Behavior Models Cookbook - TCP Status Models - TcpRetransAlg -
TcpConnMon      TcpRetransMon

TcpRetransAlg

Path: /model/tcp_status/tcp_retrans_alg.mod

Checks all devices that support the tcp MIB-II group and verifies that their transmission algorithm is the most efficient. An inefficient retransmission algorithm can severely affect the network efficiency of the device. If a device with an inefficient retransmission algorithm is found, NerveCenter sends a 7006 Inform to the platform.

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   The most efficient TCP retransmission algorithm currently available is Van Jacobson's Algorithm.

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Two additional alarms, TcpRetransAlg_LogToDB and TcpRetransAlg_LogToFile, are part of this model. When you enable these alarms, they perform a Log To Database or a Log to File alarm action, respectively, on each transition so that reports on TCP transmission algorithms can be produced.

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   The LogToDB alarm, works on Windows only.

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Property

The following property must be in the property group for the nodes you want to monitor:

tcp

Trigger Generators

Below is a list of the objects that generate triggers:

• TcpRetransAlg (poll)

Events Sent to OpenView

Events Sent to OpenView by TcpRetransAlg summarizes the events this behavior model sends to OpenView:

Events Sent to OpenView by TcpRetransAlg

For complete information about events sent to OpenView, see the trapd.conf.txt file shipped with these behavior models residing in:

/model/tcp_status

For more information about integrating NerveCenter with OpenView, or the other NerveCenter-supported network manager platforms, refer to the book Integrating NerveCenter with a Network Management Platform.

Optional Customization

Below is a list of behavior model settings that you might want to customize to suit the requirements of your site.

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   It's a good practice to rename the behavior model objects that you modify. Whenever you import a model, NerveCenter will overwrite objects with the same name.

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• Poll intervals
• Change Inform to Inform Platform for Netcool, TME, Unicenter
• Log To File alarm action options
  (file pathname, log action variables, verbose or non-verbose output)
• Log To Database alarm action options
  (log identity number and log action variables)