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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 11-20

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

Node 4

Original leg

New leg

Cisco ONS 15454 SDH Reference Manual, R8.5

11.17.3 Single and Dual Rolls

11-35