
3;%(
Data Sheet
2-36
04.2000
)XQFWLRQDO'HVFULSWLRQ
)LJXUH
([DPSOHRI)(QGWR(QG/RRSEDFN3URFHVVLQJ
))6HJPHQW/RRSEDFN3URFHVVLQJ
If the LB indication bit of an LB cell is equal to 1 and an LB location ID of the LB cell is equal to
the network element ID (LB location ID match) the loopback indication flag is set to 0 and the LB
cell is looped back (loopback point, see
ILJXUH
cell is forwarded to the terminating segment point. This cell is looped back at the terminating
segment point (see
ILJXUH
, marker
ì
). If the LB location ID flag is disabled or an LB location
ID mismatch occurs the LB cell is forwarded to the terminating segment point (see
ILJXUH
marker
ú
)
, marker
ó
). Additionally the unchanged LB
,
7DEOH
/%
LQGLFDWLRQ
1
(QGWR(QG/RRSEDFN3URFHVVLQJ
/%VWDWH
/%/RFDWLRQ
6RXUFH,')ODJ
don’t care don’t care
/%/RFDWLRQ
6RXUFH,'
don’t care
/RRSEDFN$FWLRQ
forward LB cell to terminating end
point
forward LB cell to terminating end
point
copy of LB cell to μP receive cell
buffer
forward LB cell to terminating end
point
forward LB cell to terminating end
point
0
0
don’t care
don’t care
1
disabled
enabled
don’t care
match
enabled
mismatch
AOPE
LB status = 1
AOPE
LB status = 0
AOPE
LB status = 1
AOPE
insertion of F4 LB cell
drop LB cell to μP
receive cell buffer
copy LB cell to μP receive cell buffer when LB
status and LB source ID match and LB cell is
allready looped
AOPE
configured as an
F5 orginating end point
configured as an
F4 originating end point and
F5 originating segment point
configured as an
F4 intermediate point
configured as an
F5 terminating end point
configured as an
F4 terminating end point and
F5 terminating segment point
configured as an
F4 intermediate point
configured as an
F4 terminating end point and
F5 intermediate point
configured as an
F4 originating end point and
F5 intermediate point
AOPE
configured as an
F5 terminating segment and
F5 terminating end point
configured as an
F5 originating segment and
F5 originating end point
LB cell
looped back
configured as an
F4 intermediate point
configured as an
F4 intermediate point
set LB indication
flag to 0
set LB indication
flag to 0
1
2
3
4
5