcp configuration 5-7
show dhcp connections 5-15
show ip configuration command 5-6
show ip route command 5-6
show rc api status command 6-5
Simple Network Management Protocol

See SNMP commands
SNMP, sup ported protocol 1-2
softw a re image 1-3
software, Cisco IOS-700 1-2
SPIDs 3-6

autodetection 3-5

definintion 3-5

troubleshooting 3-6
supported protocols 1-1

ARP 1-1

BCP 1-1

CHAP 1-2

DHCP 1-2

ICMP 1-1

IPCP 1-1

IPXCP

ISDN-DCP 1-2

MLPPP 1-1

PAP 1-1

PAT 1-2

PPP 1-1

RCAPI 1-2

RIP

SAP 1-1

SNMP 1-2

TFTP 1-2
system m ode

configuration parameters 2-2

parameters 2-1

T

TFTP server 1-2
TFTP, supported protocol 1-2
timesaver, description x
Triggered RIP 1-2
Trivial File Transfer Protocol

See TFTP

U

unnumbered IP address 3-9
unroutable protocols 4-15
unset command 2-5

W

WAN ISDN ports 3-2
World Wide Web viii

Index 5