R3303-HP HSR6800 Routers ACL and QoS Configuration Guide
135
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter FR class view.
fr class class-name N/A
3. Configure FIFO queue length
for the FR PVC.
fifo queue-length queue-length
Optional.
The default setting is 40.
Configuring FR fragmentation
The devices support end-to-end FRF.12 fragmentation.
On low-speed FR links, large data packets cause excessive delay. FR fragmentation can fragment large
FR packets into several small packets which can be transmitted on low-speed links with low delay.
When voice packets and data packets are transmitted simultaneously, large data packets occupy the
bandwidth for a long time. As a result, voice packets are delayed or even dropped, affecting voice
quality. The purpose of FR fragmentation configuration is to reduce delay for voice packets and
guarantee the real-time transmission of voice packets. With FR fragmentation configured, large data
packets are fragmented into small data fragments. Voice packets and the data fragments are sent
alternatively, so that voice packets can be timely and evenly processed and the delay for voice packets
is reduced.
Configuration restrictions and guidelines
• The configured FR fragmentation function takes effect after you associate the FR PVCs requiring FR
fragmentation with the FR class and enable FRTS on the FR PVCs.
• MFR interfaces do not support FRF.12 fragmentation. If the interfaces at both ends of a link are MFR
interfaces with FRF.12 fragmentation enabled, FRF.12 fragmentation does not take effect. Packets are
sent out from the local end without being fragmented and can be received by the remote end.
When pinging the remote end on the local end, you can get response from the remote end. If the
local MFR interface is connected to a normal FR interface (a serial interface with FR encapsulation
enabled), FRF.12 fragmentation does not work at the local end and packets are sent out from the
local end without being fragmented, however, FRF.12 fragmentation takes effect on the remote end.
Configuration procedure
To configure FR fragmentation:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter FR class view.
fr class class-name N/A
3. Enable FR
fragmentation.
fragment [ fragment-size ]
By default, FR fragmentation is
disabled.