Alcatel Omni Switch/Router, User Manual

Page: 875 / 1100

Page 29-3
Back-to-Back Frame Relay Configurations
Frame Relay switching modules may be connected “back-to-back” without an intervening
Frame Relay network or switch. Such connections are made by using private leased lines,
such as
T1
lines, instead of public Frame Relay networks usually over large geographic
distances.
No special user configuration is necessary for back-to-back connections. The
WSX
software
automatically detects that a Frame Relay Logical
DCE
(i.e., Frame Relay switch) is not present
and that there is another Frame Relay Logical
DTE
(i.e., another
WSX
,
FRAD
, bridge/router) on
the other end of the
WAN
connection. The
WSX
then automatically brings up a Permanent
Virtual Circuit identified with a
DLCI
of 32, which is the same value
IBM
uses in this scenario.
The
WSX
does not bring up
PVC DLCI 32
until it knows that it has established communication
with another
DTE
device rather than a Frame Relay switch.
Back-to-Back Frame Relay Configuration Using Serial Ports
WSX
T T T T1 1 1 1 L L L Liiiin n n ne e e e
S S
S Se
e
e errrriiiia
a
a allll
D D
D DT
T
T TE
E
E E----D
D
D DC
C
C CE
E
E E
WSX
T T T T1 1 1 1
M M
M Mu
u
u ullllttttiiiip
p
p plllle
e
e ex
x
x xe
e
e errrr
T T T T1 1 1 1
M M M Mu u u ullllttttiiiip p p plllle e e ex x x xe e e errrr
C C C Ca a a ab b b blllle e e e
S S
S Se
e
e errrriiiia
a
a allll
D D
D DT
T
T TE
E
E E----D
D
D DC
C
C CE
E
E E
C C C Ca a a ab b b blllle e e e
O O O Om m m mn n n niiii S S S Sw w w wiiiittttc c c ch h h h////R R R Ro o o ou u u utttte e e errrr O O O Om m m mn n n niiii S S S Sw w w wiiiittttc c c ch h h h////R R R Ro o o ou u u utttte e e errrr