QoS mechanisms - LFI (forward link fragmentation interactive)

Case Study:
causing the problem:
due to slow links and large data packets cause too much delay, jitter link utilization.
serialization delays serialization delay

Interleaving fragmentation and Link
LFI reduce latency and low jitter data packets, such as VoIP traffic.

Configuration Procedure:
1. Enable MLP on an interface (Interface multilink group)
2. Link Interface is enabled on multiple cross-MLP
3. Maximum fragment size is specified by setting the maximum delay in a multi-link interface

Open MLP
configuration sub-frame interactive sheet
configuration fragments ms maximum delay
router delay calculated from the maximum segment size and the maximum segment interface bandwidth
fragment size = maximum segment interface bandwidth * delay
default maximum delay of 30 msec segments

Configuration:

R1#show run int s1/1
Building configuration...

Current configuration : 123 bytes
!
interface Serial1/1
 no ip address
 encapsulation ppp
 serial restart-delay 0
 ppp multilink
 ppp multilink group 1
end

R1#show run int s1/0
Building configuration...

Current configuration : 123 bytes
!
interface Serial1/0
 no ip address
 encapsulation ppp
 serial restart-delay 0
 ppp multilink
 ppp multilink group 1
end

Multlink then enters the IP address configuration, link bundling

interface Multilink1
 ip address 12.1.1.1 255.255.255.0
 ppp multilink
 ppp multilink group 1
end

R1(config-if)#ppp multilink interleave 
R1(config-if)#ppp multilink fragment ?
  delay    Specify the maximum delay for each fragment
  /数据包延时大于设置值，分片
  disable  Suppress multilink fragmentation when possible
  /关闭分片
  maximum  Specify the maximum number of fragments per transmitted packet
  /指定分片数
  size     Specify the maximum size of a multilink fragment
  /数据包大小大于设置值，分片