Cisco Systems ONS 15600 manual 12illustrates a dual roll on the same circuit

Chapter 7 Circuits and Tunnels

7.13.3 Single and Dual Rolls

Figure 7-11

S

Single Roll from One Circuit to Another Circuit (Source Changes)

Node 1 Node 2 D

S2

Node 3

Node 4

Original leg

New leg

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Note Create a Roll To Circuit before rolling a circuit with the source on Node 3 and the destination on Node 4.

A dual roll involves two cross-connects. It allows you to reroute intermediate segments of a circuit, but keep the original source and destination. If the new segments require new cross-connects, use the Bridge and Roll wizard or create a new circuit and then perform a roll.

Caution If you are using TL1 to perform rolls, this interface can only be used for single rolls. Dual rolls require the network-level view that only CTC or CTM provide.

Dual rolls have several constraints:

•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.

Figure 7-12illustrates a dual roll on the same circuit.

Figure 7-12 Dual Roll to Reroute a Link

S

Node 1

Node 2

D

Original leg New leg

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Figure 7-13illustrates a dual roll involving two circuits.

Cisco ONS 15600 Reference Manual, R7.2

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