4000 Router Series Layer 2 - WAN Configuration Guide

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Configuring LFI

Real-time packets such as Telnet and VoIP packets might be blocked or delayed on a low-speed interface

that is processing lots of large packets.

To reduces delays and jitters on low-speed links, LFI fragments large packets into small fragments. The

fragments are reassembled at the destination.

Figure 2 illu

strates the LFI process. When large packets and small voice packets arrive at an interface that

is enabled with WFQ, LFI fragments the large packets into small fragments, and add the fragments to the

queues along with the voice packets.

Figure 2 LFI

To configure LFI:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enter MP-group interface view.

interface mp-group

mp-number

N/A

3. Enable LFI.

ppp mp lfi enable

By default, LFI is disabled.

Disabling LFI also removes the

user-configured settings of the

maximum LFI fragment delay and

size.

4. Set the maximum LFI fragment

transmission delay and the

maximum LFI fragment size (in

bytes).

• ppp mp lfi

delay-per-frag time

• ppp mp lfi size-per-frag

size

Use either command.

The default maximum LFI fragment

transmission delay is 10 ms, and

the maximum LFI fragment size

depends on the configuration of the

ppp mp lfi delay-per-frag

command.

Displaying and maintaining PPP and MP

Execute display commands in any view and reset commands in user view.

Voice packet

Large packet

Output queue

WFQ

Traffic

classifying

Fragmentation

WFQ