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Parameter None

Description Use the ip tcp vjcompress command to enable a PPP interface to compress the VJ TCP header.

Use the undo ip tcp vjcompress command to disable the PPP interface to compress the VJ TCP header.

By default, the VJ TCP header compression is disabled on PPP interfaces.

If a PPP interface is enabled to perform VJ TCP header compression, so should the interface at the opposite end.

Example # Enable VJ TCP header compression on interface Serial 1/0.

<Sysname> system-view

[Sysname] interface serial 1/0

[Sysname-Serial1/0] ip tcp vjcompress

ppp compression iphc

Syntax ppp compression iphc [ nonstandard ]

undo ppp compression iphc

View Interface view

Parameter nonstandard: Nonstandard encapsulation mode.

Description Use the ppp compression iphc command to enable IP header (TCP header and RTP header mainly) compression on the interface.

Use the undo ppp compression iphc command to disable IP header compression.

By default, TCP header compression and RTP header compression are disabled.

Once IP header compression is enabled, the header compression for TCP packets used to establish RTP sessions is also enabled. When IP header compression is disabled, the header compression for TCP packets used to establish RTP sessions is also disabled.

To enable IP header compression, you need to execute the ppp compression iphc command on both ends of the link.

Note that:

If the configuration is applied on VT and Dialer interfaces, ISDN and asynchronous dialer interfaces, the configuration takes effect only after you shutdown and then bring up the interfaces.

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