Trend Micro™ Network VirusWall™ Enforcer 1500i Installment and Deployment Guide
3-16
Failopen
Failopen or LAN bypass involves one Network VirusWall Enforcer device. Failopen is a
fault-tolerance solution that allows a Network VirusWall Enforcer to continue passing
network traffic even when other device components fail or when the device loses power.
Failopen Considerations
Consider the following important points about failopen:
•
If the switches on your network do not support auto MDI/MDI-X, use a crossover
and non-crossover cable combination to enable failopen. Invalid cable combinations
prevent Network VirusWall Enforcer from using failopen and can result in network
issues. Refer to device documentation to determine whether your L2 switches
support auto MDI/MDI-X.
•
All regular ports on the device support LAN bypass and will allow traffic bypass
even when the device is powered off.
•
To help ensure that failopen works, keep the total length of the network cable
connecting regular ports to other devices within 100 meters (~328 feet). Resetting a
Network VirusWall Enforcer device with failopen enabled temporarily blocks
network connection for about 30 seconds.
•
describes the connection status of ports when certain procedures are
performed.
T
ABLE
3-1.
Port status
T
IME
(
SECONDS
)
P
ROCEDURE
R
EGULAR
P
ORTS
WITH
F
AILOPEN
2
Restarting the device
Disconnected
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