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Configuring Dial Services

6-6

117353-B Rev. 00

Using Schedules to Manage Standby Circuit Availability

Part of the standby circuit configuration is to schedule the circuit’s availability.

The Time of Day schedule defines the interval that the standby circuit is available.

It also determines how the router uses the primary and standby circuits when they

are both active.

You may configure several Time of Day schedules for a circuit in a 24-hour

period. If you do not set up a schedule for the circuit, the circuit’s availability

defaults to 24 hours a day.

The Failback Time parameter is part of the Time of Day schedule. Depending on

how you set this parameter, there may be a delay between the time the standby

circuit is disconnected and the time traffic returns to the primary circuit.

Therefore, it is important to balance the use of the primary and standby circuits to

ensure that data reaches the remote destination.

Be aware that the router monitors the primary circuit during the failback time. If

the primary circuit fails, the router continues to use the standby circuit.

To configure a circuit’s schedule, see “Scheduling When the Demand Circuit Is

Available” on page 10-9.

Configuring Multiple Time of Day Schedules

Configuring multiple Time of Day schedules for a circuit can cause schedule

conflicts. This section provides two examples of when this happens.

If the failback time for the active Time of Day schedule overlaps the failback time

of the next schedule, the router uses the failback time of the latter schedule. The

router deducts the amount of failback time already elapsed from the latter

schedule (see “Example 1: Failback Times That Overlap

”).

Table 6-1

shows the Time of Day schedule for Standby Circuit 1.

Table 6-1. Time of Day Schedules for Standby Circuit 1

Time of Day Schedule 1 Time of Day Schedule 2 Time of Day Schedule 3

Start Time: 8 a.m.

End Time: 11 a.m.

Start Time: 11 a.m.

End Time: 5 p.m.

Start Time: 7 p.m.

End Time: 11 p.m.

Failback Time: 60 minutes Failback Time: 10 minutes Failback Time: 10 minutes

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Avaya Configuring Dial Services Manual do Utilizador Página 140