To highlight the shortest path between two IP addresses and highlight LFA path

General information

A Loop-Free Alternate (LFA) path is pre-computed by the node as a backup next-hop for forwarding in-transit and CPM-generated IP packets when the primary next-hop is not available. This path enables the node to resume forwarding IP packets to a destination prefix without waiting for the routing convergence. SPF with LFA highlights can be performed on OSPF,OSPFv3, and ISIS topology maps.

Steps
 
1 

Choose Tools→Route Analysis→Topology_type→IGP_Administrative_Domain from the NFM-P main menu. The appropriate IGP topology map opens.

2 

Perform one of the following:

  1. Specify the source and destination IP addresses on the Find Object form.

    1. Right-click on the map and choose Highlight→Paths→IP→SPF with LFA from the contextual menu. The Find Object form opens.

    2. Configure the First IP parameter and the Second IP parameter, or click Select to select routers.

    3. Click OK. The shortest path and the LFA path are highlighted.

  2. Specify the source and destination IP addresses on the topology map.

    1. Press the Ctrl key and click on a source and a destination router or link.

    2. Right-click and choose Highlight SPF with LFA. The shortest path and the LFA path are highlighted.

3 

To remove the SPF with LFA highlight, perform To manage active highlights on a topology map .

End of steps

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