User’s Manual
Custom Embedded Solutions
WIN Enterprises, Inc. [email protected] www-win-ent.com (978)688-2000
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Appendix B: LAN Bypass Programming Guide
WIN ENTERPRISES PL-80230 provides LAN bypass functionality to ensure that
data can still pass through the device, even when it is powered off. This feature helps
ensure the continuous flow of data through the device in the event of a hardware
failure. For network security appliances deployed at the gateway, for example, it is
crucial that they provide LAN bypass functionality to ensure that hardware failure on
these appliances will not bring down the entire network. Related BIOS settings are in
the “South Bridge Configuration” section.
1. LAN Bypass Definition
There are four bypass settings in BIOS setup.
Power off LAN Bypass1: Enable/Disable
Power on LAN Bypass1: Enable/Disable
Power off LAN Bypass2: Enable/Disable
Power on LAN Bypass2: Enable/Disable
Note: You must set “Power off LAN Bypass1” to “Enable” to get the “Power on LAN
Bypass1” setup item and set “Power off LAN Bypass2” to “Enable” to get the
“Power on LAN Bypass2” setup item.
There are three behaviors of the LAN Bypass function.
Power status
BIOS Bypass setting
Bypass Behavior
Power off LAN Bypass1/2: Disable
Power on LAN Bypass1/2: Disable
A
ON
Power off LAN Bypass1/2: Enable
Power on LAN Bypass1/2: Enable
B
Power off LAN Bypass1/2: Disable
*** Note
C
OFF
Power off LAN Bypass1/2: Enable
Power on LAN Bypass1/2: Disable
A
Note: If “Power off LAN Bypass1/2” set to “Disable”, the “Power on LAN
Bypass1/2” “Enable” can not be selected.
The PL-80230 provides four LAN ports with bypass function. The BIOS “Power
on/off LAN Bypass1” settings control LAN ports on CN30 & CN31 (Segment 1)
