Table of Contents
Advertisement
DI-206 ISDN Remote Router
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.
108
Management
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.
Configuration and
Advertisement
Table of Contents
