13-6
Cisco1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Chapter13 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.
Example13-1 Configuring Dial Backup Using Backup Interfaces
!
vpdn enable
!
vpdn-group 1
accept-dialin
protocol pppoe
!
!Specifies the ISDN switch type
isdn switch-type basic-net3
!
interface vlan 1
ip address 192.168.1.1 255.255.255.0
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
backup interface BRI0
no ip address
no atm ilmi-keepalive
pvc 1/40
encapsulation aal5snap
pppoe-client dial-pool-number 2
Cisco1801, Cisco 1802, or Cisco 1803
PPP over ATM
PPP over Ethernet
Yes Backup 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)
Yes Backup interfaces
Floating static routes
Dialer watch
If bridging is done through the WAN interface, it is not
supported across the auxiliary port.
Table13-1 Dial Backup Feature Support and Limitations Summary (continued)
WAN Encapsulation
Type
Dial Backup
Possible? Dial Backup Method Limitations