Cisco Systems 15454-FTF2 11.20 Merged Circuits

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Cisco ONS 15454 Reference Manual, R8.5.x

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Chapter 11 Circuits and Tunnels

11.19.5 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 fu lly 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 du al roll. However, you cannot

roll a single path selector.

11.20 Merged Circuits

A circuit merge combines a single selected circuit with one or more circuits. You can merge VT tunnels,

VAP circuits, VCAT members, CTC-created circuits, 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.

• Circuits types must be a compatible. For example, you can combine an STS circuit with a VAP

circuit to create a longer VAP circuit, but you cannot combine a VT circuit with an STS circuit.

• Circuit directions must be compatible. You can merge a one-way and a two-way circuit, but not two

one-way circuits in opposing directions.

• Circuit sizes must be identical.

• VLAN assignments must be identical.

• Circuit end points must send or receive the same framing format.

• The merged circuits must become a DISCOVERED circuit.

If all connections from the master circuit and all connections from the merged circuits align to form one

complete circuit, the merge is successful. If all connections from the master circuit and some, but not

all, connections from the other circuits align to form a single complete circuit, CTC notifies you and

gives you the chance to cancel the merge process. If you choose to continue, the aligned connections

merge successfully into the master circuit, and the unaligned connections remain in the original circuits.

All connections in the completed master circuit use the original master circuit name.

All connections from the master circuit and at least one connection from the other selected circuits must

be used in the resulting circuit for the merge to succeed. If a merge fails, the master circuit and all other

circuits remain unchanged. When the circuit merge completes successfully, the resulting circuit retains

the name of the master circuit.

You can also merge orderwire and user data channel (UDC) overhead circuits, which use the overhead

bytes instead of frame payload to transfer data. To merge overhead circuits, you choose the overhead

circuits on the network view Provisioning > Overhead Circuits window. You can only merge orderwire

and UDC circuits.