enables what-if analysis on existing network designs,
simulates network behavior under failure scenarios, and
determines the ability to reroute services without providing guidance for expanding network infrastructure.

Table 1. Feature History
Feature Name	Release Information	Feature Description
What-if Analysis for OTN Services	Cisco ONP Release 4.1	This feature extends the current implementation of What-if analysis for the OTN Services that are connecting the aggregated nodes. The failure report includes the number of failed services, restored services, and unrestored services. This feature is supported forsworn (4K-1K-2K and 1K-2K) and non-SSON (4K-2K) networks.

Advantages of plan mode

The advantages of the plan mode are:

Simulates and analyzes potential network issues and solutions,
focuses on rerouting capabilities, and
avoids requiring physical changes to network infrastructure.

Supported network elements

Supported network elements in plan mode include:

An NCS 2000 aggregated node that includes ROADM, OLA, and passthrough nodes
Traffic nodes including1K-2K, 4K-2K, and 4K-1K-2K
Nodes created in Cisco ONP
Networks imported from Cisco Transport Planner in mpz format
Networks imported from LNI

Limitations of plan mode

Plan mode has these limitations:

Only users with PLANNER and ADMIN roles can access the Plan mode.
Plan mode does not guide you in turning up new wavelengths or adding new network components.

Create a failure set

Use this procedure to create and manage failed fibers and sites as a failure set within a failure group. You can simulate or track network outages efficiently in a single action.

Before you begin

Procedure

	1.	Open a network and enter the Plan mode.
	2.	Click the Ellipsis icon next to the Failure Groups option in the network tree panel.
	3.	Click Add Failure Group. A failure group gets created.
	4.	Add fibers and sites to the group. Choose the Fibers and Sites to fail by selecting the check boxes next to them. Click the Ellipsis icon next to the chosen Fibers and Sites, and click Fail.
	5.	Click the Ellipsis icon next to the network name and click Add Failure Set.
	6.	Select the failure group to which the failed fibers or sites must be added. The system creates the failure set under the failure group and adds the failed fibers or sites to it. Note If a network has dark fibers that do not carry traffic, the system does not consider those paths for restoration.

Failure report

This table describes the various parameters of the failure report.

Table 2. Failure report
Report	Description
Failed Fibers	Shows the failed fibers in the network.
Failed Sites	Shows the failed sites in the network.
Impacted Fibers	Shows the fibers that are impacted due to the site failure.
Total Channels	Shows the total number of media channels in the network.
Failed Channels	Shows the total number of media channels that are passing through the failed ducts or sites in the network.
Restored Channels	Shows the total number of media channels that are restored from the failure state.
Unrestored Channels	Shows the total number of media channels that are not restored from the failure state due to the unavailability of alternate paths.
Fiber HotZones	Shows the fibers that have utilized greater than or equal to 80% of the bandwidth. You can modify the threshold by updating the value in the Feature.Properties file. Fiber: Shows the fibers that are listed under fiber hot zones. Utilization Before (%): Shows the percentage of bandwidth that is utilized before the channel restoration. Utilization After (%): Shows the percentage of bandwidth that is utilized after the channel restoration.
Total Services	Shows the total number of services going through the fiber that was failed.
Failed Services	Shows the number of failed services going through the fiber that was failed.
Restored Services	Shows the number of restored services going through the fiber that was restored.
Unrestored Services	Shows the number of unrestored services going through the fiber that was restored.

Automatic suggestion for regeneration sites in Plan mode

Automatic suggestion for regeneration sites in plan mode is a Cisco ONP feature that

analyzes optical channels for high and marginal risk of failure,
automatically proposes feasible regeneration sites in planning mode, and
allows users to incorporate these sites to ensure network optical feasibility.

This feature operates in Plan mode within Cisco ONP, leveraging a regeneration suggestion algorithm run by the Path Computation Element (PCE). It assesses network feasibility and presents suggested regeneration sites in the Feasibility Report for optically risky channels, streamlining the process of making the network optically feasible.

