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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring Backup Data Lines and Remote Management
Configuring Dial Backup and Remote Management Through the Console Port or Auxiliary Port
Configuring Dial Backup and Remote Management Through the
Console Port or Auxiliary Port
When customer premises equipment, such as a Cisco 3900 series ISR, is connected to an ISP, an IP
address is dynamically assigned to the router, or the IP address is 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 3900 series ISRs can use the auxiliary port for dial backup and remote
management.
Figure 1 shows the network configuration used for remote management access and for providing backup
to the primary WAN line.
Figure 1 Dial Backup and Remote Management Through the Auxiliary Port
1 Cisco 3900 series
router
A Main WAN link; primary connection to Internet service provider
2 Modem B Dial backup; serves as a failover link for Cisco 3900 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
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A1
3
2
2
C
B
BC
2
Internet
PSTN
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