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:

You can set the following properties:

• 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.

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