Enabling Ppp Link Quality Monitoring - HP MSR Router Series Wan Access Configuration Manual

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:
Step
1. Enter system view.
2. Enter interface view.
3. Enable IP header compression.
4. Set the maximum number of
connections for which an interface
can perform RTP header
compression.
5. Set the maximum number of
connections for which an interface
can perform TCP header
compression.

Enabling PPP link quality monitoring

PPP link quality monitoring (LQM) monitors the quality (packet loss ratio and packet error ratio) of PPP
links (including those in MP bundles) in real time.
If PPP LQM is not enabled, each end of a PPP link periodically sends keepalives to its peer. If PPP LQM
is enabled, Link Quality Reports (LQRs) packets replace keepalives to monitor the link.
The system uses received LQR packets to measure the link quality. If two consecutive measured results are
below the close-percentage, the system shuts down the link. Then the system measures the link quality at
an interval that is ten times the LQR interval. If three consecutive measured results are higher than the PPP
LQM resume-percentage, the system brings up the link.
A shut-down link must experience at least 30 keepalive intervals before it can come up again. HP
recommends not setting the keepalive interval to a large value.
If you enable PPP LQM on both sides of a PPP link, make sure both sides have the same PPP LQM settings.
Typically, there is no need to enable PPP LQM on both sides of a PPP link.
HP recommends not enabling PPP LQM on a DDR dial-up link because DDR tears the link down when the
link is closed by LQM. Then LQM cannot send LQR packets to resume the link.
To enable PPP LQM:
Command
system-view
interface interface-type
interface-number
ppp compression iphc
enable [ nonstandard ]
ppp compression iphc
rtp-connections number
ppp compression iphc
tcp-connections number
18
Remarks
N/A
N/A
By default, IP header compression
is disabled.
The nonstandard option must be
specified when the device
communicates with a non-HP
device.
The default setting is 16.
The default setting is 16.