For natural event on your CCNA 640-802 and CCENT exams, you necessitate to get the drift how and why Frame Relay LMI messages direct. You have need of 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 dispatched linking the DCE, typically the service provider, and the DTE, the Cisco skilled worker. LMI Status messages spoon over as keepalives for the skeleton connectedness. If keepalives are not forever accepted by some the DCE and DTE, the supporting structure link will collapse. The LMI besides indicates the PVC cachet to the router, echolike as either involved or redundant.
The LMI types must match on the DTE and DCE for the PVC to be matured. There are iii types of LMI:
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Cisco (the defaulting)
ansi
q933a
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The LMI variety can be denatured with the framework lmi-type command. Before doing anything near the supporting structure relay commands, though, we have to modify supporting structure handing over on the surface beside the condition frame-relay tell. Remember, the failure to pay status hue 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 ?
cisco
ansi
q933a
We can hardcode the LMI manner as shown in that example, and there's different way to get the LMI to clash beside the distant DCE. LMI Autosense has the skilled worker send out an LMI Status message for all cardinal LMI types.
The trained worker consequently waits for a response for one of those LMI types from the DCE. When the skilled worker sees the upshot to its LMI Autosense messages, the trained worker will later move merely the said LMI hue it received from the DCE.
On dying out occasions - such as your CCNA exam, perchance :) - the Frame LMI may not lighter. We'll clutch a face at such a script in the subsequent installment of my unshared Cisco CCENT / CCNA 640-802 authorization communication instructor series!
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