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Cisco ONS 15454 Reference Manual, R7.0
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Chapter 11 Circuits and Tunnels
11.19 11.18.4 Two Circuit Bridge and Roll
Figure 11-22 Dual Roll to Reroute to a Different Node
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.

11.18.4 Two Circuit Bridge and Roll

When using the bridge and roll feature to reroute traffic using two circuits, the following constraints
apply:
• 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.

11.18.5 Protected Circuits

CTC allows you to roll the working or protect path regardless of which path is active. You can upgrade
an unprotected circuit to a fully protected circuit or downgrade a fully protected circuit to an unprotected
circuit with the exception of a path protection circuit. When using bridge and roll on path protection
circuits, you can roll the source or destination or both path selectors in a dual roll. However, you cannot
roll a single path selector.
11.19 Merged Circuits
A circuit merge combines a single selected circuit with one or more circuits. You can merge VT tunnels,
VAP circuits, CTC-created circuits, VCAT members, and TL1-created circuits. To merge circuits, you
choose a circuit in the CTC Circuits window and the circuits that you want to merge with the chosen
(master) circuit on the Merge tab in the Edit Circuits window. The Merge tab shows only the circuits that
are available for merging with the master circuit:
• Circuit cross-connects must create a single, contiguous path.
83102
Node 1
SD
Node 2
Node 4Node 3
Original leg
New leg