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ip rtp header-compression

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Appendix A Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference ip rtp header-compression ip rtp header-compression To enable Real-Time Transport Protocol (RTP) header compression, use the ip rtp header-compression command in interface configuration mode. To disable RTP header compression, use the no form of this command. ip rtp header-compression [passive | iphc-format | ietf-format] [periodic-refresh] no ip rtp header-compression [passive | iphc-format | ietf-format] [periodic-refresh] Syntax Description passive iphc-format ietf-format periodic-refresh (Optional) Compresses outgoing RTP packets only if incoming RTP packets on the same interface are compressed. If you do not specify the passive keyword, all RTP packets are compressed. (Optional) Indicates that the IP Header Compression (IPHC) format of header compression will be used. (Optional) Indicates that the Internet Engineering Task Force (IETF) format of header compression will be used. (Optional) Indicates that the compressed IP header will be refreshed periodically. Defaults Disabled For PPP interfaces, the default format for header compression is the IPHC format. For High-Level Data Link Control (HDLC) and Frame Relay interfaces, the default format for header compression is the original proprietary Cisco format. The maximum number of compression connections for the proprietary Cisco format is 256. Command Modes Interface configuration Command History Release 11.3 12.0 12.3(2)T 12.3(4)T 12.2(25)S 12.4(2)MR Modification This command was introduced. This command was incorporated into Cisco IOS Release 12.0. This command was modified to include the iphc-format keyword. This command was incorporated into Cisco IOS Release 12.3(2)T. This command was modified to include the periodic-refresh keyword. This command was modified to include the ietf-format keyword. This command was incorporated. This command was incorporated. Usage Guidelines You can compress IP/UDP/RTP headers to reduce the size of your packets. Compressing headers is especially useful for RTP because RTP payload size can be as small as 20 bytes, and the uncompressed header is 40 bytes. OL-15667-03 Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide A-41

Section	Page
Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide	1
Contents	3
Preface	7
Overview of the Cisco 3825 Mobile Wireless Edge Router	11
Introduction	11
RAN-Optimization Implementation	12
Cisco Abis and Iub Optimization over IP Implementation	12
Cisco GSM Abis Optimization over IP	13
Cisco Pseudowire Emulation Edge-to-Edge (PWE3)	14
Cisco Iub Optimization over IP	15
Intelligent Cell Site IP Services	15
Cell Site Points-of-Presence (POPs)	15
Cisco IOS Software Features	16
Software features for the RAN-O Implementation	16
Software Features	17
Redundancy Support	17
HSRP	17
Configuration Statements for CISCO-IP-RAN-BACKHAUL-MIB	18
MIB Support	20
Limitations and Restrictions	21
RAN-O Implementation Limitations and Restrictions	22
Hardware not Supported on the Cisco 3825 Router	22
UMTS Iub and GSM Abis Implementation Limitations and Restrictions	22
Hardware not Supported for UMTS Iub	22
Hardware not Supported for GSM Abis	22
New Features in Cisco IOS Release 12.4(16)MR2	23
Keyword ignore-vpi-vci Added to xconnect Command	23
New Features in Cisco IOS Release 12.4(16)MR1	23
Emulation of TDM Circuit via MPLS/IP (PWE3/TDM)	24
Structure-agnostic TDM over Packet (SAToP)	26
Structure-aware TDM CESoPSN	26
Transportation of ATM Service via MPLS/IP (PWE3/ATM)	27
Transparent Cell Transport Service/ATM Port Mode	27
ATM N-to-One VCC Cell Mode	27
ATM AAL5 CPCS-SDU Mode	28
ATM One-to-One VCC Cell Mode	28
Cell Packing	29
PVC Mapping	29
Transportation of ATM Service via L2TPv3	30
ATM Port Cell Relay Service	30
ATM VCC Cell Relay Service	30
ATM AAL5-SDU Mode	31
Cell Packing	31
PVC Mapping	32
Asymmetric PWE3	32
Ethernet over MPLS	33
VLAN Mode	33
Port Mode	33
PWE3 over MLPPP	34
PWE3 Redundancy	34
TDM PWE3 Redundancy	35
ATM PWE3 Redundancy	35
Ethernet PWE3 Redundancy	35
Maximum Number of Supported ATM Ports	36
ATM Cell Switching	36
New Features in Cisco IOS Release 12.4(16)MR	37
GSMmux-Global System for Mobile Communication (GSM) Abis Optimization over IP	37
UMTSmux-Universal Mobile Telecommunication System (UMTS) Iub Optimization over IP	37
UMTS Congestion Management Control	38
Inverse Multiplexing over ATM (IMA)	39
Permanent Virtual Circuit (PVC) Routing	40
Behavior Changes	42
UMTS QoS	43
Cisco IOS Software Basics	47
Getting Help	47
Understanding Command Modes	48
Undoing a Command or Feature	49
Saving Configuration Changes	49
Where to Go Next	49
First-Time Configuration	51
Understanding Boot Images	51
Understanding the Cisco 3825 Router Interface Numbering	51
Slot and Port Numbering	52
Setup Command Facility	53
Before Starting Your Router	53
Using the Setup Command Facility	54
Configuring Global Parameters	54
Completing the Configuration	57
Configuring the Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line Interface	59
Before You Begin	60
Verifying the Version of Cisco IOS Software	60
Clocking Requirements for Cisco 3825 Router	60
Clock-Related Commands	61
Network-Clock-Participate Command	61
Network-Clock-Select Command	61
Clock Source Command	62
Example Configurations	63
Show Controller Command	63
Configuration Sequence	64
Summary of Steps	64
Configuring the Hostname and Password	64
Verifying the Hostname and Password	65
Configuring Gigabit Ethernet Interfaces	66
Configuring the GE Interface IP Address	66
Setting the Speed and Duplex Mode	66
Enabling the GE Interface	67
Configuring the Backhaul Links	67
Configuring the Card Type for the Cisco 2-port T1/E1-RAN	68
Configuring E1 Controllers	69
Configuring T1 Controllers	70
Configuring Network Clocking Support	72
Configuring Multilink Backhaul Interface	73
Creating a Multilink Bundle	73
Handling PFC and ACFC	74
Configuring PFC	74
Configuring ACFC	75
Enable Multilink and Identify the Multilink Interface	75
Enable Real-Time Transport Protocol (RTP) Header-Compression	76
Configuring the PPP Backhaul Interfaces	77
Extended Availability Drop and Insert (EADI)	78
Configuring GSM-Abis Links	78
Configuring UMTS Links	82
Configuring Redundancy	86
Redundant Cisco 3825 Routers	86
Standalone Cisco 3825 Router	91
Configuring for SNMP Support	91
Configuring Inverse Multiplexing over ATM (IMA)	95
Configuring PVC Routing (HSDPA Offload)	99
Configuring UMTS QoS	104
Creating a Class Map	105
Creating a Policy Map	105
Specify the Location of the Interface	106
Assigning a QoS Boilerplate to an Interface	109
Configuring UMTS Congestion Management Control	113
Configuring Satellite Support	116
Configuring Graceful Degradation	117
Saving Configuration Changes	119
Example Configurations	119
BTS/Node-B Configuration	119
BSC/RNC Configuration	123
Monitoring and Managing the Cisco 3825 Router	127
Enabling the Cisco 3825 Router for Remote Network Management	127
Show Commands for Monitoring the Cisco 3825 Router	129
Where to Go Next	131
Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference	133
Configuration Examples	269
Overview	269
Asymmetric PWE3 Configuration	270
Ethernet over MPLS-VLAN and Port Mode Configuration	283
PWE3 over MLPPP Configuration	289
PWE3 Redundancy Configuration	298
TDM over MPLS Configuration	304
ATM over MPLS Configurations	309
ATM over L2TPv3 Configuration	316
GSM Only Configuration	323
UMTS Only Configuration without IMA	327
Combined GSM and UMTS Configuration	331
GSM and UMTS with IMA Configuration	336
GSM and UMTS with IMA and PVC Routing (HSDPA Offload) Configuration	342
GSM Only Configuration via Satellite	348
GSM Congestion Management	351
UMTS Congestion Management	352

