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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR
ip tcp header-compression
Usage Guidelines You can compress the headers of your TCP/IP packets in order to reduce the size of your packets. TCP
header compression is supported on serial lines using Frame Relay, HDLC, or PPP encapsulation. You
must enable compression on both ends of a serial connection. Compressing the TCP header can speed
up Telnet connections dramatically.
In general, TCP header compression is advantageous when your traffic consists of many small packets,
not for traffic that consists of large packets. Transaction processing (usually using terminals) tends to
use small packets and file transfers use large packets. This feature only compresses the TCP header, so
it has no effect on User Datagram Protocol (UDP) packets or other headers.
passive Keyword
By default, the ip tcp header-compression command compresses outgoing TCP traffic. This command
includes an optional passive keyword. If you specify the passive keyword, outgoing TCP traffic is
compressed only if incoming TCP traffic on the same interface is compressed. If you do not specify the
passive keyword, all TCP traffic is compressed.
For PPP interfaces, the passive keyword is ignored. PPP interfaces negotiate the use of header
compression, regardless of whether the passive keyword is specified. Therefore, on PPP interfaces, the
passive keyword is replaced by the IPHC format, the default format for PPP interfaces.
iphc-format Keyword
This command includes the iphc-format keyword. The iphc-format keyword indicates the type of
header compression that will be used. For PPP and HDLC interfaces, when the iphc-format keyword is
specified, Real-Time Protocol (RTP) header compression is also enabled. For this reason, the ip rtp
header-compression command appears in the output of the show running-config command. Because
both TCP and RTP header compression are enabled, both TCP and UDP packets are compressed.
Note For Frame Relay interfaces, the iphc-format keyword is not available.
ietf-format Keyword
This command includes the ietf-format keyword. The ietf-format keyword indicates the type of header
compression that will be used. For HDLC interfaces, the ietf-format keyword compresses only TCP
packets. For PPP interfaces, when the ietf-format keyword is specified, RTP header compression is also
enabled. For this reason, the ip rtp header-compression command appears in the output of the show
running-config command. Because both TCP and RTP header compression are enabled, both TCP and
UDP packets are compressed.
Note For Frame Relay interfaces, the ietf-format keyword is not available.
Examples The following example sets the first serial interface for header compression with a maximum of 10 cache
entries:
Router(config)# interface t1 0/1
Router(config-if)# ip tcp header-compression
Router(config-if)# ip tcp compression-connections 10
- Release 15.1(3)MR 1
- Configuring a Policy Map 14
- Restrictions 15
- Policy Map Configuration Mode 27
- Class Characteristics 27
- Predefined Default Class 27
- Tail Drop or WRED 27
- Fragments 28
- If ID Choice Is Anything Else 72
- Unique Device Identifier 73
- Cisco HWIC-4SHDSL 88
- SNAP Encapsulation Example 96
- OL-26895-01 105
- • n393—1 to 10. Default is 4 133
- • proxy-register 187
- • list access-list 187
- • route-map map-name 187
- Support for Serial Lines 194
- Syntax Description 195
- Keepalive Time Interval 203
- Line Failure 203
- Dropped Packets 203
- DSCP Values 226
- Match Packets on DSCP Values 227
- • match access-group 231
- • match input-interface 231
- • match mpls experimental 231
- • match protocol 231
- Precedence Values and Names 233
- IPv4-Specific Traffic Match 233
- IPv6-Specific Traffic Match 234
- Support Restrictions 237
- ATM Mode Example 247
- CAS Mode Example 247
- Router(config)# no mpls ip 250
- Release 12.2(33)SRB 259
- • QL-PRC 275
- • QL-SSU-A 275
- • QL-SSU-B 275
- • QL-SEC 275
- • QL-DNU 275
- All Supported Platforms 303
- Hierarchical Policy Maps 304
- How Bandwidth Is Calculated 305
- • conform-action is transmit 311
- • exceed-action is drop 311
- • violate-action is drop 311
- Token Buckets 314
- Updating Token Buckets 315
- Marking Traffic 315
- Two-Rate Policing 316
- Syntax for Percent 318
- Command Application 332
- • Data encapsulation type 334
- • Control protocol 334
- • 4—1 packet every 16 seconds 336
- • 3—1 packet every 8 seconds 336
- • 2—1 packet every 4 seconds 336
- • 1—1 packet every 2 seconds 336
- • 0—1 packet every second 336
- Command Description 341
- Router(config)# exit 358
- Weighted Fair Queueing 366
- • Control network loops 376
- • Handle link failures 376
- • Improve convergence time 376
- the following adapters: the 409
- to specify the “from-field” 412
- • EF (expedited forwarding) 420
- Precedence Value and Queueing 421
- 2. ip tos reflect 429
- 3. ip tos tos-value 429
- Command Compatibility 440
- Bit Settings 440
- Precedence Value 441
- Committed Information Rate 449
- IMA Group 456
- M-PAIR Group 456
- 1-PAIR and 2-PAIR Group 456
- DSL Group with 1 Pair 458
- DSL Group with 2 Pairs 458
- DSL Group with 3 Pairs 458
- DSL Group with 4 Pairs 458
- • Interface name and number 471
- • Identifier (group ID) 475
- ADSL: Example 490
- • Domain name 495
- • Domain index 495
- • Domain level 495
- Field Description 504
- Reliability Errors 524
- Protocol Errors 524
- UNI Id Identifier of the UNI 526
- EVC Id Identifier of the EVC 526
- • Local and remote OAM mode 528
- • Remote platform identity 528
- • Remote loopback events 531
- Traffic Policing: Example 583
- Tunnel Marking: Example 588
- ATM Shared Port Adapter 590
- (continued) 595
- Policing 597
- Policing and Shaping 599
- Traffic Shaping: Example 600
- UDP encapsulation 613
- • priority is 128 647
- Router(config-if)# 648
- • Up to 2 queues 670
- • Up to 2 interfaces 670
- • 1 queue and 1 interface 670
- Router(config-if)# switchport 672
- GRE Tunneling Example 693
- Peak Value 705
- Average Value 705
- Burst Value 705
- Activating the Primary Member 709
- Activating the Backup Member: 709
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