How to calculate Bandwidth utilization

[kumardipu84]

Hello Everyone,

I want to know that how port utilization is calculated on Router if we have below Tx and Rx Load. Can I combine both Tx and Rx percentile while calculate utilization.

Note :- We have 2gbps P2P link. below example calculated with 2 Gbps link.

Example :- Tx=185/255=  72.54% of the total bandwidth.

                  Rx=66/255= 25.88% of the total Bandwidth.

If we combine both then it will be 97% of the total bandwidth. 

does it impact the performance. Please advice me how to calculate.

Thank you in advance.

[balaji.bandi]

It all depends on interface, example for the 100MB full Duplex.

TXLOAD + RXLOAD / 510 = is the results. ( as per yours 185+66/510 = 49% thinking this is 100MB Interface)

[kumardipu84]

Thank you Balaji for your quick response and got some knowledge from you.

I have 1000Mb full duplex.

But here Tx Load = 185/255. Means transmission traffic is more than 70%, so, I want to know whether transmission traffic impact out performance? 

[balaji.bandi]

Personally i would give always head room to interface not to saturate the link - if i cross near by 80% and link saturation, the performance will be degrading depending on application - this time suggest to upgrade the link capacity and upgrading the port to next level.

Also possible apply QoS policies for better utilization.

[Richard Burts]

Unless you are dealing with a half duplex interface then Tx and Rx operate independently and it is a mistake to combine them to figure out port utilization.

To answer the broader question: as interface utilization gets greater there is generally an impact on performance. It is difficult to identify a percentage where the impact is large enough to be a problem. But certainly before any interface got close to 90 percent I would be looking for ways to reduce its utilization.

HTH

Rick

[kumardipu84]

Thank you Richard. 

I hope, I will get this type of support in future also.

Thank you again.

[Richard Burts]

You are quite welcome. These communities are excellent places to ask questions and to learn about networking. I hope to see you continue to be active in the community.

HTH

Rick

[kumardipu84]

Hello Balaji,

Good morning

Thank you for your reply. Now  my doubt is clear. 

[balaji.bandi]

if it resolved can you make it as resolved please.

[mellalBrahim]

hi @balaji.bandi , 

i want to mesure my Bandwidth utilization, for my case we used i leased link with 20 Mbps, 

and the  txload 47/255, rxload 254/255.

how can i calculate my bandwitch utlization, 

how can i optimize this bandwitch, if i apply the QOS this would resoulve my issue.

thanks in advance.

[Richard Burts]

There is a significant difference between your transmit level and your receive level. Would I be correct in assuming that your transmit traffic is mostly requests for data and your receive traffic is mostly receiving the requested data? I am not sure that QOS will be very effective in dealing with this. Is there a possibility of increasing the capacity of this link?

[balaji.bandi]

QoS may resolve the issue, depends how you like to apply. Queing always helps (when the bandwidth is limitation).