Enable link quality monitoring (lqm), Enable link quality monitoring (lqm) -6 – AIS Router AI2524 User Manual

Page 232

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AI2524 Router Card User’s Manual

Page 11-6

August 1997

2524UM

3.

Configure Router zzz.

hostname zzz

interface serial 0

encapsulation ppp

ppp authentication chap

username xxx password secretxz

username yyy password secretzy

When you look at the configuration file, the passwords will be en
crypted and the display will look similar to:

hostname xxx

interface serial 0

encapsulation ppp

ppp authentication chap

username yyy password 7 121F0A

username zzz password 7 1329A05

Enable Link
Quality
Monitoring
(LQM)

Link Quality Monitoring (LQM) is available on all serial interfaces
running PPP. LQM will monitor the link quality, and if the quality
drops below a configured percentage, the router shuts down the link.
The percentages are calculated for both the incoming and outgoing di-
rections. The outgoing quality is calculated by comparing the total
number of packets and bytes sent to the total number of packets and
bytes received by the destination node. The incoming quality is calcu-
lated by comparing the total number of packets and bytes received to
the total number of packets and bytes sent by the destination peer.

When LQM is enabled, Link Quality Reports (LQRs) are sent every
keepalive period. LQRs are sent in place of keepalives. All incoming
keepalives are responded to properly. If LQM is not configured, kee-
palives are sent every keepalive period and all incoming LQRs are re-
sponded to with an LQR.

In interface configuration mode, enable LQM on the interface:

ppp quality

percentage

The percentage argument specifies the link quality threshold. That per-
centage must be maintained, or the link is deemed to be of poor quality
and taken down.

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