Tech Tip UCM: Effects of "perf-mon" service policy to every interface in both the in- and out-put directions

Document created by Michael_Schoellhorn Employee on Oct 2, 2014
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UCM 3.7

 

General question about using UCM with Cisco Medianet Performance Monitor:

 

Suppose I have a single Cisco router with three interfaces- gi01, gi02, and gi03.

If I apply the perf-mon service policy to every interface in the input direction, then perf-mon will be able to monitor RTP traffic streams in both directions, as show here:

 

Caller A  -->  gi01( X )gi02  --> Caller B

Caller A  <--  gi01( X )gi02  <-- Caller B

 

Question:  What would happen in UCM if I were to apply the perf-mon service policy to every interface in both the input and output directions?

I know the router would report each RTP stream twice-  for example when the stream from A --> B entered Gi0/1 and again when it exited gi0/2. 

Would this cause UCM to count the stream statistics twice, or is UCM intelligent enough to de-duplicate the data it receives from the router?

 

Answer: UCM is smart enough to de-duplicate the flows. UCM leverages our NFA Harvester code which already supports that.

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