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7-22
Cisco ONS 15600 Reference Manual, R7.2
Chapter 7 Circuits and Tunnels
7.13 Bridge and Roll
7.13 Bridge and Roll
The CTC Bridge and Roll wizard reroutes live traffic without interrupting service. The bridge process
takes traffic from a designated “roll from” facility and establishes a cross-connect to the designated “roll
to” facility. When the bridged signal at the receiving end point is verified, the roll process creates a new
cross-connect to receive the new signal. When the roll completes, the original cross-connects are
released. You can use the bridge and roll feature for maintenance functions such as card or facility
replacement, or for load balancing. You can perform a bridge and roll on the following ONS platforms:
ONS 15600, ONS 15454, ONS 15454 SDH, ONS 15327, and ONS 15310.
7.13.1 Rolls Window
The Rolls window lists information about a rolled circuit before the roll process is complete. You can
access the Rolls window by clicking the Circuits > Rolls tabs in either network or node view. Figure 7-7
shows the Rolls window.
Figure 7-7 Rolls Window
The Rolls window information includes:
•
Roll From Circuit—The circuit with connections that will no longer be used when the roll process
is complete.
•
Roll To Circuit—The circuit that will carry the traffic when the roll process is complete. The Roll
To Circuit is the same as the Roll From Circuit if a single circuit is involved in a roll.
•
Roll State—The roll status; see the “7.13.2 Roll Status” section on page 7-23 for information.
•
Roll Valid Signal—If the Roll Valid Signal status is true, a valid signal was found on the new port.
If the Roll Valid Signal status is false, a valid signal was not found. It is not possible to get a true
Roll Valid Signal status for a one-way destination roll.
•
Roll Mode—The mode indicates whether the roll is automatic or manual.
CTC implements a roll mode at the circuit level. TL1 implements a roll mode at the cross-connect
level. If a single roll is performed, CTC and TL1 behave the same. If a dual roll is performed, the
roll mode specified in CTC might be different than the roll mode retrieved in TL1. For example, if
you select Automatic, CTC coordinates the two rolls to minimize possible traffic hits by using the
Manual mode behind the scenes. When both rolls have a good signal, CTC signals the nodes to
complete the roll.
–
Automatic—When a valid signal is received on the new path, CTC completes the roll on the
node automatically. One-way source rolls are always automatic.