Specifications

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Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA
Configuring Backup Data Lines and Remote
Management
Cisco 3900 series, 2900 series, and 1900 series integrated services routers (ISRs) support remote
management and backup data connectivity by means of ISDN.
The following sections describe how to configure backup data lines and remote management:
• Configuring Backup Interfaces, page 1
• Configuring Dial Backup and Remote Management Through the Console Port or Auxiliary Port,
page 13
• Configuring Data Line Backup and Remote Management Through the ISDN S/T Port, page 20
Configuring Backup Interfaces
This section contains the following topics:
• Configuring the Backup Interface, page 1
• Configuring Gigabit Ethernet Failover Media, page 3
• Configuring Cellular Dial-on-Demand Routing Backup, page 5
Configuring the Backup Interface
When the router receives an indication that the primary interface is down, the backup interface is
enabled. After the primary connection is restored for a specified period, the backup interface is disabled.
Note For dial-on-demand routing (DDR) backup, even if the backup interface comes out of standby mode, the
router does not enable the backup interface unless the router receives the traffic specified for that backup
interface.
To configure the router with a backup interface, follow these steps, beginning in global configuration
mode.