Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 146)

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101

Configuring Dial Services

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308621-14.00 Rev 00

The router activates a standby circuit when:

• A primary circuit fails.

The router activates a hot standby circuit when the primary circuit fails. The

hot standby takes over data transmission. To determine whether a primary

circuit failed, the router relies on Breath of Life (BofL) messages for PPP

primary circuits and A-bit notification for frame relay primary circuits.

When you associate a PPP primary circuit with a hot standby circuit, the

router automatically enables BofL for the primary circuit, so be sure to enable

BofL on the other side of the PPP primary circuit. This does not apply to

frame relay primary circuits.

• A call is designated for the standby circuit.

The router activates a standby circuit only when the remote router calls the

host router over a standby circuit.

• You activate a standby circuit manually.

Typically, circuits at the remote site will be hot standby circuits, while at the

central site, they will be regular standby circuits. Configuring hot standby circuits

for the remote router means that the remote router monitors the status of its

primary connections, which is easier for the remote router than for the central

router because there are fewer connections.

Standby circuits support standard demand circuit features such as multilink,

unnumbered interfaces, dial-optimized routing, and outbound filtering.

Balancing Traffic Between a Primary Circuit and a Hot Standby Circuit

When 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.

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