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This Question is Not Answered 1 Correct Answer available (4 pts) 1 Helpful Answer available (2 pts)
5987 Views 3 Replies Latest reply: Oct 25, 2011 3:43 AM by Paul Stewart - CCIE Security, CCSI RSS

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Does MTU size affect throughput / bandwidth / speed

Oct 24, 2011 10:11 AM

Nikhil 38 posts since
Sep 2, 2008


We had an issue of a customer whose last-mile media supports bandwidth of 20 Mbps which he should get. But upon actual testing, the client can achieve only an effective throughput of 4 Mbps. Some of engineers are wondering that it has something to do with the MTU on the path.


PE is a cisco 7206 router and lastmile media is a fiber restricted to 20 Mbps. We have also removed any rate-limitting configuration and do no see any bottlenecks.


The CE device is a non-cisco modem able to handle 24 Mbps traffic, and even this device has been replaced.


Whether MTU has anything to do in this scenario. Any clues on this ?

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