Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 1 PPP and MP Configuration Commands
3Com Corporation
1-26
The compression command can take effect on a link only when it is configured at both
ends of the link.
The configuration will take effect only when the shutdown and undo shutdown
operations are performed on the interface. If the configuration is applied on MP, the
shutdown and undo shutdown operations should be performed on all the MPs.
Related command: ppp compression iphc rtc-connection, ppp compression iphc
tcp-connections.
Example
# Enable TCP header compression and RTP header compression on interface
serial0/0/0.
[3Com-serial0/0/0] ppp compression iphc
1.2.8 ppp compression iphc rtp-connections
Syntax
ppp compression iphc rtp-connections number
undo ppp compression iphc rtp-connections
View
Interface view
Parameter
number: The maximum connection number (from 3 to 256) of IP Header Compression
mode on the interface. By default, the number is 16.
Description
Use the ppp compression iphc rtp-connections command to designate the
connections number of IP Header Compression allowed on one interface.
Use the undo ppp compression iphc rtp-connections command to cancel the
configuration and restore the default value.
RTP is connection oriented; the number of RTP connections that a link can
accommodate is relatively large. The use of compression however requires the router
to maintain some information for each connection when compressing headers. To
restrict the memory load generated by compression, you can use the ppp
compression iphc rtp-connections command to limit the number of
compression-enabled RTP connections to three for example. The packets on the fourth
RTP connection are not compressed as a result.
The configuration will take effect after commands shutdown and undo shutdown
have been executed on the interface. When configuring MP, commands shutdown and
undo shutdown must be executed on all MP member interfaces.