Avaya Troubleshooting Routers Guide de dépannage télécharger pdf (Page 49)

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Chapter 2

Determining the Scope of a Problem

This chapter poses the initial questions you should answer to narrow the cause of

a problem to such topics as router operation, router software, the physical layer,

the data link layer, or the network layer. Subsequent chapters provide instructions

on how to isolate and solve problems further. The instructions in this chapter tell

you which chapters you should go to after determining the scope of a problem.

Determine the scope of a problem by researching and writing down the answers to

the following questions:

1. What are the symptoms of the problem?

The more information you have about the symptoms of the problem, the more

easily you can identify the cause.

2. When did each symptom begin?

Write down the time you learned about each symptom. Examine the event log

for event messages that indicate when the problem occurred. Read the event

message descriptions for clues.

3. What recent changes could have contributed to the problem?

• Reconﬁguration?

• Moved nodes?

• Added segments?

• Increased trafﬁc?

Note: The symptoms of a problem and the underlying cause of the problem are

not necessarily the same. For example, if you cannot ping an IP router, the

symptom is that you cannot ping the router; the cause may be a loose cable.

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Avaya Troubleshooting Routers Guide de dépannage Page 49