To set a traffic load threshold for dial backup service, use the backup load command in interface configuration mode. 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}

Syntax Description

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 available bandwidth that the traffic load must be less than to disable dial backup. The transmitted or received load on the primary line plus the transmitted or received load on the secondary line is less than the value entered for the disable-load argument to disable dial backup.
never The secondary line is never activated or deactivated because of the traffic load.

Command Default

No threshold is defined.

Command Modes

Interface configuration

Command History

Release Modification
10.0 This command was introduced.
12.2(33)SRB1 This command was integrated into Cisco IOS Release 12.2(33)SRB1.

Usage Guidelines

When the transmitted or received load on the primary line is greater than the value assigned to the enable-threshold argument, the secondary line is enabled.

The secondary line is disabled when one of the following conditions occurs:

•The transmitted load on the primary line plus the transmitted load on the secondary line is less than the value entered for the disable-load argument.

•The received load on the primary line plus the received load on the secondary line is less than the value entered for the disable-load argument.

If the never keyword is used instead of an enable-threshold argument, the secondary line is never activated because of traffic load. If the never keyword is used instead of a disable-load argument, the secondary line is never activated because of traffic load.

Examples

The following example sets the traffic load threshold to 60 percent of the primary line serial 0. When that load is exceeded, the secondary line is activated and will not be deactivated until the combined load is less than 5 percent of the primary bandwidth.

interface serial 0
 backup load 60 5
 backup interface serial 1

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