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Chapter 11
Circuits and Tunnels
Dual rolls have several constraints:
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•
Figure 11-22
Figure 11-22
S
Figure 11-23
Figure 11-23
S
Note
If a new segment is created on Nodes 3 and 4 using the Bridge and Roll wizard, the created circuit has
the same name as the original circuit with the suffix _ROLL**. The circuit source is on Node 3 and the
circuit destination is on Node 4.
11.19.4 Two Circuit Bridge and Roll
When using the bridge and roll feature to reroute traffic using two circuits, the following constraints
apply:
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•
•
•
78-18106-01
You must complete or cancel both cross-connects rolled in a dual roll. You cannot complete one roll
and cancel the other roll.
When a Roll To circuit is involved in the dual roll, the first roll must roll onto the source of the
Roll To circuit and the second roll must roll onto the destination of the Roll To circuit.
illustrates a dual roll on the same circuit.
Dual Roll to Reroute a Link
Node 1
Original leg
New leg
illustrates a dual roll involving two circuits.
Dual Roll to Reroute to a Different Node
Node 1
Node 3
DCC must be enabled on the circuits involved in a roll before roll creation.
A maximum of two rolls can exist between any two circuits.
If two rolls are involved between two circuits, both rolls must be on the original circuit. The second
circuit should not carry live traffic. The two rolls loop from the second circuit back to the original
circuit. The roll mode of the two rolls must be identical (either automatic or manual).
If a single roll exists on a circuit, you must roll the connection onto the source or the destination of
the second circuit and not an intermediate node in the circuit.
11.19.4 Two Circuit Bridge and Roll
Node 2
D
D
Node 2
Node 4
Original leg
New leg
Cisco ONS 15454 Reference Manual, R8.5
11-45
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