Avaya Configuring Dial Services Bedienungsanleitung PDF herunterladen (Seite 147)

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Dial-on-Demand Implementation Notes

308621-14.00 Rev 00

6-5

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. See Configuring IP, ARP, RARP, RIP,

and OSPF 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.

Callback

Callback is a dial-on-demand feature for use between two peer routers, such as a

central router and a remote router, over a PPP circuit. You cannot use callback

with frame relay demand circuits or demand circuit groups.

With this feature, you can configure a router to call back an incoming caller. You

can configure callback across any demand circuit, including those configured for

bandwidth-on-demand service.

Callback offers the following advantages:

• Reduces tariffs because you can place calls using the lowest-cost path

• Secures access for authorized callers only

• Consolidates accounting of phone charges

Figure 6-1

shows how callback works.

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