Cisco 870-Series Router Manual PDF (Setup & Configuration Guide)

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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

OL-5332-01

Chapter 13

Configuring Dial Backup and Remote Management

Dial Backup Feature Limitations

!

dsl operating-mode auto

!

! Dial backup interface, associated with physical BRI0 interface.

! Dialer pool 1 associates it with BRI0’s dialer pool member 1

interface Dialer0

ip address negotiated

encapsulation ppp

dialer pool 1

dialer idle-timeout 30

dialer string 384040

dialer-group 1

!

! Primary interface associated with physical ATM0’s interface.

! Dialer pool 2 associates it with ATM0’s dial-pool-number2.

interface Dialer2

ip address negotiated

ip mtu 1492

encapsulation ppp

dialer pool 2

dialer-group 2

!

ip classless

no cdp enable

! Primary and backup interface are given route metric. (This example uses static routes,

! thus atm0 line protocol must be brought down for backup interface to function.)

ip route 0.0.0.0 0.0.0.0 22.0.0.2

ip route 0.0.0.0 0.0.0.0 192.168.2.2 150

ip http server

!

! Specifies interesting traffic to trigger backup ISDN traffic.

dialer-list 1 protocol ip permit

Example 13-3

Configuring Dial Backup Using Dialer Watch

!

vpdn enable

!

vpdn-group 1

accept-dialin

protocol pppoe

!

! Specifies the ISDN switch type.

isdn switch-type basic-net3

!

interface Ethernet0

ip address 192.168.1.1 255.255.255.0

hold-queue 100 out

!

! ISDN interface to be used as a backup interface.

interface BRI0

no ip address

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

!

interface ATM0

no ip address

no atm ilmi-keepalive

pvc 1/40

encapsulation aal5snap

pppoe-client dial-pool-number 2

Page 127 / 196

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Chapter 13

Configuring Dial Backup and Remote Management

Configuring Dial Backup and Remote Management Through the Console or Auxiliary Port

!

dsl operating-mode auto

!

! Dial backup interface, associated with physical BRI0 interface.

! Dialer pool 1 associates it with BRI0’s dialer pool member 1.

! Note “dialer watch-group 1” associates a watch list with corresponding

! “dialer watch-list” command.

interface Dialer0

ip address negotiated

encapsulation ppp

dialer pool 1

dialer idle-timeout 30

dialer string 384040

dialer watch-group 1

dialer-group 1

!

! Primary interface associated with physical ATM0 interface.

! Dialer pool 2 associates it with ATM0’s dial-pool-number2.

interface Dialer2

ip address negotiated

ip mtu 1492

encapsulation ppp

dialer pool 2

dialer-group 2

no cdp enable

!

ip classless

!

! Primary and backup interface are given route metric.

ip route 0.0.0.0 0.0.0.0 22.0.0.2

ip route 0.0.0.0 0.0.0.0 192.168.2.2 80

ip http server

!

! Watch for interesting traffic.

dialer watch-list 1 ip 22.0.0.2 255.255.255.255

! Specifies interesting traffic to trigger backup ISDN traffic.

dialer-list 1 protocol ip permit

!

Configuring Dial Backup and Remote Management Through the

Console or Auxiliary Port

When customer premises equipment, such as a Cisco 850 or Cisco 870 series router is connected to an

ISP, an IP address is dynamically assigned to the router, or the IP address may be assigned by the router

peer through the centrally managed function. The dial backup feature can be added to provide a failover

route in case the primary line fails. Cisco 850 and Cisco 870 routers can use the auxiliary port for dial

backup and remote management.

Note

The cable modem environment is currently not supported.

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Chapter 13

Configuring Dial Backup and Remote Management

Configuring Dial Backup and Remote Management Through the Console or Auxiliary Port

Figure 13-1

shows the network configuration used for remote management access and for providing

backup to the primary WAN line.