Table 3. Feature History
Feature Name	Release Information	Feature Description
Automatic Suggestion for Regeneration Sites	Cisco ONP Release 5.0	Cisco ONP displays feasibility report in the Plan mode. This report automatically suggests regeneration sites for the channels with high and marginal risk of failure. You can incorporate these regeneration sites in the optical network to make the channel optically feasible. This feature avoids multiple iterations required to manually create the regeneration sites and test the optical feasibility of large networks.

Supported scenarios for automatic regeneration site suggestion

Automatic regeneration site suggestion is supported for both SSON and non-SSON networks that have contentionless channels or waves between these site types:

NCS2K (ROADM) sites
4K-1K-2K (TRAFFIC) sites

If channels already have forced regeneration, suggestions are shown at the section level.

How automatic regeneration site suggestion works

Summary

The automatic regeneration site suggestion process identifies channels at risk of optical failure and proposes suitable regeneration sites to enhance network feasibility.

The key components involved in the process are:

Cisco ONP: Assesses network feasibility and displays the Feasibility Report in Plan mode.
PCE (Path Computation Element): Runs the regeneration suggestion algorithm to determine optimal regeneration site locations.
Feasibility Report: Presents the suggested regeneration sites and channel risk statuses for user review.

Workflow

The process involves these stages:

- Cisco ONP evaluates the optical feasibility of the network in Plan mode and identifies channels with high or marginal risk of failure (indicated as red and orange in the Optical Results page).
- Cisco ONP submits these channels to PCE, which executes a regeneration suggestion algorithm.
- The algorithm suggests regeneration sites for the identified channels.
- Upon entering Plan mode, Cisco ONP displays the recommended regeneration sites at the bottom of the map in the Feasibility Report.
- You can apply the suggested regeneration sites to improve optical feasibility or export the report for reference.

Result

The process enables rapid identification and application of regeneration sites to ensure optical feasibility for complex networks, minimizing manual intervention.

Apply the suggested regen sites

Use this procedure to apply the suggested regeneration sites to make the network optically feasible.

Before you begin

Procedure

	1.	Open an analyzed network.
	2.	Enter the plan mode.
	3.	Apply the suggested regen sites to the network. Choose Network > Open Feasibility Report. The Feasibility Report is displayed at the bottom of the map. Select the channels that require regeneration and click Apply. In the Suggested Regen Applied dialog box,click Ok .
	4.	Exit the Plan mode. Choose Network > Exit Plan Mode. Click Yes. The network gets automatically upgraded and saved as a new network. Channels with applied regens are unlocked. The Regen Sites property is automatically updated and becomes noneditable.
	5.	Analyze the network. On the Optical Results page, he SOL and EOL fields become green. Channels do not appear in the feasibility report again when you switch to plan mode.

Feasibility report

The Feasibility Report table encompasses several fields, which are crucial for assessing the optical feasibility of the network.

Table 4. Feasibility report
Field	Description
Channel Name	Displays the list of channels (trail and sections) that are not optically feasible.
Alarm	Displays the color of alarm (red, orange, or yellow)
Paths	Displays the actual path of the channel as hyperlink. If you click the link, the path is highlighted in the map.
Suggested Regens	Displays the intermediate sites that can be used as regen sites so that the channel becomes optically feasible.

The Suggested Regen field appears as NA in these situations:

Channels display yellow alarms, meaning the loss is negligible.
The loss is high and there are not enough available intermediate sites to compensate for the overall loss.
Intermediate sites without added contentionless sides are not considered for regeneration sites.

Export the feasibility report

Use this procedure to save the regeneration site suggestions and channel feasibility results for external use or recordkeeping.

The Feasibility Report in Cisco ONP Plan mode includes regeneration site suggestions for channels at risk. You may need to export this information.

Procedure

	1.	In the Plan mode, locate the Feasibility Report at the bottom of the map.
	2.	Click Export.

The Feasibility Report, including suggested regeneration sites, is exported for reference or further analysis.

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