Configuring Link Services Keepalive Settings on Frame Relay
LMI
You can tune the keepalive settings on the physical
link-services interface. By default, the JUNOS software uses ITU Q.933
Annex A LMIs for FRF.16. To use ITU Annex A LMIs, include the lmi-type ansi statement at the [edit interfaces ls-fpc/pic/port:channel mlfr-uni-nni-bundle-options] hierarchy
level:
To configure Frame Relay keepalive parameters on
a link services interface, include the n391, n392, n393, t391 and t392 statements at the [edit interfaces ls-fpc/pic/port:channel mlfr-uni-nni-bundle-options] hierarchy level:
n391—Full status polling interval. The data terminal
equipment (DTE) sends a status inquiry to the data communication equipment
(DCE) at the interval specified by t391. n391 specifies the frequency
with which these inquiries expect a full status report; for example,
an n391 value of 10 would specify a full status report in response
to every tenth inquiry. The intermediate inquiries ask for a keepalive
exchange only. The range is 1 through 255, with a default value of
6.
n392—Error threshold. The number of errors required
to bring down the link, within the event count specified by n393.
The range is from 1 through 10, with a default value of 3.
n393—Monitored event count. The range is from 1 through 10,
with a default value of 4.
t391—Keepalive timer. Interval at which the DTE
sends out a keepalive response request to the DCE and updates status,
depending on the error threshold value. The range is from 5 through 30 seconds,
with a default value of 10 seconds.
t392—Keepalive timer. Period during which the DCE
checks for keepalive responses from the DTE and updates status, depending
on the DCE error threshold value. The range is from 5 through
30 seconds, with a default value of 15 seconds.
Note:
For the LMI to work properly, you must configure
one side of a link services bundle to be a DCE.
