3Com MSR 30, MSR 50 manual Fr dlci, Undo fr compression iphc, Undo fr dlci dlci-number

386CHAPTER 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.