You can configure a backup to
activate the secondary line based on the traffic load on the
primary line. The software monitors the traffic load and computes a
five-minute moving average. If this average exceeds the value you
set for the line (as shown in Figure
), the secondary line is
activated. Depending on how the line is configured, some or all of
the traffic will flow onto the secondary dialup line.
To configure backup if a primary line
reaches or exceeds a certain threshold, perform the following steps:
- Select the primary interface and
configure it as needed (for DDR, Frame Relay
interfaces, X.25, and so on):
Router(config)#interface
serial 0
- Use the
following command on the primary interface to specify the backup
to be used if a dial backup is needed:
Router(config-if)#backup
interface interface-type number
- To set the traffic load
threshold for dial backup service, use the following command
syntax, which is explained in Table
:
Router(config-if)#backup
load {enable-threshold | never} {disable-threshold
| never}
- 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.
The backup load command cannot
be configured for Frame Relay subinterfaces.
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