Configure Frame Relay Keepalives

By default, physical interfaces configured with Cisco HDLC or PPP encapsulation send keepalive packets at 10-second intervals. The Frame Relay term for keepalives is Local Management Interface (LMI) packets; note that the JUNOS software supports both ANSI T1.617 Annex D LMIs and ITU Q933 Annex A LMIs.

To disable the sending of keepalives on a physical interface, include the no-keepalives statement at the [edit interfaces interface interface-name] hierarchy level:

[edit interfaces interface-name]

no-keepalives; 

For back-to-back Frame Relay connections, either disable the sending of keepalives on both sides of the connection, or configure one side of the connection as a DTE (the default JUNOS configuration) and the other as a DCE.

If keepalives are enabled, the number of possible DLCI configurations on a multipoint or multicast connection is limited by the MTU size selected for the interface. To calculate the available DLCIs, use the formula (MTU - 12) /5. To increase the number of possible DLCIs, disable keepalives.