Figure 13-1

Dial Backup and Remote Management Through the Auxiliary Port

82269

A

1

3

2

C

B

C

2

ATM

PSTN

1

Cisco 850 or Cisco 870

series router

A

Main WAN link; primary connection to Internet service provider

2

Modem

B

Dial backup; serves as a failover link for Cisco 870 routers when

primary line goes down

3

PC

C

Remote management; serves as dial-in access to allow changes or

updates to Cisco IOS configurations

Configuration Tasks

Perform these steps to configure dial backup and remote management for these routers, beginning in

global configuration mode:

Command

Purpose

Step 1

ip name-server

server-address

Example:

Router(config)#

ip name-server

192.168.28.12

Router(config)#

Enters your ISP DNS IP address.

Tip

You may add multiple server addresses if

available.

Step 2

ip dhcp pool

name

Example:

Router(config)#

ip dhcp pool 1

Router(config-dhcp)#

Creates a DHCP address pool on the router and

enters DHCP pool configuration mode. The

name

argument can be a string or an integer.

•

Configure the DHCP address pool. For

sample commands you can use in DHCP pool

configuration mode, see the

“Configuration

Example” section on page 13-13

.

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Chapter 13

Configuring Dial Backup and Remote Management

Configuring Dial Backup and Remote Management Through the Console or Auxiliary Port

Step 3

exit

Example:

Router(config-dhcp)#

exit

Router(config)#

Enters global configuration mode.

Step 4

chat-script

script-name expect-send

Example:

Router(config)#

chat-script Dialout ABORT

ERROR ABORT BUSY ““ “AT” OK “ATDT 5555102

T” TIMEOUT 45 CONNECT \c

Router(config)#

Configures a chat script used in dial-on-demand

routing (DDR) to give commands to dial a modem

and to log in to remote systems. The defined script

is used to place a call over a modem.

Step 5

interface

type

number

Example:

Router(config)#

interface Async 1

Router(config-if)#

Creates and enters configuration mode for the

asynchronous interface.

•

Configure the asynchronous interface. For

sample commands you can use in async

interface configuration mode, see the

“Configuration Example” section on

page 13-13

.

Step 6

exit

Example:

Router(config-if)#

exit

Router(config)#

Enters global configuration mode.

Step 7

interface

type

number

Example:

Router(config)#

interface Dialer 3

Router(config-if)#

Enters interface configuration mode.

Step 8

dialer watch-group

group-number

Example:

Router(config-if)#

dialer watch-group 1

Router(config-if)#

Specifies the group number for watch list.

Step 9

exit

Example:

Router(config-if)#

exit

Router(config)#

Enters global configuration mode.

Command

Purpose

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Chapter 13

Configuring Dial Backup and Remote Management

Configuring Dial Backup and Remote Management Through the Console or Auxiliary Port

Step 10

ip nat inside source

{

list

access-list-number

}

{

interface

type number |

pool

name

} [

overload

]

Example:

Router(config)#

ip nat inside source list

101

interface Dialer 3 overload

Enables dynamic translation of addresses on the

inside interface.

Step 11

ip route

prefix mask

{

ip-address

|

interface-type

interface-number

[

ip-address

]}

Example:

Router(config)#

ip route 0.0.0.0 0.0.0.0

22.0.0.2

Router(config)#

Sets the IP route to point to the dialer interface as

a default gateway.

Step 12

access-list

access-list-number

{

deny

|

permit

}

source

[

source-wildcard

]

Example:

Router(config)#

access-list 1

permit

192.168.0.0 0.0.255.255 any

Defines an extended access list that indicates

which addresses need translation.

Step 13

dialerwatch-list

group-number

{

ip

ip-address

address-mask

|

delay route-check initial

seconds

}

Example:

Router(config)#

dialer watch-list 1 ip

22.0.0.2 255.255.255.255

Router(config)#

Evaluates the status of the primary link, based on

the existence of routes to the peer. 22.0.0.2 is the

peer IP address of the ISP.

Step 14

line

[

aux

|

console

|

tty

|

vty

]

line-number

[

ending-line-number

]

Example:

Router(config)#

line console 0

Router(config-line)#

Enters configuration mode for the line interface.

Step 15

modem enable

Example:

Router(config-line)#

modem enable

Router(config-line)#

Switches the port from console to auxiliary port

function.

Step 16

exit

Example:

Router(config-line)#

exit

Router(config)#

Enters global configuration mode.

Command

Purpose

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