Cisco Crosswork Planning Design 7.2.x User Guide

LSP simulation diagnostics

Updated: August 14, 2026

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Provides details about the LSP simulation diagnostic tool, including its features and behaviors for analyzing simulated routing and LSP path issues.

To help troubleshoot RSVP LSP and LSP path simulations, Cisco Crosswork Planning analyzes simulation routes and provides reasons for certain types of routing behavior. The simulation diagnostics tool identifies why an LSP is not routed, why an LSP is routed away from its actual path, and why an LSP is not following the shortest TE path.

The diagnostic reports assume that all other LSPs, except for the one being tested, have been routed. That is, Cisco Crosswork Planning calculates whether an LSP can route on the actual path after all other routed LSPs have had their bandwidth reserved.

Note that running a report overwrites the previous report of the same type. For example, an LSPs diagnostic report would overwrite the previous LSPs report, but not the LSP path diagnostic report.

Run LSP simulation diagnostics

Use this task to run simulation diagnostics.

Procedure

	1.	Open the plan file (refer to Open plan files). It opens in the Network Design page.
	2.	From the toolbar, choose Actions > Tools > Diagnostics > LSP simulation or LSP path simulation.
	3.	Select the LSPs or the LSP paths you want to optimize.
	4.	Click Submit. A diagnostic report is automatically generated. You can access this report at any time by choosing Actions > Reports > Generated reports, and then clicking the LSP Routing Diagnostics or LSP Path Routing Diagnostics link in the right panel.

Simulation diagnostics for LSP routing failures

Simulation diagnostics provide reasons that explain why an LSP or LSP path fails to route during simulation. This information helps identify specific reasons for routing failures during simulation.

The table lists the reasons and a brief description to assist in troubleshooting:

Table 1. LSP simulation diagnostic reasons
Reason	Description
Affinities	The affinity settings prevent the LSP or LSP path from routing.
Available BW	There is insufficient bandwidth to route the LSP or LSP path.
Explicit Hops	The route is determined by a named path that contains one or more explicit hops.
Hop Limit	The hop limit is too low.
Invalid Actual Path	The actual path is invalid and cannot be interpreted as an LSP route.
No Actual Path	The LSP does not have an actual path.
No Attempt	The LSP path is not routed because it is not a standby path and it is not the lowest routable path option for the LSP.
No Destination	There is no destination defined. The collected network might not contain the destination node of the LSP.
Simulation Option	The simulation option to use actual paths is not enabled.
TE not enabled	There are interfaces that the LSP or LSP path traverses that are not TE enabled.
Topology	The source and destination are disconnected.

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