Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
131
The
OSPF
gateway
will
forward
its
routing
information
to
other
routers
that
are
under
the
gateway
and
not
linked
to
the
enterprise
backbone.
Parameter
Setup
Example
Following
tables
list
the
parameter
configuration
as
an
example
for
the
OSPF
gateway
in
above
diagram.
Use
default
value
for
those
parameters
that
are
not
mentioned
in
the
tables.
Configuration Path
[Dynamic Routing]-[OSPF Configuration]
OSPF
■
Enable
Backbone Subnet
10.0.0.0/16
Configuration Path
[Dynamic Routing]-[OSPF Area List]
ID
1
2
Area Subnet
10.0.75.0/24 10.0.76.0/24
Area ID
10.0.75.254 10.0.76.254
Area
■
Enable
■
Enable
Scenario
Operation
Procedure
In
above
diagram,
the
OSPF
Gateway
is
one
gateway
of
the
enterprise
backbone
(area
code
is
0.0.0.0
and
area
subnet
is
10.0.0.0/16)
and
it
links
with
other
OSPF
gateways
in
the
backbone.
It
dominates
two
areas
of
subnets:
area
1
with
area
code
is
10.0.75.254
and
area
subnet
is
10.0.75.0/24,
and
area
2
with
area
code
is
10.0.76.254
and
area
subnet
is
10.0.76.0/24.
By
operating
with
OSPF
protocol,
the
OSPF
gateway
can
gather
the
routing
information
from
other
OSPF
gateways
in
the
enterprise
backbone.
And
then
it
forwards
the
routing
information
to
the
routers
in
its
dominated
areas.
Finally,
the
routers
in
the
dominated
areas
of
the
OSPF
Gateway
know
the
shortest
routing
path
for
each
destination
IP
address
of
outgoing
packets.
BGP
Scenario
Border
Gateway
Protocol
(BGP)
is
a
standardized
exterior
gateway
protocol
designed
to
exchange
routing
and
reachability
information
between
autonomous
systems
(AS)
on
the
Internet.
The
protocol
is
often
classified
as
a
path
vector
protocol
but
is
sometimes
also
classed
as
a
distance
‐
vector
routing
protocol.
The
Border
Gateway
Protocol
makes
routing
decisions
based
on
paths,
network
policies,
or
rule
‐
sets
configured
by
a
network
administrator,
and
is
involved
in
making
core
routing
decisions.
BGP
may
be
used
for
routing
within
an
AS.
In
this
application
it
is
referred
to
as
Interior
Border
Gateway
Protocol,
Internal
BGP,
or
iBGP.
In
contrast,
the
Internet
application
of
the
protocol
may
be
referred
to
as
Exterior
Border
Gateway
Protocol,
External
BGP,
or
eBGP.