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A-41

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

OL-15667-03

Appendix A

Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference

ip rtp header-compression

To enable Real-Time Transport Protocol (RTP) header compression, use the

ip rtp header-compression

command in interface configuration mode. To disable RTP header compression, use the

form of this

command.

ip rtp header-compression

[

passive

iphc-format

ietf-format

] [

periodic-refresh

]

no ip rtp header-compression

[

passive

iphc-format

ietf-format

] [

periodic-refresh

]

Syntax Description

Defaults

Disabled

For PPP interfaces, the default format for header compression is the IPHC format.

For High-Level Data Link Control (HDLC) and Frame Relay interfaces, the default format for header

compression is the original proprietary Cisco format. The maximum number of compression connections

for the proprietary Cisco format is 256.

Command Modes

Interface configuration

Command History

Usage Guidelines

You can compress IP/UDP/RTP headers to reduce the size of your packets. Compressing headers is

especially useful for RTP because RTP payload size can be as small as 20 bytes, and the uncompressed

header is 40 bytes.

passive

(Optional) Compresses outgoing RTP packets only if incoming RTP packets on

the same interface are compressed. If you do not specify the

passive

keyword, all

RTP packets are compressed.

iphc-format

(Optional) Indicates that the IP Header Compression (IPHC) format of header

compression will be used.

ietf-format

(Optional) Indicates that the Internet Engineering Task Force (IETF) format of

header compression will be used.

periodic-refresh

(Optional) Indicates that the compressed IP header will be refreshed periodically.

Release

Modification

11.3

This command was introduced.

12.0

This command was incorporated into Cisco IOS Release 12.0. This command

was modified to include the

iphc-format

keyword.

12.3(2)T

This command was incorporated into Cisco IOS Release 12.3(2)T. This

command was modified to include the

periodic-refresh

keyword.

12.3(4)T

This command was modified to include the

ietf-format

keyword.

12.2(25)S

This command was incorporated.

12.4(2)MR

This command was incorporated.