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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
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Chapter 7 Circuits and Tunnels
Bridge and Roll
Figure 7-10 Single Roll from One Circuit to Another Circuit (Source Changes)
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 Only single rolls can be performed using TL1. 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 7-11 illustrates a dual roll on the same circuit.
Figure 7-11 Dual Roll to Reroute a Link
Figure 7-12 illustrates a dual roll involving two circuits.
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