Avaya Configuring Dial Services Manual do Utilizador descarregar pdf (Página 48)

Configuring Dial Services

1-20

117353-B Rev. 00

Configuration of the Backup Circuit

The configuration of the backup circuit depends on the protocol for the primary

circuit. If Standard or PPP is running over the primary circuit, the backup circuit

inherits the primary’s network layer address configuration. Unlike the network

layer address configuration, the data link layer configuration can be unique.

If frame relay is running over the primary circuit, the backup circuit can inherit the

primary’s configuration or it can use its own configuration. When the frame relay

primary and backup circuit use the same configuration, it is called the shared

configuration. The shared configuration allows a backup circuit to use the same

network layer address as the primary circuit. The backup circuit’s data link layer

configuration (PVCs, DLCIs, and filters) can be the same or different from the

primary circuit.

If the backup circuit uses a unique configuration, it is called the secondary

configuration. A secondary configuration uses a different network layer address,

and data link layer configuration (PVCs and filters) from the primary circuit.

Activating the Backup Line

When the router detects a failure on the primary line, it selects a line from a

backup pool. The router activates a backup line when:

• The primary circuit is not operating.

• All of the primary circuit’s lines have failed.

• An active backup line has failed.

If the backup line itself fails, an inactive backup line can replace it only if you

configure multiple lines in the backup pool. If the first line fails for every

phone number in the router’s phone list, and the primary line is still down, the

router tries the next line in the pool.

If you are backing up a frame relay primary circuit, the router (not the

network) activates and terminates the frame relay backup connection. The

router rejects incoming calls from the frame relay network.

Note:

If the backup circuit connects to a different interface at the destination

than the primary circuit, you do not need to configure unique PVCs for the

backup circuit. In this case, the switch informs the destination router of the

available PVCs.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 481 482

Sem comentários

Avaya Configuring Dial Services Manual do Utilizador Página 48