R0106-HP MSR Router Series Layer 2 - WAN Configuration Guide(V7)
14
Ste
p
Command
Remarks
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable PPP accounting.
ppp account-statistics enable [ acl
{ acl-number | name acl-name } ]
By default, PPP accounting is
disabled.
Support for the acl keyword
depends on the device model.
Enabling IP header compression
IP header compression (IPHC) compresses packet headers to speed up packet transmission. IPHC is often
used for voice communications over low-speed links.
IPHC provides the following compression functions:
• RTP header compression—Compresses the IP header, UDP header, and RTP header of an RTP
packet, which have a total length of 40 bytes.
• TCP header compression—Compresses the IP header and TCP header of a TCP packet, which have
a total length of 40 bytes.
To use IPHC, you must enable it on both sides of a PPP link.
Enabling or disabling IPHC on a VT, dialer, or ISDN interface does not immediately take effect. You must
execute the shutdown and undo shutdown commands on the interface or the bound physical interface
to apply the new setting.
After you enable IPHC, you can configure the maximum number of connections for RTP or TCP header
compression. The configuration takes effect after you execute the shutdown and undo shutdown
command on the interface. The configuration is removed after IPHC is disabled.
To configure IPHC:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable IP header compression.
ppp compression iphc
enable [ nonstandard ]
By default, IP header compression
is disabled.
The nonstandard option must be
specified when the device
communicates with a non-HP
device.
4. Set the maximum number of
connections for which an interface
can perform RTP header
compression.
ppp compression iphc
rtp-connections number
The default setting is 16.
5. Set the maximum number of
connections for which the interface
can perform TCP header
compression.
ppp compression iphc
tcp-connections number
The default setting is 16.