Redundant coupling
Redundancy L2E
Release
4.1
03/08
3.1
The variants of redundant coupling
23
One-Switch coupling Two-Switch coupling Two-Switch coupling
with control line
Use The two Switches are
in impractical topologi-
cal positions.
Putting the lines down
between them would
involve a lot of work for
two-Switch coupling.
The two Switches are
in practical topological
positions.
Putting down a control
line would involve a lot
of work.
The two Switches are
in practical topological
positions.
Putting down a control
line would not involve
much work.
Disadvantage If the Switch config-
ured for the redundant
coupling fails, no con-
nection remains be-
tween the networks.
Much work involved in
connecting the two
Switches to the net-
work (compared with
one-Switch coupling).
Much work involved in
connecting the two
Switches to the net-
work (compared with
one-Switch and two-
Switch coupling).
Advantage Less work involved in
connecting the two
Switches to the net-
work (compared with
two-Switch coupling).
If one of the Switches
configured for the re-
dundant coupling fails,
there is still a connec-
tion between the net-
works.
If one of the Switches
configured for the re-
dundant coupling fails,
there is still a connec-
tion between the net-
works.
Table 4: Selection criteria for the variants of the redundant coupling
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