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BOD High Threshold (%) – (0 to 100) The throughput value as a percentage of
total bandwidth which will cause the next ISDN port having Multi-Link PPP
enabled to dial up and add bandwidth to the connection. This value, however,
must be constantly exceeded for the time designated in the Add Bandwidth Delay
field before the next ISDN port dials out.
BOD Low Threshold (%) – (0 to 100) The throughput value as a percentage of
total bandwidth which will cause the highest numbered ISDN port in the MLPPP
bundle to hang up, thus subtracting bandwidth from the connection. Before
actually hanging up however, the throughput must be below this value for the
time designated in the Subtract Bandwidth Delay field.
Add Bandwidth Delay (sec) – (0 to 300) The amount of time in seconds the
router will wait and sample the BOD Criteria before adding bandwidth once the
throughput exceeds the BOD High Threshold. This prevents costly bandwidth
from being unnecessarily added due to temporary bursts in traffic.
Subtract Bandwidth Delay (sec) – (0 to 300) The amount of time in seconds the
router will wait and sample the BOD Criteria before subtracting bandwidth once
the throughput falls below the BOD Low Threshold. This prevents bandwidth
from being unnecessarily subtracted due to temporary lulls in traffic.
The example Multi-link PPP settings shown in the Multi-Link PPP Configuration
window above assumes that ISDN 1 and ISDN 2 each have a 64kbps connection
configured to dial up to the Internet. When ISDN 1 receives a packet destined for the
Internet it will dial the ISP and establish a connection. If the total throughput on
ISDN 1 (TX + RX) ever exceeds 80% of the 64kps (51.2kps), the router will sample
the line for an additional 5 seconds. If the traffic continuously exceeds 80% for the 5
second delay time, ISDN 2 will dial up and add bandwidth to the connection.
Assuming sustained traffic of 70kps, MLPPP will balance the traffic on the two
ISDN ports so they are handling roughly 35kps each. If the traffic on ISDN 1 +
ISDN 2 falls below 20% of the 128kps connection (25.6kps) for more than 10
seconds, ISDN 2 will hang up and all traffic will be handled by ISDN 1.
For the above configuration to work, both ISDN ports need to have been properly
setup to establish dial-out PPP connections, and have Multi-Link enabled. Also note
that ISDN 1, being the B-channel that initiated the call in the MLPPP bundle and
thus the primary link, is not subject to the BOD Low Threshold parameter and will
never hang up due to BOD considerations. The primary link can, however, be
subject to Dial on Demand (DOD) settings, and could thus disconnect if Dial on
Demand is enabled and the Idle Time parameter is met. Dial on Demand settings are
located in the Advanced Functions, Dial Configuration submenu.
Admin Configuration
This feature allows you to define two names and two passwords, respectively, for
logging in to the router for configuration and management, and is shown below:
65
DI-206 ISDN Remote Router
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