
Dial Services Overview
1-15
Example Bandwidth-on-Demand Application
In Figure 1-8, the primary line is congested due to bridge/routing protocol traffic.
The BLN in Rome, designated as the congestion monitor, has determined the line
is congested based on the bandwidth-on-demand monitor parameter values.
Consequently, the router brings up an ISDN B channel as a secondary line.
Figure 1-8. Sample Bandwidth-on-Demand Network
The congestion monitor brings down the secondary line once the level of
congestion falls below the configured percentages.
In addition to serving as a secondary line for the leased line to Avignon, the B
channel can also act as a backup line for the leased line from Rome to Florence
and 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
64 Kb/s Leased Line to Florence
Dialup Line to Interlaken
Secondary ISDN B-Channel
Primary 9.6Kb/s Leased Line
ISDN
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