FinM
Deployment
Guide
Release
4.5.10
3
‐
9
Inter
Base
Handover
(IBHO)
Update
Message
Network
Guidelines
3.9
Inter
Base
Handover
(IBHO)
Update
Message
Fiber
in
Motion
provides
L2
connectivity,
so
all
L3
features
(routing
etc.)
are
handled
directly
between
the
on
‐
board
router
and
the
wayside
core
router.
The
advantage
of
this
mode
of
operation
is
that
no
routing
updates
are
needed
during
handovers,
facilitating
the
continuous
fast
handovers
needed
as
the
train
moves
along
the
track.
However,
there
will
be
other
L2
devices
(switches)
along
the
wayside
network
that
must
be
updated.
When
a
TMU
moves
from
one
TBS
to
the
next,
there
must
be
an
update
of
the
wayside
network
so
the
switches
know
the
new
data
path.
This
update
is
made
by
sending
an
update
message
to
the
wayside
core
router.
However,
we
do
not
wish
to
send
an
update
message
for
each
on
‐
board
device,
as
this
will
overload
the
system.
For
this
reason,
the
update
is
sent
regarding
only
1
device
‐
the
MAC
address
of
the
on
‐
board
router
(since
all
the
on
‐
board
devices
are
behind
it,
they
do
not
need
to
have
individual
update
messages
sent).
Содержание Transportation FiberinMotion
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