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rajmohan30
Beginner

Netflow - IWAN Setup

Hi,

Good morning !! Would someone help me to clarify the questions below ? Thank you...

 

My understanding is that the traffic on underlay would match the sum of traffic going via overlay. But when i analyzed the Netflow report in SolarWinds, it is not the case so i wanted to clarify whether my understating is correct. Let's take an example..

 

Physical INTERNET interface - Gi0/0/4 (Underlay interface) - Capacity is 500 Mb/s

 

Gi0/0/4 BW Usage – 300 Mb/s (Rx) at Specific time.

 

At the same time, the Netflow usage on each individual interface as below.

Tunn 1 (DMVPN)  – 2.9 Mb/s (Rx)

Tunn 10 (GRE to PROXY) – 104.7 Mb/s (Rx)

Gi0/0/4 (DIA Traffic) – 152.2 Mb/s (Rx)

so far Total = 260 Mb/s (apx) and the remaining around 40 Mb/s (300-260) is consumed by Guest

 

My question is that the underlay or physical interface (gi0/0/4) BW usage (300 Mb/s) does not match the Netflow traffic on the same interface whereas it shows only 152.2 Mb/s., Doesn't it not sum up the overlay traffic of DMVPN/GRE tunnel and show the aggregate value under physical interface netflow report, if not may i know why  ?

 

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