TR Troubleshooting - Bridge Problems 

 Is the failure symptom that no data traffic can get from one side of the bridge to the other, or is data intermittently getting corrupted when passing through the bridge? 
Go to page 7.1. 

Is the failure symptom that only partial data traffic can pass across the bridge? 
Go to page 7.2. 

Is the failure symptom that an overloaded bandwidth condition is present on a certain ring? 
Go to page 7.3. 

This procedure is generic as to the bridge manufacturer. For some of the troubleshooting steps men tioned on this page, you should also reference the bridge manufacturer's documentation for any special predefined methods for checking bridge configuration and for bridge testing. 



7.1 No data traffic can get from one side of the bridge to the other, or data is intermittently getting corrupted when passing through the bridge.

Thoroughly check the software and hardware configuration of the bridge.

Are any incorrect configuration parameters present in the bridge?

Take the necessary action to resolve the problem and retest the bridge for proper operation. If the failure symptom is gone, record the problem in the network maintenance and service log. If the problem still exists after retesting, go to the next step .

Attempt to run bridge diagnostics.

Did running the diagnostics produce any errors that identify a bridge failure?

Take the necessary action to resolve the problem and retest the bridge for proper operation. If the failure symptom is gone, record the problem in the network maintenance and service log. If the problem still exists after retesting, go to the next step .

A problem may still exist with the bridge, but to get more conclusive fault-isolation data, go to page 15 .

If after using this procedure you cannot conclusively locate the problem and you continue to find failure symptoms that point to a bridge problem, reference the manufacturer's instructions.



7.2 Only partial data traffic can pass across the bridge.

Thoroughly check the software and hardware configuration of the bridge.

Are any incorrect configuration parameters in the bridge?

Take the necessary action to resolve the problem and retest the bridge for proper operation. If the failure symptom is gone, record the problem in the network maintenance and service log. If the problem still exists after retesting, go to the next step .

Check the ring for source-routing problems with certain ring stations. Thoroughly examine the Routing Information field of the frames that are not being passed through the bridge.
Keep in mind that pa rticular ring stations can have a software application configuration problem in relation to the source-routing field that they are directly transmitting.

Did examining the ring for source-routing problems locate any specific problems with a certain ring station's Routing Information field?

Take the necessary action to resolve the source-routing problems with the respective ring station's source-routing parameters; then retest the bridge for proper operation. If the failure symptom is gone, record the problem in the network maintenance and service log. If the problem still exists after retesting, go to the next step .

Attempt to gather more conclusive fault-isolation data by thoroughly examining the Routing Information field from all the frames not being passed through the bridge. Go to page 15.

If after using this procedure you cannot conclusively locate the problem and you continue to find failure symptoms that point to a bridge problem, reference the manufacturer's instructions. 



7.3 An overloaded bandwidth condition is present on a certain ring.

Thoroughly check the bridge for any incorrect configuration parameters that can control the amount of traffic to be forwarded to another ring.

Are any incorrect configuration parameters present in the bridge?

Take the necessary action to resolve the problem and retest the bridge for proper operation. If the failure symptom is gone, record the problem in the network maintenance and service log. If the problem still exists after retesting, go to the next step .

Check the source ring for source-routing problems with certain ring stations. Thoroughly examine the Routing Information field of the frames possibly causing bandwidth problems in the destinati on ring.
Keep in mind that a particular ring station can have a software application configuration problem in relation to the source-routing field that it is directly transmitting.

Did examining the ring for source-routing problems locate any specific problems with a certain ring station's Routing Information field?

Take the necessary action to resolve the source-routing problems with the respective ring station's source-routing parameters, then retest the bridge for proper operation. If the failure symptom is gone, record the problem in the network maintenance and service log. If the problem still exists after retesting, go to the next step .

Attempt to gather more conclusive fault-isolation data by going to page 15.
Thoroughly examine the Routing Information field from all the frames for incorrect addressing information for source routing that may be causing an overhead problem from one ring to another. Look closely at the percentage of frames being forwarded that are overloading the destination ring with traffic.
If after using this procedure you cannot conclusively locate the problem and continue to find failure symptoms that point to a bridge problem, reference the manufacturer's instructions. 

 November 15,1996 

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