3 Replies Latest reply: Oct 25, 2011 3:43 AM by Paul Stewart - CCIE Security RSS

    Does MTU size affect throughput / bandwidth / speed


      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 ?