Link Fragmentation and Interleaving

Without link fragmentation and interleaving, time-sensitive voice traffic can be delayed behind long, non-time-sensitive data packets.

Link fragmentation breaks long data packets apart and interleaves time-sensitive packets so that the time-sensitive packets are not delayed.

Interactive traffic, such as Telnet and VoIP, is susceptible to increased latency and jitter when the network processes large packets, such as LAN-to-LAN FTP Telnet transfers, traversing a WAN link. This susceptibility increases as the traffic is queued on slower links.

LFI can reduce delay and jitter on slower-speed links by breaking up large datagrams and interleaving low-delay traffic packets with the resulting smaller packets.

LFI would typically be used on WAN links between sites to ensure minimal delay for voice and video traffic.

Note LFI technology is covered in detail in the "Link Efficiency Mechanisms" module in this course.

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