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Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide by Wendell Odom

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Troubleshooting Layer 2 Problems

Data link layer problems on serial links usually result in at least one of the routers having a serial interface status of up/down. In other words, the line status (the first status code) is up, while the second status (the line protocol status) is down. Table 12-6 summarizes these types of problems.

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Table 12-6 Likely Reasons for Data Link Problems on Serial Links

Note

As with the other troubleshooting topics in this book, Table 12-6 lists some of the more common types of failures but not all.

The first of ...

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