ip tcp header-compression

Last Updated : Aug 28, 2026 |
Enables TCP header compression on the current interface. Use no ip tcp header-compression to disable both RTP and TCP compression on the current interface.
Prolog information

Syntax

[no] ip tcp header-compression [iphc-format]

Parameters

Parameter
Description
Possible Values
Default Value
iphc-format
Keyword specifying the header compression format.
  • For a PPP or Dialer interface, specifying the iphc-format parameter activates IPHC compression, while not specifying the command activates VJ compression (unless IPHC compression is already active)
  • For a Frame Relay IETF interface, you must specify the iphc-format parameter in order to activate compression. IPHC compression is then activated.
  • For a Frame Relay non-IETF interface, the ip tcp header-compression command activates VJ compression. The iphc-format parameter is not accessible since IPHC compression is not supported.

User level

read-write

Context

interface:Dialer (L2, L2-L3, L3)

Example

To enable TCP header compression on Dialer interface 1:
Gxxx-001(if:Dialer:1) ip tcp header-compression