The Cisco 36x0 series and other vendor VFRADs incorporate fragmentation schemes to improve performance. Data packets are divided into small fragments, allowing higher priority voice packets to receive the right-of-way without waiting for the end of long data transmissions. The remaining data packets in the data stream are momentarily buffered until the voice transmission gets through.
Fragmentation increases the number of data frames, in turn increasing the number of flags and headers, which in turn increases overhead and reduces bandwidth efficiency. One method of working around fragmentation issues for data transmission is to increase the size of the MTU. There are some drawbacks in that changing the MTU of the data packets prior to frame encapsulation can have adverse effects on the applications. It is best to open a case with the Cisco TAC for assistance if this is the course of action being considered.
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