Cisco Systems 15454-FTF2 12.12 In-Service Topology Upgrades

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Cisco ONS 15454 Reference Manual, R8.5.x

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Chapter 12 SONET Topologies and Upgrades

12.11.1 Span Upgrade Wizard

Note Span upgrades do not upgrade SONET topologies (for example, a 1+1 group to a two-fiber BLSR). Refer

to the Cisco ONS 15454 Procedure Guide for topology upgrade procedures.

The Span Upgrade Wizard automates all steps in the manual span upgrade procedure (BLSR, path

protection, and 1+1). The wizard can upgrade both lines on one side of a four-fiber BLSR or both lines

of a 1+1 group; the wizard upgrades path protection configura tions and two-fiber BLSRs one line at a

time. The Span Upgrade Wizard requires that all working spans have DCC enabled.

The Span Upgrade Wizard provides no way to back out of an upgrade. In the case of a n error, you must

exit the wizard and initiate the manual procedure to either continue with the upgrade or back out of it.

To continue with the manual procedure, examine the standing conditions and alarms to identify the stage

in which the wizard failure occurred.

Manual span upgrades are mainly provided as error recovery for the Span Upgrade Wizard, but they can

be used to perform span upgrades. Downgrading can be performed to back out of a span upgrade. The

procedure for downgrading is the same as upgrading except that you choose a l ower-rate card type. You

cannot downgrade if circuits exist on the STSs that will be removed (the higher STSs).

Procedures for manual span upgrades can be found in the “ Upgrade Cards and Spans” chapter in the

Cisco ONS 15454 Procedure Guide. Five manual span upgrade options are available:

• Upgrade on a two-fiber BLSR

• Upgrade on a four-fiber BLSR

• Upgrade on a path protection configuration

• Upgrade on a 1+1 protection group

• Upgrade on an unprotected span

12.12 In-Service Topology Upgrades

Topology upgrades can be performed in-service to convert a live network to a different topology. An

in-service topology upgrade is potentially service-affecting, and generally allows a traffic hit of 50 ms

or less. Traffic might not be protected during the upgrade. The following i n-service topology upgrades

are supported:

• Unprotected point-to-point or linear ADM to path protection

• Point-to-point or linear ADM to two-fiber BLSR

• Path protection to two-fiber BLSR

• Two-fiber to four-fiber BLSR

• Node addition or removal from an existing topology

You can perform in-service topology upgrades irrespective of the service state of the involved

cross-connects or circuits; however, a circuit must have a DISCOVERED status.