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Dial-on-Demand Implementation Notes
114062 Rev. B 5-5
If you want to use unnumbered interfaces, configure them on the outgoing hot
standby circuit, and configure unnumbered demand circuit groups on the
incoming standby circuit.
To configure standby circuits, refer to Chapter 9.
Balancing Traffic between a Primary Circuit and a Hot Standby Circuit
Once a hot standby circuit is active, the routing protocol activates and finds an
alternative route to the destination. When the primary circuit recovers and resumes
data transmission, the routing protocol deactivates. This is referred to as a failback
to the primary circuit.
You can control the failback to the primary circuit manually or automatically. One
advantage of controlling failback is that you can delay the return of traffic to the
primary circuit. This lets the primary circuit stabilize before it resumes
transmission of critical data.
The following configuration choices enable you to manage traffic between the
primary circuit and the hot standby circuit:
RIP or OSPF precedence and cost parameters
The router sends traffic across the circuit with the better cost route. If the
better route is the hot standby circuit, traffic continues across this circuit even
if the primary circuit recovers. Conversely, traffic will resume across the
primary circuit if that is the better route. Refer to Configuring IP Services for
information about RIP and OSPF.
Standby Failback Mode parameter
This parameter specifies the method that the router uses to deactivate the
standby circuit and return to the primary circuit. Using this parameter, you
can control the failback to the primary circuit automatically or manually.
Failback Time parameter
This parameter specifies the delay before returning to the recovered primary
circuit. The routing-level configuration takes precedence over the value of this
parameter. If the primary circuit has a better cost route, traffic returns to the
primary circuit, regardless of the delay specified by this parameter. If the hot
standby circuit has a better cost route, the router uses this circuit until the
failback timer expires.
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