Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
133
(especially
if
they
are
multihomed).
Very
large
private
IP
networks
use
BGP
internally.
An
example
would
be
the
joining
of
a
number
of
large
OSPF
(Open
Shortest
Path
First)
networks
where
OSPF
by
itself
would
not
scale
to
size.
Another
reason
to
use
BGP
is
multihoming
a
network
for
better
redundancy,
either
to
multiple
access
points
of
a
single
ISP
or
to
multiple
ISPs.
Scenario
Description
The
BGP
gateway
dominates
an
autonomous
system
(AS)
of
networking
and
links
with
some
other
border
gateways
for
exchanging
routing
information.
The
BGP
gateway
will
distribute
the
collected
routing
information
in
its
dominated
AS.
Then
all
routers
in
the
AS
know
how
to
route
packets
to
other
AS.
Parameter
Setup
Example
Following
tables
list
the
parameter
configuration
as
an
example
for
the
BGP
gateway
in
above
diagram.
Use
default
value
for
those
parameters
that
are
not
mentioned
in
the
tables.
Configuration Path
[Dynamic Routing]-[BGP Configuration]
BGP
■
Enable
Self ID
100
Configuration Path
[Dynamic Routing]-[BGP Neighbor List]
ID
1
2
3 4
Neighbor IP
10.101.0.1 10.102.0.1
10.103.0.1 10.104.0.1
Neighbor ID
101 102
103 104
Neighbor
■
Enable
■
Enable
■
Enable
■
Enable
Scenario
Operation
Procedure
In
above
diagram,
the
BGP
Gateway
is
one
gateway
of
its
dominated
AS
(self
IP
is
10.100.0.1
and
self
ID
is
100)
and
it
links
with
other
BGP
gateways
in
the
Internet.
The
scenario
is
like
the
networking
in
one
ISP
to
be
linked
with
the
ones
in
other
ISPs.
By
operating
with
BGP
protocol,
the
BGP
gateway
can
gather
the
routing
information
from
other
BGP
gateways
in
the
Internet.
And
then
it
forwards
the
routing
information
to
the
routers
in
its
dominated
AS.
Finally,
the
routers
in
the
dominated
AS
of
the
BGP
Gateway
know
how
to
route
packets
to
other
AS.
