Avaya Configuring Dial Services Instrukcja Użytkownika Pobierz pdf (Strona 145)

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101

Dial-on-Demand Implementation Notes

308621-14.00 Rev 00

6-3

If you associate a bandwidth-on-demand pool with a hot standby circuit, the

router monitors the hot standby circuit for congestion. If the circuit becomes

congested, the router activates lines from the bandwidth-on-demand pool until

congestion is relieved.

For maximum flexibility and control when setting up alternative connections, and

for quick responses to failed primary circuits, standby circuits are the best choice.

However, for more straightforward applications, where you do not need to

configure an alternative site for the backup connection, dial backup circuits are

more suitable. Either option ensures that critical data reaches its destination.

How Standby Circuits Work

There are two types of standby circuits:

• Hot standby -- A hot standby circuit backs up a failed primary circuit. When

the primary circuit fails, the router activates the hot standby circuit to provide

another route to the destination. A hot standby circuit can connect to another

standby circuit, a demand circuit, or a demand circuit group.

Hot standby circuits can support the following types of primary circuits:

• Single leased PPP circuit

• Single leased Nortel Networks Standard circuit

• PPP multilink circuit (Site Manager configurable only)

• PPP multiline circuit (Site Manager configurable only)

• Frame relay primary circuit with a direct mode PVC

Hot standby circuits can back up primary circuits on any slot, not just the slot

on which the hot standby circuit resides. For example, if a primary line on Slot

4 fails, the router can activate a standby connection from Slot 3.

• Standby -- A standby circuit has no relationship with the primary circuit. It

does not back up a primary circuit if that circuit fails. Instead, a standby

circuit answers incoming calls destined for it. A standby circuit can also carry

data when you activate it manually.

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