AROW Series
Data Diode
Installation and Operation
7-1
7.
REDUNDANCY FEATURES (AROW-0610 only)
In this Section
I
NTRODUCTION
7-1
F
AILURE
C
ONDITIONS
7-1
L
OSS OF
G
IGABIT
E
THERNET LINK
7-1
L
OSS OF POWER
(
CATASTROPHIC MODULE FAILURE
)
7-1
W
ATCHDOG TIMEOUT
(F
UNCTIONAL MODULE FAILURE
)
7-2
L
OSS OF OPTICAL CONNECTIVITY
7-2
F
AILOVER
M
ECHANISM
7-2
Introduction
AROW-0610
is an optical data diode with fully redundant data paths.
This section will describe the conditions in which a backup module will
take over from a live module, how and how fast this handover occurs and
what action need to be taken to bring the system back to full redundancy.
This section does not apply to types
AROW-0510
and
AROW-0520
Failure Conditions
These are the conditions in which a backup module will take over from a
live module.
Loss of Gigabit Ethernet link
A loss Gigabit Ethernet link is detected by the physical interface when
the Ethernet cable is removed or the connected switch or router looses
power. The backup module will be notified of the loss of connectivity.
Backup module becomes live as soon as it receives this message.
The only noticeable data repercussion is a network slow down while
switch over happens.
Loss of power (catastrophic module failure)
When a backup module detects that the live/backup link goes down, it
assumes the live module has lost power and immediately takes over as
live module.
Data errors may occur as the live module fails as well as a network slow
down while switch over happens.
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