
Configuring Dial Services
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Defining the Role of the Router in the Network
Leased bandwidth circuits are point-to-point connections. For each circuit, you
must designate a router at one end of the connection as the congestion monitor.
The congestion monitor checks the congestion of the lines in a multilink bundle. If
this router discovers congestion, it activates secondary lines. The router at the
other end of the connection, the nonmonitor router, does not have the authority to
activate a secondary line. It is important to define the role of each router on the
link to avoid both routers bringing up a second line simultaneously.
You define the role of the router via the Bandwidth Mode parameter, which is part
of the bandwidth circuit configuration (see Chapter 8). Do not configure both
sides of the circuit as the congestion monitor.
Balancing Traffic between Lines in a Multilink Bundle
With multilink enabled for bandwidth-on-demand, the router sending data divides
the outbound traffic among all the lines in the bundle. The configured external
clock speed of each line determines the proportion of the total traffic each
receives. On the receiving end, multilink resequences packets arriving on different
links using the sequence number from the multilink header.
For more information about traffic distribution, see Configuring PPP Services.
Ensuring Accuracy of the Congestion Thresholds
The router uses several congestion threshold parameters to measure congestion on
the bandwidth circuit. The value of these parameters determines when the router
activates additional lines to relieve congestion.
If you want to configure the clock speed of your leased line to any value other than
the default, 64 Kb/s, this affects how the router calculates the congestion
thresholds. To ensure the router’s calculations are accurate, you must modify the
clock speed via the synchronous line parameter External Clock Speed. Once you
configure this parameter to the actual speed of the line, you ensure that the
congestion thresholds will be correct.
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