For glory on your CCNA 640-802 and CCENT exams, you entail to take to mean how and why Frame Relay LMI messages direct. You involve to cognize this for real-world networking as well, since Frame Relay is rife in today's networks - and lacking LMI, you have no Frame Relay!

The Local Management Interface (LMI) messages are conveyed betwixt the DCE, as usual the service provider, and the DTE, the Cisco trained worker. LMI Status messages serve as keepalives for the bones intersection. If keepalives are not continually normative by both the DCE and DTE, the frame connectedness will blob. The LMI as well indicates the PVC status to the router, echolike as either alive or unoccupied.

The LMI types must friction match on the DTE and DCE for the PVC to be verified. There are iii types of LMI:

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Cisco (the evasion)



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The LMI variety can be denaturised near the bones lmi-type enjoin. Before doing anything near the supporting structure relay commands, though, we have to alter supporting structure handing over on the surface with the status frame-relay order. Remember, the evasion status style on a Cisco Serial interface is HDLC.

R1(config)#interface serial0

R1(config-if)#encapsulation ?

atm-dxi ATM-DXI encapsulation

frame-relay Frame Relay networks

hdlc Serial HDLC synchronous

lapb LAPB (X.25 Level 2)

ppp Point-to-Point protocol

smds Switched Megabit Data Service (SMDS)

x25 X.25

R1(config-if)#encapsulation frame-relay

R1(config-if)#frame-relay lmi-type ?




We can hardcode the LMI genus as shown in that example, and there's another way to get the LMI to clash near the distant DCE. LMI Autosense has the skilled worker convey out an LMI Status phone call for all iii LMI types.

The trained worker after waits for a riposte for one of those LMI types from the DCE. When the trained worker sees the retort to its LMI Autosense messages, the trained worker will past distribute simply the identical LMI species it acceptable from the DCE.

On special occasions - specified as your CCNA exam, maybe :) - the Frame LMI may not ignitor. We'll take a countenance at such a book in the next installment of my discriminatory Cisco CCENT / CCNA 640-802 authorisation communication teacher series!


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