Configuring Ppp Link Quality Control; Enabling The Ppp Accounting Statistics Function - 3Com MSR 50 Series Configuration Manual

Configuring PPP Link
Quality Control
Enabling the PPP
Accounting Statistics
Function
To do...
Configure Enable the local device
DNS address to assign DNS server
negotiation address for the peer
based on
actual needs
Enable the device to
accept the DNS server
address assigned by the
peer or actively request
its peer for the DNS
server address (use
either of the two)
Introduction to PPP link quality control
PPP link quality control (LQC) can monitor the real-time quality of PPP links
(including those in MP bundles). A link goes down when its quality drops below
the close percentage and goes up when its quality recovers above the
resume-percentage. To avoid frequent flapping, a delay is involved before a link is
reused.
Before you enable PPP LQC, the PPP interface sends keepalives to the peer every
some time. After you enable LQC on the interface, it sends link quality reports
(LQRs) instead of keepalives to monitor the link.
When link quality is normal, the system calculates link quality based on each LQR
and disables the link if the results of two consecutive calculations are below the
close-percentage. Once the link is disabled, the system starts to calculate link
quality every ten LQRs, and brings the link up if the results of three consecutive
calculations are higher than the resume-percentage. This means a disabled link
must experience 30 keepalive periods before it can go up again. If a large
keepalive period is specified, it may take long time for the link to go up.
Configuration procedure
Follow these steps to configure PPP link quality control:
To do...
Enter system view
Enter the specified
interface view
Enable PPP LQC
Introduction to PPP accounting statistics
PPP can generate traffic-based accounting statistics on each PPP link. The statistics
include the amount of the inbound and outbound information (in terms of bytes
and the number of the packets) on a link. The information can be used by AAA
application modules for accounting and control purpose.
Use the command...
ppp ipcp dns
primary-dns-address
[ secondary-dns-address
]
ppp ipcp dns
admit-any
ppp ipcp dns request
Use the command...
system-view
interface interface-type
interface-number
ppp lqc close-percentage
[ resume-percentage ]
Configuring PPP
Remarks
Required
By default, DNS server
address negotiation is
disabled
Required
By default, DNS server
address negotiation is
disabled.
Required
By default, a device is
disabled from requesting
its peer for the DNS
server address actively.
Remarks
-
-
Required
By default, resume-percentage is
equal to close-percentage
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