Cisco Systems 15310-MA manual 11illustrates a dual roll on the same circuit

Chapter 7 Circuits and Tunnels

Bridge and Roll

Figure 7-10

S

S2

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

Node 1	Node 2		D
Node 3	Node 4
			134274
		Original leg

New leg

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 7-11illustrates a dual roll on the same circuit.

Figure 7-11 Dual Roll to Reroute a Link

S

Node 1

Node 2

D

Original leg New leg

83268

Figure 7-12illustrates a dual roll involving two circuits.

Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2

78-19417-01 7-21