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Prestige 100 and 100IH ISDN Router and Router/Hub
4-6 Remote Node Configuration
4.1.3 PPP Multilink
The Prestige uses the PPP Multilink Protocol (PPP/MP) to bundle multiple links in a single
connection to boost the effective throughput between two nodes.
Due to the fragmentation/reconstruction overhead associated with MP, you may not get a linear
increase in throughput when a link is added.
The number of links in an MP bundle can be statically configured, or dynamically determined at
runtime, as explained in the following section.
4.1.4 Bandwidth on Demand
The Bandwidth on Demand (BOD) feature adds or subtracts links dynamically according to
traffic demand. After the initial call, the Prestige uses BAP (Bandwidth Allocation Protocol) to
ask the peer for additional telephone number if BACP (Bandwidth Allocation Control Protocol) is
negotiated. Otherwise, the Prestige uses the statically configured (primary and secondary)
telephone numbers of the remote node.
The configuration of bandwidth on demand focuses on the Base Transmission Rate (BTR) and the
Maximum Transmission Rate (MTR). The relationship between BTR and MTR are shown below:
Table 4-2 BTR v MTR for BOD
BTR & MTR Setting No. of
channel(s)
used
Max No. of
channel(s)
used
Bandwidth
on demand
BTR = 64, MTR = 64 1 1 Off
BTR = 64, MTR = 128 1 2 On
BTR = 128, MTR = 128 2 2 Off
When bandwidth on demand is enabled, a second channel will be brought up if traffic on the
initial channel is higher than the high Target Utility number for longer than the specified Add
Persist value. Similarly, the second channel will be dropped if the traffic level falls below the low
Target Utility number for longer than the Subtract Persist value.
The Target Utility specifies the line utilization range at which you want the Prestige to add or
subtract bandwidth. The range is 30 to 64 Kbps (kilobits per second). The parameters are
separated by a ‘-’. For example, ‘30-60’ means the add threshold is 30 Kbps and subtract
threshold is 60 Kbps. The Prestige performs bandwidth on demand only if it initiates the call.