R3303-HP 6600/HSR6600 Routers Layer 2 - WAN Configuration Guide

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LFI reduces delays and jitters on low-speed links by fragmenting large packets into small fragments and
transmitting them along with small packets. The fragmented datagrams are reassembled at the
destination.
Figure 11 illu
strates the process of LFI. When large packets and small voice packets arrive at an interface
that is enabled with WFQ at the same time, the large packets are fragmented into small fragments, which
are then added to the queues along with the voice packets.
Figure 11 LFI
To configure LFI:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter VT interface view or MP-group
interface view.
• interface
virtual-template number
• interface mp-group
mp-number
N/A
3. Enable LFI.
ip tcp vjcompress By default, LFI is disabled.
4. Set the maximum delay of
transmitting an LFI fragment or the
maximum size (in bytes) of LFI
fragments.
• ppp mp lfi
delay-per-frag time
• ppp mp lfi size-per-frag
size
Use either command.
The default maximum delay of
transmitting an LFI fragment is 10
ms, and the default maximum size
of LFI fragments depends on the
configuration of the ppp mp lfi
delay-per-frag command.
Displaying and maintaining PPP and MP
Task Command Remarks
Display PPP user binding
information.
display ppp user bind [ virtual-template
number ] [ | { begin | exclude | include }
regular-expression ]
Available in any view.
Voice packet
Large packet
Output queue
WFQ
Traffic
classifying
Fragmentation
WFQ