Important: RoHC header compression is not applicable for SGSN and GGSN services.|
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Van Jacobsen (VJ) - The RFC 1144 (CTCP) header compression standard was developed by V. Jacobson in 1990. It is commonly known as VJ compression. It describes a basic method for compressing the headers of IPv4/TCP packets to improve performance over low speed serial links.
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RObust Header Compression (RoHC) - The RFC 3095 (RoHC) standard was developed in 2001. This standard can compress IP/UDP/RTP headers to just over one byte, even in the presence of severe channel impairments. This compression scheme can also compress IP/UDP and IP/ESP packet flows. RoHC is intended for use in wireless radio network equipment and mobile terminals to decrease header overhead, reduce packet loss, improve interactive response, and increase security over low-speed, noisy wireless links.
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Important: The RoHC is a licensed Cisco feature. A separate feature license may be required. Contact your Cisco account representative for detailed information on specific licensing requirements. For information on installing and verifying licenses, refer to the Managing License Keys section of the Software Management Operations chapter in the System Administration Guide.
Important: This section provides the minimum instruction set for configuring subscriber profile for header compression. For more information on commands that configure additional parameters and options, refer Subscriber Configuration Mode Commands chapter in Command Line Interface Reference .|
Step 1
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Step 2
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Step 3
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Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.
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context <ctxt_name>
subscriber name <subs_name>
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<ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
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<subs_name> is the name of the subscriber in the current context that you want to enable VJ IP header compression for.
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show subscriber configuration username subs_name
Important: This section provides the minimum instruction set for configuring subscriber profile for header compression. For more information on commands that configure additional parameters and options, refer Subscriber Configuration Mode Commands chapter in the Command Line Interface Reference.|
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Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.
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context <ctxt_name>
subscriber name <subs_name>
ip header-compression RoHC [ any [ mode { optimistic | reliable | unidirectional } ] | cid-mode { { large | small } [ marked-flows-only | max-cid | max-hdr <value> | mrru <value> ] } | marked flows-only | max-hdr <value> | mrru <value> | downlink | uplink ] }+
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<ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
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<subs_name> is the name of the subscriber in the current context that you want to enable RoHC header compression for.
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Refer to the Subscriber Configuration Mode Commands chapter in Command Line Interface Reference for more details on this command and its options.
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show subscriber configuration username subs_name
Important: If both RoHC and VJ header compression are specified, the optimum header compression algorithm for the type of data being transferred is used for data in the downlink direction.
Important: This section provides the minimum instruction set for configuring subscriber profile for header compression. For more information on commands that configure additional parameters and options, refer Subscriber Configuration Mode Commands chapter in th Command Line Interface Reference.|
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Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.
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context <ctxt_name>
subscriber name <subs_name>
ip header-compression vj RoHC [ any [ mode { optimistic | reliable | unidirectional } ] | cid-mode { { large | small } [ marked-flows-only | max-cid | max-hdr <value> | mrru <value> ] } | marked flows-only | max-hdr <value> | mrru <value> | downlink | uplink ] }+
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<ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
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<subs_name> is the name of the subscriber in the current context that you want to enable RoHC header compression for.
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show subscriber configuration username subs_name
Important: This section provides the minimum instruction set for configuring subscriber profile for header compression. For more information on commands that configure additional parameters and options, refer PDSN Service Configuration Mode Commands or HSGW Service Configuration Mode Commands chapter in Command Line Interface Reference.|
Step 1
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Enable header compression by applying the example configuration in the Enabling ROHC Header Compression with PDSN or Enabling ROHC Header Compression with HSGW section.
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Step 2
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Step 3
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Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.
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context <ctxt_name>
pdsn-service <svc_name>
cid-mode {large | small} max-cid integer
mrru <num_octets>
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<ctxt_name> is the system context in which PDSN service is configured and you wish to configure the service profile.
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<svc_name> is the name of the PDSN service in which you want to enable RoHC over SO67.
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Refer to the PDSN Service RoHC Configuration Mode Commands chapter in Command Line Interface Reference for more details on this command and its options.
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context <ctxt_name>
hsgw-service <svc_name>
cid-mode {large | small} max-cid integer
mrru <num_octets>
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<ctxt_name> is the system context in which HSGW service is configured and you wish to configure the service profile.
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<svc_name> is the name of the HSGW service in which you want to enable RoHC over SO67.
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Refer to the HSGW Service RoHC Configuration Mode Commands chapter in Command Line Interface Reference for more details on this command and its options.
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show configuration context ctxt_name
Important: This section provides the minimum instruction set for configuring subscriber profile for header compression. For more information on commands that configure additional parameters and options, refer Subscriber Configuration Mode Commands chapter in Command Line Interface Reference.|
Step a
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Configure RoHC profile by applying the example configuration in the Creating ROHC Profile for Subscriber using Compression Mode section using compression mode.
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Step b
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Step 2
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Step 3
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Step 4
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Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.
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RoHC-profile profile-name <RoHC_comp_profile_name>
rtp-sn-p <p_value>
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<RoHC_comp_profile_name> is the name of the RoHC profile with compression mode which you want to apply to a subscriber.
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System configured most of the parameters by default. For more information on other options and parameters and details, refer to the RoHC Profile Compression Configuration Mode Commands chapter in Command Line Interface Reference.
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RoHC-profile profile-name <RoHC_decomp_profile_name>
max-jitter-cd <dur_ms>
nak-limit <limit>
optimistic-mode-ack-limit <num_pkts>
piggyback-wait-time <dur_ms>
rtp-sn-p <p_value>
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<RoHC_profile_name> is the name of the RoHC profile with decompression mode which you want to apply to a subscriber.
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System configured most of the parameters by default. For more information on other options and parameters and details, refer to the RoHC Profile Decompression Configuration Mode Commands chapter in Command Line Interface Reference.
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context <ctxt_name>
subscriber name <subs_name>
RoHC-profile-name <RoHC_profile_name>
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<ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
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<subs_name> is the name of the subscriber in the current context that you want to enable RoHC header compression for.
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<RoHC_profile_name> is the name of the existing RoHC profile (created with compressed or decompressed mode) which you want to apply to a subscriber in the current context.
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Refer to the Subscriber Configuration Mode Commands chapter in Command Line Interface Reference for more details on this command and its options.
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show subscriber configuration username subs_name
Important: This section provides the minimum instruction set for configuring subscriber profile for header compression. For more information on commands that configure additional parameters and options, refer Subscriber Configuration Mode Commands chapter in Command Line Interface Reference.|
Step 1
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Step 2
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Step 3
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Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.
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context <ctxt_name>
subscriber name <subs_name>
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<ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
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<subs_name> is the name of the subscriber in the current context that you want to disable IP header compression for.
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show subscriber configuration username <subs_name>
Important: This section provides the minimum instruction set for configuring subscriber profile for header compression. For more information on commands that configure additional parameters and options, refer PDSN Service Configuration Mode Commands or HSGW Service Configuration Mode Commands chapter in Command Line Interface Reference.|
Step 1
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Step 2
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Step 3
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Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode command save configuration. For additional information on how to verify and save configuration files, refer to the System Administration Guide and the Command Line Interface Reference.
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context <ctxt_name>
pdsn/hsgw-service <svc_name>
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<ctxt_name> is the system context in which PDSN or HSGW service is configured and you wish to configure the service profile.
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<svc_name> is the name of the PDSN or HSGW service in which you want to disable RoHC over SO67.
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show configuration context <ctxt_name>
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For more information on these commands, refer to the Command Line Interface Reference.
