3Com 3C780 User Guide - Page 97

set le, cutoff

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4-10 Setting Up the Hub LER_Cutoff. This threshold is the link error rate at which a faulty or poor link connection will be broken. The factory-set default is 10.E-07 (10-7). If the LER exceeds the limits set by this option, the hub will automatically reestablish the connection to this port. If this is not possible, the port will be bypassed until the fault is corrected. To change the LER_Cutoff parameter, follow these steps: 1. Enter the set ler cutoff command. Type: set ler cutoff [Enter] You are prompted for the module number and the port number. Module? Port? The current LER values are displayed, followed by a prompt for your response. For example: Current LER Alarm exponent = 8 Current LER Cutoff exponent = 7 LER cutoff [4...8]? 2. Enter the new LER cutoff value. For example, type: 7 [Enter] If you enter a cutoff value that is more than the current alarm value, this message appears: Error: The cutoff exponent must be

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4-10
Setting Up the Hub
LER_Cutoff
.
This threshold is the link error rate at which a faulty or poor link
connection will be broken.
The factory-set default is 10.E-07 (10
-7
).
If the
LER exceeds the limits set by this option, the hub will automatically reestablish
the connection to this port.
If this is not possible, the port will be bypassed until
the fault is corrected.
To change the LER_Cutoff parameter, follow these steps:
1.
Enter the
set le
r
cutoff
command.
Type:
set ler cutoff [Enter]
You are prompted for the module number and the port number.
Module?
Port?
The current LER values are displayed, followed by a prompt for your
response.
For example:
Current LER Alarm exponent = 8
Current LER Cutoff exponent = 7
LER cutoff [4...8]?
2.
Enter the new LER cutoff value.
For example, type:
7 [Enter]
If you enter a cutoff value that is more than the current alarm value, this
message appears:
Error:
The cutoff exponent must be <= current alarm
exponent.
Set cutoff exponent <= 8 or change the alarm
value.
If you enter a cutoff value greater than 15, this message appears:
Error:
Cutoff must be in the range 4 to 15
Changes to these parameters take effect immediately.
The
show ports
command
displays the current values of these parameters.