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Dial Services Overview
114062 Rev. B 2-25
Terminating Secondary Lines
The router terminates secondary lines when
The leased line or multilink bundle fails.
The leased circuit is no longer congested.
The remote router terminates the connection.
There is a physical problem with the dial-up line.
Sample Bandwidth-on-Demand Application
In Figure 2-11, the leased line is congested due to bridge/routing protocol traffic.
The BLN in Rome, designated as the monitor router, has determined the line is
congested based on the monitor parameter values. Consequently, the router brings
up an ISDN B channel as a secondary line.
Figure 2-11. Sample Bandwidth-on-Demand Network
The monitor router brings down the secondary line once the level of congestion
falls below the configured percentages. In addition to supporting the leased line to
Avignon, the B channel can also act as a backup line for the leased line from
Rome to Florence and as a demand line from Rome to Interlaken.
AN
Slot 3
octal sync
Slot 2
dual sync
dual ethernet
TA
Rome
Backbone link node
Avignon
access node
Dial-up line
to Interlaken
Secondary dial-up line
(ISDN B channel)
Leased line (9.6 Kb/s)
ISDN
DS0001A
64 Kb/s leased line to Florence
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