Configuring a Loose Route

The default setting for the tunnel is to route it dynamically. Note that for Cisco tunnels, the path should be configured with loose routes to the ABR. To change the paths to configured loose routes, open the LSP Tunnel window in Modify mode from Modify > Elements > Tunnels. Click Modify and then select “All Entries” and change the Path Config. Options to “Add” “Config” to configure the route.

Notice that a loose route is now given in the Configured column, indicated by **.

Figure 1: Configured Loose Routes Network table showing node IDs, route types, priority levels, current and configured routing paths with IPs for managing routes.

Network table showing node IDs, route types, priority levels, current and configured routing paths with IPs for managing routes.

A route can also be manually configured. For example, select a tunnel and click Modify and then select “Selected Entries.” In the bottom half of the window, there is a table with the route for the tunnel. To configure the path, double-click the cell underneath the column “Configured Route”. Here you can enter in the path, using ** to indicate a loose route after the area border routers.

Note:

The Exclude-IP-Address feature is not currently supported for inter-area tunnels.

Figure 2: Configuring a Route for a Specific LSP Tunnel Network configuration interface for tunnels and paths. Title: Tunnels / Paths for this tunnel. Instruction: To choose paths, click links/nodes on map, then right-click in table. Table includes Pathname, Opt, and Configured Route columns. Buttons: Add Row and Delete Row.

Network configuration interface for tunnels and paths. Title: Tunnels / Paths for this tunnel. Instruction: To choose paths, click links/nodes on map, then right-click in table. Table includes Pathname, Opt, and Configured Route columns. Buttons: Add Row and Delete Row.

After configuring the routes as indicated in the previous step, LSP configlets can be generated for the newly created LSP tunnels. This is accomplished in Design mode, through Design > Confligets/Delta > LSP Configlet.

Figure 3: Example of an LSP Configlet Configuration snippet for a Cisco router defining an MPLS Traffic Engineering tunnel from SFO to NYC with explicit path and bandwidth reservation.

Configuration snippet for a Cisco router defining an MPLS Traffic Engineering tunnel from SFO to NYC with explicit path and bandwidth reservation.