Finisar Surveyor User Manual

10-44

Counter

Non Responsive Station is a counter of all non-responsive stations over a period of 
time per segment. A non-responsive station is defined as successive TCP/IP 
retransmissions over the same connection that are greater than a threshold value. A 
count of all non-responsive stations displays in the 

 counters of Expert 

View. A threshold for the number of Non Responsive Station events can be set in 
Expert Alarms.

Expert Analysis

Non Responsive Station events are automatically logged as expert analyses. The 

 field provides the IP address of the non-responsive station. For 

example:

Station [206.250.228.11] not responding

The threshold value for the number of retransmissions can be changed. The default 

threshold is 3 successive retransmissions. 

Diagnostic Details

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The threshold set for consecutive retransmissions has been exceeded. 
This resulted in a Non Responsive Station symptom.

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1. An ACK sent by the receiver was lost. 
2. The network is overloaded.
3. The path to the receiving station has long delays. 
4. There may be a problem with the receiver’s TCP/IP stack.
5. There may be an overloaded switch or router.

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1. Load balance your network.
2. If you see repeated delays and too many retransmissions, your router or switch may 

need upgrading.