Loop Isolation - Planet FSD-1020 Manual

3-22

Loop Isolation

Loop Isolation is an important feature of the Desktop Switch FSD-1020,
supported only if the memory expansion module FSD-MAC is installed. This
condition could exist if two ports are inadvertently connected to each other
causing a loop.
The switching device can not sustain a loop because it produces Broadcast
Storm thereby jamming the system with looping packets. Desktop Switch
FSD-1020 supports isolating the looped ports. If the function is enabled, the
device will monitor all ports to see if there are any loops.
Once a loop is detected, it will disable any one of the two ports. The port
number outline-frame will blink indicating it has been temporarily isolated.
Every 10 minutes, the port will be released to see if it is still looping.
The function of LOOP ISOLATE is disabled at the time it shipped from
manufacturer. You have to enable the function through Mini-Console. The
command sequence is:
UNIT CONFIG > LOOP ISOLATE > ENABLE><Enter and hold>
After the command is entered, it will be saved in the EEPROM.
Sub-Menu
Loop
Isolation
Figure 3.12 Loop Condition.
Command To Set Press:
Enable Enter and hold
Operation
PLANET Desktop Switch