Avaya Configuring Dial Services Bedienungsanleitung Seite 38

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Configuring Dial Services
1-12
Terminating the Backup Line
The router terminates the backup line when it can restore the primary line, the
backup line fails, or the configured time period for the backup line is over. Once
the router restores the primary circuit, it checks to make sure that the backup
circuit is no longer active. If the backup is still active, the router terminates it.
Bandwidth-on-Demand Service
When data traffic exceeds a primary line’s capacity, bandwidth-on-demand
service alleviates congestion over the primary line by adding up to three
secondary lines. The router can then provide a total of four lines for
communication.
Initially, the router brings up one secondary line to alleviate congestion on the
primary line. If congestion persists, the router brings up a second and then a third
line until the congestion ends. As each new line comes up, it becomes part of a
bundle or group of lines. The router then balances traffic over the bundle. Once the
volume of traffic decreases, the router brings down the secondary lines, one at a
time.
A router at one side of the link monitors byte counts for data it sends and receives.
This router is called the congestion monitor. The congestion monitor uses these
byte counts, along with bandwidth-on-demand monitor parameters, to determine
when to activate another line for more bandwidth. The router then uses all the
available lines in the bundle to send data across the network.
Bandwidth-on-demand is supported on synchronous lines (RS232, V.35, RS422,
and X.21) and on ISDN BRI and PRI interfaces.
Configure the bandwidth primary and secondary lines as follows:
Primary — Any leased line up to 64 Kb/s.
Protocol supported: Point-to-Point (PPP) multilink.
Secondary — Any available synchronous line, or ISDN B channel.
Protocol supported: Point-to-Point (PPP) multilink.
The primary and secondary lines may operate at different speeds.
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