Fault processing methods of the Cisco switches and Cisco routers

Fault processing method

One, network complexity

The general network, dial, including video, (ISDN, WAN, frame relay, ATM,... ), LAN, VLAN,...

Two, failure model

1, the definition of the problem (Define the Problem)

Detailed and accurate description of fault symptoms and potential causes

2, collecting detailed information (Gather Facts) R> source of information: the key to the user, the network management system, the router / machine

1) identify symptoms:

2) to reproduce the fault: check the fault still exists

3) to investigate the failure frequency:

4) range to determine the fault: there are three kinds of methods to establish the scope of fault

From the outside to inside? Treatment failure (Outside-In Troubleshooting): generally applicable to a plurality of host can not be connected to one or a set

1,from the inside to the outside fault treatment (Inside-Out Troubleshooting):

2,half fault treatment (Divide-by-Half Troubleshooting)

3,consider possibilities (Consider Possibilities) to consider possible reasons causing thefailureset up a plan of action (Create the Action Plan)

4,implement the action plan (Implement the Action Plan)

5,Is used to correct the cause of network fault. From the fault source, come up with treatmentfor each completed step, check whether the failure to solve

6, observe the action plan execution result (Observe Results)

7, if the action plan will not solve the problem, repeat the above process (Iterate as Needed)

Three, record the changes

In the plan of action to solve the problem, the part of the record as the fault processing,recording all the configuration changes.

The second chapter web documents

A, network baseline

The simplest way to solve network problems is the current configuration and the previous configuration compared.

Baseline document consists of a network and system documents is different, it includes:

Network configuration table?

Network topology?

The ES network configuration table?

ES network topology?

Considerations for creating a network:

1) to determine the scope of the document;

2) remain the same: the same information collection of all equipment in the network;

3) clear goal: to understand the use of the document;

4) documents are easy to use and access;

5) timely update the document.

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