Auto-Tunnel Creation
If you choose No when prompted with "Generate auto tunnels from atconfig file?" in the previous step, then the tool will not create any auto-tunnels. You may still generate the auto-tunnels at a later time by switching to Design mode and then choosing one of the three options under the Auto Tunnel Design menu (Design > TE Tunnels > Auto Tunnel Design) as shown in the following figure. Selecting Auto Mesh or Backup will cause the tool to generate mesh group auto-tunnels or backup auto-tunnels, respectively.
To generate both mesh group and backup auto-tunnels, choose the All option.
![Auto Tunnel Design Menu](../../images/s004008.gif)
If you choose Yes when prompted with "Generate auto tunnels from atconfig file?" in the previous step and your network configuration files have auto-tunnels configured, then the tool proceeds to create auto-tunnels using the information stored in the atconfig file. If backup auto-tunnels are configured in the network, then FRR design is performed in the background to provide FRR node or FRR link protection for the primary tunnel. To view the auto-tunnels created by the tool, bring up the Tunnels window (Network > Elements >Tunnels) as shown in the following figure:
![Auto-Tunnels Tagged With “AT” in the Type fField](../../images/s004009.gif)
The figure has the Type column expanded to show that auto-tunnels have been tagged with an "AT" flag. In this example, routers LR2 & RR2 have mesh group & backup auto-tunnels configured, as indicated by the corresponding "AT" flag.
If you wish to filter for only auto-tunnels, you may use the advanced filter. Set "Type=AT" for the Enter query box and choose Match Substring as the Search Preference, as shown in the following figure.
![Filtering for Auto-Tunnels](../../images/s004010.gif)
The resulting filtered tunnels window is shown in the following figure:
![Tunnels Window Showing Only Auto-Tunnels](../../images/s004011.gif)
If auto-tunnels have been generated by the tool, and you exit without first saving, then you will be prompted with the following popup message window.
![Click Yes to Save Auto-Tunnels](../../images/s004012.gif)
Clicking on Yes will cause the auto-tunnels to be saved and placed into an autotunnel.runcode file. An example is shown in the following figure
![Auto-Tunnels Saved](../../images/s004013.gif)