• 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.
• 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.Important: Use of RoHC requires that a valid RoHC license key be installed. Contact your local Sales or Support representative for information on how to obtain a license.
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
Step 2
Step 3 Save your configuration as described in the Saving Your Configuration chapter.context <ctxt_name>subscriber name <subs_name>
• <ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
• <subs_name> is the name of the subscriber in the current context that you want to enable VJ IP header compression for.show subscriber configuration username subs_nameImportant: Use of RoHC requires that a valid license key be installed. Contact your local Sales or Support representative for information on how to obtain a license.
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.
Step 1
Step 2
Step 3 Save your configuration as described in the Saving Your Configuration chapter.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 ] }+
• <ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
• <subs_name> is the name of the subscriber in the current context that you want to enable RoHC header compression for.show subscriber configuration username subs_nameImportant: 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: Use of RoHC requires that a valid license key be installed. Contact your local Sales or Support representative for information on how to obtain a license.
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.
Step 1
Step 2
Step 3 Save your configuration as described in the Saving Your Configuration chapter.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 ] }+
• <ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
• <subs_name> is the name of the subscriber in the current context that you want to enable RoHC header compression for.show subscriber configuration username subs_nameImportant: 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 chapter in Command Line Interface Reference.
Step 1
Step 2
Step 3 Save your configuration as described in the Saving Your Configuration chapter.context <ctxt_name>pdsn-service <svc_name>cid-mode {large | small} max-cid integermrru <num_octets>
• <ctxt_name> is the system context in which PDSN service is configured and you wish to configure the service profile.
• <svc_name> is the name of the PDSN service in which you want to enable RoHC over SO67.show configuration context ctxt_nameImportant: Use of RoHC requires that a valid license key be installed. Contact your local Sales or Support representative for information on how to obtain a license.
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 Configure RoHC profile by applying the example configuration in the Creating ROHC Profile for Subscriber using Compression Mode section using compression mode.
Step b
Step 2
Step 3
Step 4 Save your configuration as described in the Saving Your Configuration chapter.RoHC-profile profile-name <RoHC_comp_profile_name>rtp-sn-p <p_value>
• <RoHC_comp_profile_name> is the name of the RoHC profile with compression mode which you want to apply to a subscriber.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>
• <RoHC_profile_name> is the name of the RoHC profile with decompression mode which you want to apply to a subscriber.context <ctxt_name>subscriber name <subs_name>RoHC-profile-name <RoHC_profile_name>
• <ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
• <subs_name> is the name of the subscriber in the current context that you want to enable RoHC header compression for.
• <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.show subscriber configuration username subs_nameImportant: 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
Step 2
Step 3 Save your configuration as described in the Saving Your Configuration chapter.context <ctxt_name>subscriber name <subs_name>
• <ctxt_name> is the system context in which you wish to configure the subscriber profile. Typically this is an AAA context.
• <subs_name> is the name of the subscriber in the current context that you want to disable IP header compression for.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 chapter in Command Line Interface Reference.
Step 1
Step 2
Step 3 Save your configuration as described in the Saving Your Configuration chapter.context <ctxt_name>pdsn-service <svc_name>
• <ctxt_name> is the system context in which PDSN service is configured and you wish to configure the service profile.
• <svc_name> is the name of the PDSN service in which you want to disable RoHC over SO67.show configuration context <ctxt_name>
• For more information on these commands, refer to the Command Line Interface Reference.
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