Cisco Systems Router 1800 Series User Manual
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Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Chapter 13 Configuring Dial Backup and Remote Management
Dial Backup Feature Limitations
Dial Backup Feature Limitations
The following limitation exists for the dial backup feature: bridging is not supported over console or
auxiliary port backup interfaces.
Ta b l e 13-1 summarizes dial backup support and limitations for the Cisco 1800 series integrated services
fixed-configuration routers.
Step 5ip route prefix mask {ip-address | interface-type
interface-number [ip-address]} [distance]
Example:
Router(config)# ip route 0.0.0.0 0.0.0.0
192.168.2.2 150
Router(config)#
Assigns the lower routing administrative distance
value for the backup interface route. 192.168.2.2
is the peer IP address of the backup interface.
Step 6dialerwatch-list group-number {ip ip-address
address-mask | delay route-check initial
seconds}
Example:
Router(config)# dialer watch-list 2 ip
22.0.0.2 255.255.255.255
Router(config)#
Assigns an IP address to the watch list.
If the connection on the primary interface is lost
and the IP address is unavailable on the router, the
dial-out feature on the backup interface is
triggered. 22.0.0.2 is the peer IP address of the
primary interface.
Command Purpose
Ta b l e 13-1 Dial Backup Feature Support and Limitations Summary
WAN Encapsulation
Ty p eDial Backup
Possible?
Dial Backup MethodLimitations
Cisco 1811 or Cisco 1812
PPPoEYe sDialer watchBridging is not supported across a slow interface, for
example, an auxiliary port. The peer IP address of the ISP is
needed to configure the dialerwatch command and the IP
static route.
Normal IP in cable
modem scenarioNoDialer watchThe IP addresses of the peers are needed for dialer watch to
work properly. If a lease time obtained by DHCP is not set
short enough (1 or 2 minutes), dial backup is not supported.
13-6 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 13 Configuring Dial Backup and Remote Management Dial Backup Feature Limitations Configuration Example The following three examples show sample configurations for the three dial backup methods. Example 13-1 Configuring Dial Backup Using Backup Interfaces ! vpdn enable! vpdn-group 1 accept-dialinprotocol pppoe ! !Specifies the ISDN switch typeisdn switch-type basic-net3 ! interface vlan 1ip 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 addressencapsulation ppp dialer pool-member 1 isdn switch-type basic-net3! interface ATM0 backup interface BRI0no ip address no atm ilmi-keepalive pvc 1/40encapsulation aal5snap pppoe-client dial-pool-number 2 Cisco 1801, Cisco 1802, or Cisco 1803 PPP over ATM PPP over Ethernet Ye sBackup interfaces Floating static routes Dialer watch Floating static route and dialer watch need a routing protocol to run in the router. The dialer watch method brings up the backup interface as soon as the primary link goes down. The backup interface is brought down as soon as the dialer timeout is reached and the primary interface is up. The router checks the primary interface only when the dialer timeout expires. The backup interface remains up until the dialer timeout is reached, even though the primary interface is up. For the dialer watch method, a routing protocol does not need to be running in the router, if the IP address of the peer is known. RFC 1483 (AAL5, SNAP, and MUX)Ye sBackup interfaces Floating static routes Dialer watch If bridging is done through the WAN interface, it is not supported across the auxiliary port. Table 13-1 Dial Backup Feature Support and Limitations Summary (continued) WAN Encapsulation Ty p eDial Backup Possible? Dial Backup Method Limitations
13-7 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 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 negotiatedencapsulation ppp dialer pool 1 dialer idle-timeout 30dialer 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 Dialer2ip address negotiated ip mtu 1492 encapsulation pppdialer pool 2 dialer-group 2 no cdp enable! ip classless !Primary and backup interface given route metric ip route 0.0.0.0 0.0.0.0 22.0.0.2ip route 0.0.0.0 0.0.0.0 192.168.2.2 80 ip http server !!Specifies interesting traffic to trigger backup ISDN traffic dialer-list 1 protocol ip permit Example 13-2 Configuring Dial Backup Using Floating Static Routes ! vpdn enable !vpdn-group 1 accept-dialin protocol pppoe! !Specifies the ISDN switch type isdn switch-type basic-net3! interface vlan 1 ip address 192.168.1.1 255.255.255.0hold-queue 100 out ! !ISDN interface to be used as a backup interfaceinterface BRI0 no ip address encapsulation pppdialer pool-member 1 isdn switch-type basic-net3 !interface ATM0 no ip address no atm ilmi-keepalivepvc 1/40 encapsulation aal5snap pppoe-client dial-pool-number 2!
