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| 7.1 |  | Troubleshooting the Application Layer |
| 7.1.7 |  | Correcting application layer problems |

Figure shows the steps for correcting application layer problems.

Use the following steps:

1. Make a backup. Before proceeding, ensure that a valid configuration has been saved for any device on which the configuration may be modified. This provides for recovery to a known initial state.
2. Make initial hardware and software configuration changes. If the correction requires more than one change, make only one change at a time.
3. Evaluate and document the change and the results of each change. If the results of any problem-solving steps are unsuccessful, immediately undo the changes. If the problem is intermittent, wait to see if the problem occurs again before evaluating the effect of any change.
4. Verify that the change actually fixed the problem without introducing any new problems. The network should be returned to the baseline operation and no new or old symptoms should be present. If the problem is not solved, undo all the changes. If new or additional problems are discovered, modify the correction plan.
5. Stop making changes when the original problem appears to be solved.
6. If necessary, get input from outside resources. This may be a coworker, consultant, or Cisco Technical Assistance Center (TAC). On rare occasions a core dump may be necessary, which creates output that a specialist at Cisco Systems can analyze.
7. Once the problem is resolved, document the solution.