
Configuring Dial Services
1-8
Terminating Demand Circuits
The router brings down the circuit under one of the following conditions:
• The configured inactivity time expires
To bring down the connection, you can configure the Inactivity Time
parameter, which dynamically brings down the connection after a specified
amount of time elapses without data activity.
• You enable a force take down
To bring down a force dial connection, you configure the Force Take Down
parameter, which instructs the router to bring down the connection. To learn
how to configure this parameter, refer to Chapter 5.
• You schedule the circuit to come down
Using the Schedule option, you can schedule the circuit’s availability for a
specific day and time. The schedule parameters are part of the circuit’s
configuration (refer to Chapter 5). The Schedule option also allows you to
configure whether the router uses the Inactivity Time parameter to
dynamically bring down the connection.
Dial Backup Service
Dial backup service allows you to configure a backup line for a primary line that
fails. A primary line is a leased line between two routers. This line is the physical
connection over which the primary circuit, the logical connection, carries traffic.
If a primary line fails and you configure dial backup service for that line, the
router activates an available backup line for the circuit. When the primary line is
restored, the router reroutes all traffic from the backup line to the primary line and
clears the dial backup connection.
The router “knows” that a primary line has failed when it stops receiving packets
within the Breath of Life (BOFL) time period. You configure the BOFL timer with
the synchronous line parameter BOFL Timeout. (See Configuring Routers or
Configuring Customer Access and Trunks (BNX Software) for more information.)
Dial backup is supported on synchronous lines (RS232, V.35, RS422, and X.21)
and on ISDN interfaces.
Comentarios a estos manuales