13-8 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 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 pppdialer pool 1 dialer idle-timeout 30 dialer string 384040dialer-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 negotiatedip mtu 1492 encapsulation ppp dialer pool 2dialer-group 2 ! ip classlessno cdp enable !Primary and backup interface given route metric (This example using 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 22.0.0.2ip 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 192.168.1.1 255.255.255.0hold-queue 100 out ! !ISDN interface to be used as a backup interfaceinterface BRI0 no ip address encapsulation pppdialer pool-member 1 isdn switch-type basic-net3 !interface ATM0 no ip address no atm ilmi-keepalivepvc 1/40 encapsulation aal5snap pppoe-client dial-pool-number 2!
13-9 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 13 Configuring Dial Backup and Remote Management Configuring Dial Backup and Remote Management Through the ISDN S/T 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 negotiatedencapsulation ppp dialer pool 1 dialer idle-timeout 30dialer 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 1492encapsulation ppp dialer pool 2 dialer-group 2no cdp enable ! ip classless !Primary and backup interface 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 80ip http server ! !Watch for interesting trafficdialer watch-list 1 ip 22.0.0.2 255.255.255.255 !Specifies interesting traffic to trigger backup ISDN trafficdialer-list 1 protocol ip permit ! Configuring Dial Backup and Remote Management Through the ISDN S/T Port The Cisco 1812, Cisco 1801, Cisco 1802, and Cisco 1803 routers use the ISDN S/T port for dial backup and remote management. Perform the following tasks to configure dial backup and remote management through the ISDN S/T port of your router: Configure ISDN Settings Configure the Aggregator and ISDN Peer Router Configure ISDN Settings NoteTraffic of interest must be present to activate the backup ISDN line by means of the backup interface and floating static routes methods. Traffic of interest is not needed for the dialer watch to activate the backup ISDN line.
13-10 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 13 Configuring Dial Backup and Remote Management Configuring Dial Backup and Remote Management Through the ISDN S/T Port Perform these steps to configure your router ISDN interface for use as a backup interface, beginning in global configuration mode: CommandPurpose Step 1isdn switch-type switch-type Example: Router(config)# isdn switch-type basic-net3 Router(config)# Specifies the ISDN switch type. The example specifies a switch type used in Australia, Europe, and the United Kingdom. For details on other switch types supported, see the Cisco IOS Dial Technologies Command Reference. Step 2interface type number Example: Router(config)# interface bri 0 Router(config-if)# Enters configuration mode for the ISDN Basic Rate Interface (BRI). Step 3encapsulation encapsulation-type Example: Router(config-if)# encapsulation ppp Router(config-if)# Sets the BRI0 interface encapsulation type. Step 4dialer pool-member number Example: Router(config-if)# dialer pool-member 1 Router(config-if)# Specifies the dialer pool membership. Step 5isdn switch-type switch-type Example: Router(config-if)# isdn switch-type basic-net3 Router(config-if)# Specifies the ISDN switch type. Step 6exit Example: Router(config-if)# exitRouter(config)# Enters global configuration mode. Step 7interface dialer dialer-rotary-group-number Example: Router(config)# interface dialer 0 Router(config-if)# Creates a dialer interface (numbered 0–255) and enters into interface configuration mode.
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Chapter 13 Configuring Dial Backup and Remote Management
Configuring Dial Backup and Remote Management Through the ISDN S/T Port
Step 8ip address negotiated
Example:
Router(config-if)# ip address negotiatedRouter(config-if)#
Specifies that the IP address for the interface is
obtained through PPP/IPCP (IP Control Protocol)
address negotiation. The IP address is obtained
from the peer.
Step 9encapsulation encapsulation-type
Example:
Router(config-if)# encapsulation ppp
Router(config-if)#
Sets the encapsulation type to PPP for the
interface.
Step 10dialer pool number
Example:
Router(config-if)# dialer pool 1
Router(config-if)#
Specifies the dialer pool to be used.
In the example, the dialer pool 1 setting associates
the dialer 0 interface with the BRI0 interface
because the BRI0 dialer pool-member value is 1.
Step 11dialer string dial-string[:isdn-subaddress]
Example:
Router(config-if)# dialer string 384040
Router(config-if)#
Specifies the telephone number to be dialed.
Step 12dialer-group group-number
Example:
Router(config-if)# dialer group 1
Router(config-if)#
Assigns the dialer interface to a dialer group
(1–10).
Step 13exit
Example:
Router(config-if)# exitRouter(config)#
Exits the dialer 0 interface configuration mode,
and enters global configuration mode.
Step 14dialer-list dialer-group protocol protocol-name
{permit | deny | list access-list-number |
access-group}
Example:
Router(config)# dialer-list 1 protocol ip
permit
Router(config)#
Creates a dialer list for packets of interest to be
forwarded through the specified interface dialer
group.
In the example, dialer-list 1 corresponds to
dialer-group 1.
