Fast and efficient troubleshooting of L2F is dependent upon a good understanding of L2F protocol operation, L2F configuration, and PPP. Additionally, if remote access clients dial into the NAS, a good knowledge of ISDN and asynchronous modems is also important. In this section, you will see how to apply the end-to-end troubleshooting methodology to L2F.
The flowchart in Figure 2-26 describes the troubleshooting process used with L2F. You can use this flowchart to quickly access the section of the chapter relevant to problems you are experiencing on your network.
Figure 2-26. L2F Troubleshooting Flowchart
Before beginning the troubleshooting process, it is worth briefly re-examining the tunnel establishment ...