Cisco ONS 15454 SDH Manual page 35

Chapter 11 Circuits and Tunnels
Create a Roll To Circuit before rolling a circuit with the source on Node 3 and the destination on Node 4.
Note
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.
Only single rolls can be performed using TL1. Dual rolls require the network-level view that only CTC
Caution
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 11-19
Figure 11-19
S
Figure 11-20
Figure 11-20
S
If a new segment is created on Nodes 3 and 4 using the Bridge and Roll wizard, the created circuit has
Note
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.
78-18119-01
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
Node 2
D
D
Node 2
Node 4
Original leg
New leg
Cisco ONS 15454 SDH Reference Manual, R8.5
11.17.3 Single and Dual Rolls
11-35