Dial Backup for Serial Lines Commands

This chapter describes the function and displays the syntax for commands used to configure a primary serial interface to use a specific dial backup interface. For more information about defaults and usage guidelines, see the corresponding chapter of the Dial Solutions Command Reference.

backup delay

To define how much time should elapse before a secondary line status changes after a primary line status has changed, use the backup delay interface configuration command. To return to the default, so that as soon as the primary fails, the secondary is immediately brought up without delay, use the no form of this command.

backup delay {enable-delay | never} {disable-delay | never}
no backup delay {enable-delay | never} {disable-delay | never}

enable-delay	Number of seconds that elapse after the primary line goes down before the Cisco IOS software activates the secondary line.
disable-delay	Number of seconds that elapse after the primary line comes up before the Cisco IOS software deactivates the secondary line.
never	Prevents the secondary line from being activated or deactivated.

backup interface

To configure an interface as a secondary or dial backup, use the backup interface interface configuration command. To disable this feature, use the no form of this command.

backup interface type number
no backup interface type number

backup interface slot/port (for the Cisco 7200 series and Cisco 7500 series)
no backup interface slot/port

type number	Interface type and port number to use as the backup interface.
slot/port	Backplane slot number and port number on the interface. See your hardware installation manual for the specific slot and port numbers.
slot/port	Backplane slot number and port number on the interface. See your hardware installation manual for the specific slot and port numbers.

backup load

To set a traffic load threshold for dial backup service, use the backup load interface configuration command. To return to the default value, use the no form of this command.

backup load {enable-threshold | never} {disable-load | never}
no backup load {enable-threshold | never} {disable-load | never}

enable-threshold	Percentage of the primary line's available bandwidth that the traffic load must exceed to enable dial backup.
disable-load	Percentage of the primary line's available bandwidth that the traffic load must be less than to disable dial backup.
never	Sets the secondary line never to be activated due to traffic load.