Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
277
function
can
join
one
group
of
redundant
gateways
to
serve
as
the
backup
one
for
the
master
gateway.
Fill
same
values
of
virtual
server
ID
and
IP
for
these
gateways,
and
each
gateway
owns
its
own
priority
as
the
sequence
in
the
backup
list.
They
construct
a
VRRP
redundant
gateway
group.
Following
diagram
illustrates
the
group
example
with
two
member
gateways.
Scenario
Application
Timing
When
the
enterprise
gateway
needs
a
reliable
connection
to
the
Internet,
administrator
can
setup
a
group
of
VRRP
redundant
gateways
as
the
enterprise
entry
gateway.
Each
member
gateway
connects
to
different
ISP
for
a
redundant
connection
to
the
Internet.
So,
the
enterprise
gateway
is
reliable
even
the
master
connection
is
failed.
Scenario
Description
When
the
master
gateway
is
disabled
of
its
Internet
connection,
the
backup
gateway
whose
priority
is
the
highest
among
the
ones
with
alive
Internet
connection
will
take
over
the
data
communication
duty
and
serves
as
the
master.
Once
the
backup
gateway
is
recovered
from
terminated
Internet
connection
and
its
priority
is
higher
than
the
one
of
the
master
gateway,
the
data
communication
duty
will
return
to
it.
Parameter
Setup
Example
