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386 CHAPTER 22: FRAME RELAY CONFIGURATION COMMANDS
undo fr compression iphc
View Frame relay interface view
Parameter None
Description Use the
fr compression iphc command to enable FRF.20 (FRF.20 IPHC)
compression.
Use the
undo fr compression iphc command to disable the function.
By default, the frame relay compression function is disabled.
The system supports frame relay FRF.20 IP Header Compression (IPHC) function
that compresses IP header. This technology is used to transmit voice messages so
as to save bandwidth, and data is transmitted with great efficiency and speed.
Messages are divided into control messages and data messages according to
FRF.20. An control message is used for state negotiation between the two sides
that have compression protocol enabled of a DLCI connection. FRF.20 data
messages are exchanged only after the negotiation succeeds. The negotiation fails
if the number of FRF.20 control messages sent exceeds. In this case, compression
configuration cannot take effect. This command is only valid for RTP messages and
TCP ACK messages.
You can specify FRF.20 (FRF.20 IPHC) compression function using either the fr
compression iphc command or configuring static address mapping.
For detailed information about configuring static address mapping, refer to “fr
map ip” on page 396.
Example # Configure the frame relay interface Serial 2/0 to adopt FRF.20 compression.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] fr compression iphc
fr dlci
Syntax fr dlci dlci-number
undo fr dlci [ dlci-number ]
View Interface view
Parameter dlci-number: Virtual circuit number allocated for the frame relay interface, in the
range 16 to 1007. The range 0 to 15 and 1008 to 1023 are reserved for special
purposes.
Description Use the
fr dlci command to configure the virtual circuit for frame relay interface
and enter the corresponding virtual circuit view on the frame relay.