Fr Dlci - H3C MSR 20-20 Command Reference Manual

386 C 22: F
HAPTER RAME
View
Parameter
Description
Example

fr dlci

Syntax
View
Parameter
Description
R C C
ELAY ONFIGURATION OMMANDS
undo fr compression iphc
Frame relay interface view
None
Use the fr compression iphc
compression.
Use the
undo fr compression iphc
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.
# 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 dlci-number
undo fr dlci [ dlci-number ]
Interface view
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.
Use the command to configure the virtual circuit for frame relay interface
fr dlci
and enter the corresponding virtual circuit view on the frame relay.
command to enable FRF.20 (FRF.20 IPHC)
command to disable the function.