For details about this command and additional
parameters that can be set, see the
Cisco IOS Dial
Technologies Command Reference.
Command Purpose
13-12 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 13 Configuring Dial Backup and Remote Management Configuring Dial Backup and Remote Management Through the ISDN S/T Port Configure the Aggregator and ISDN Peer Router The aggregator is typically a concentrator router where your Cisco router ATM PVC terminates. In the configuration example shown below, the aggregator is configured as a PPPoE server to correspond with the Cisco 876 router configuration example that is given in this chapter. The ISDN peer router is any router that has an ISDN interface and can communicate through a public ISDN network to reach your Cisco router ISDN interface. The ISDN peer router provides Internet access for your Cisco router during the ATM network downtime. !This portion of the example configures the aggregatorvpdn enable no vpdn logging !vpdn-group 1 accept-dialin protocol pppoevirtual-template 1 ! interface Ethernet3description “4700ref-1” ip address 40.1.1.1 255.255.255.0 media-type 10BaseT! interface Ethernet4 ip address 30.1.1.1 255.255.255.0 media-type 10BaseT! interface Virtual-Template1 ip address 22.0.0.2 255.255.255.0ip mtu 1492 peer default ip address pool adsl !interface ATM0 no ip address pvc 1/40encapsulation aal5snap protocol pppoe !no atm limi-keepalive ! ip local pool adsl 22.0.0.1ip classless ip route 0.0.0.0 0.0.0.0 22.0.0.1 50 ip route 0.0.0.0 0.0.0.0 30.1.1.2.80 !This portion of the example configures the ISDN peer isdn switch-type basic-net3! interface Ethernet0 ip address 30.1.1.2 255.0.0.0 ! interface BRI0 description “to 836-dialbackup”no ip address encapsulation ppp dialer pool-member 1isdn switch-type basic-net3 ! interface Dialer0ip address 192.168.2.2 255.255.255.0 encapsulation ppp dialer pool 1
13-13 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 13 Configuring Dial Backup and Remote Management Configuring Dial Backup and Remote Management Through a V.92 Modem dialer string 384020dialer-group 1 peer default ip address pool isdn !ip local pool isdn 192.168.2.1 ip http server ip classlessip route 0.0.0.0 0.0.0.0 192.168.2.1 ip route 40.0.0.0 255.0.0.0 30.1.1.1 !dialer-list 1 protocol ip permit ! Configuring Dial Backup and Remote Management Through a V.92 Modem Perform the following tasks to configure dial backup and remote management through the V.92 modem on your Cisco 1811 router: Asynchronous Interface Configuration Line Configuration Asynchronous Interface Configuration Perform these steps to configure the V.92 modem for use as a backup interface, beginning in global configuration mode: Command Purpose Step 1interface type number Example: Router(config)# interface async 1Router(config-if)# Enters interface configuration mode for the asynchronous serial interface. Enter the number of the interface you want to configure. Step 2ip unnumbered type number Example: Router(config-if)# ip unnumbered FastEthernet 2 Router(config-if)# Conserves IP addresses by configuring the asynchronous interface as unnumbered, and assigns the IP address of the interface type that you want to leverage. Step 3encapsulation encapsulation-type Example: Router(config-if)# encapsulation ppp Router(config-if)# Sets the encapsulation type to PPP for the interface.
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Chapter 13 Configuring Dial Backup and Remote Management
Configuring Dial Backup and Remote Management Through a V.92 Modem
Step 4dialer in-band
Example:
Router(config-if)# dialer in-bandRouter(config-if)#
Specifies support for dial-on-demand routing
(DDR) and chat scripts on this asynchronous
interface.
Step 5dialer string dial-string
Example:
Router(config-if)# dialer string
T14085551234
Router(config-if)#
Specifies the telephone number to be dialed.
Step 6dialer-group group-number
Example:
Router(config-if)# dialer group 1
Router(config-if)#
Assigns the dialer interface to a dialer group
(1–10), controlling access. The number to which
the dialer access group belongs is defined with the
dialer-list command.
Step 7async mode interactive
Example:
Router(config-if)# async mode interactive
Router(config-if)#
Returns a line that has been placed into dedicated
asynchronous network mode to interactive mode,
thereby enabling the Serial Line Internet Protocol
(SLIP) and PPP EXEC commands.
Step 8peer default ip address {ip-address | pool
[pool-name]}
Example:
Router(config-if)# peer default ip address
pool pool123
Router(config-if)#
Assigns IP addresses to remote clients, using an
address pool. To create an IP address pool, use the
ip local pool global configuration command.
Step 9exit
Example:
Router(config-if)# exit
Router(config)#
Exits asynchronous interface configuration, and
enters global configuration mode.
Command Purpose