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8.1

Dial Backup
 


 

8.1.3


Activating a dial backup to
support primary line traffic
 







A backup interface can be configured to
activate the secondary link based on the traffic load on the primary
link. The IOS monitors the traffic load and computes the percentage of
utilization on the link. This calculation is based on a five-minute
average, and it is computed every 5 seconds. If this average exceeds
the value set for the line, 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 a backup for when the
primary line reaches or exceeds a certain threshold, perform the
following steps on one side of the connection only:



Select the primary interface:
Router(config)#interface
interface-type slot/port

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 slot/port
or
Router(config-if)#backup interface
dialer number


To set the traffic load threshold
for dial backup service, use the following command syntax:

Router(config-if)#backup load
{enable-threshold | never} {disable-load | never}


The secondary line is brought down when
one of the following conditions occur:

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 on Frame Relay subinterfaces.


















 



Web Links

Configuring Dial Backup for Serial Lines



http://www.cisco.com/univercd/cc/td/doc/ product/software/
ios113ed/113ed_cr/dial_c/ dcprt5/dcdbaks.htm










 








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