Cisco Crosswork Planning Design 7.2.x User Guide

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Cisco Crosswork Planning Design 7.2.x User Guide

Multi-topology routing

Updated: August 14, 2026

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Describes how Cisco Crosswork Planning simulates multi-topology routing with specific rules for interface assignment and routing restrictions.

Cisco Crosswork Planning supports simulation of multi-topology routing. Interfaces can be assigned to one or more IGPs. Demands and LSPs can be assigned to a specific IGP, and will only route through interfaces belonging to that IGP. This multi-topology simulation uses these rules.

  • When an interface is common to more than one topology, all IGP properties of the interface (including the metric) must be the same in both topologies.

  • The IGPs must be defined to be of the same type, for example, OSPF or IS-IS. This is not a restriction in practice unless either the OSPF topology or the IS-IS topology uses multiple areas.

  • Demands and LSPs defined with a specific topology can only route over circuits belonging to that topology. A circuit belongs to a topology if either one of its interfaces does.

  • Demands and LSPs with no defined topology have no restrictions on routing. They are routed using the default topology, to which all interfaces belong.

Configure topologies

Complete these steps to create or delete topologies.

Procedure

1.

Open the plan file (refer to Open plan files). It opens in the Network Design page.
2.

From the toolbar, choose Actions > Edit > Topologies. The Topologies page opens.
3.

To create a new topology:

  1. Click Add icon.

  2. Enter the topology name.

  3. Click the Save button.
4.

To delete a topology:

  1. Select the row containing the topology you want to delete.

  2. Click the Delete button in the selected row or click Delete icon.

Add topologies to objects

Use this task to associate demands or LSPs with topologies. Once you have associated the topologies, you can view them by showing the Topology column in the respective tables (use the Show/hide table columns icon ().

Procedure

1.

Open the plan file (refer to Open plan files). It opens in the Network Design page.
2.

In the Network Summary panel on the right side, select one or more demands or LSPs from their respective tables.
3.

Click Edit icon.
4.

Select the desired topology or topologies.

  1. From the Topology drop-down list, select the desired topology. You can associate one topology to each demand or LSP.

    In case of LSPs, this drop-down is available under the Advanced tab.

  2. Save the changes.

By selecting from a similar Topology drop-down list, you can also add a topology to LSP meshes when creating them.

The selected demands or LSPs are now associated with the specified topologies and will appear in the Topology column when enabled in the respective tables.