For success on your CCNA 640-802 and CCENT exams, you call for to grasp how and why Frame Relay LMI messages operate. You obligation to know this for real-world networking as well, since Frame Relay is prevailing in today's networks - and lacking LMI, you have no Frame Relay!
The Local Management Interface (LMI) messages are dispatched involving the DCE, as usual the resource provider, and the DTE, the Cisco skilled worker. LMI Status messages ladle as keepalives for the framework link. If keepalives are not continually prescriptive by some the DCE and DTE, the supporting structure connexion will small indefinite amount. The LMI as well indicates the PVC cachet to the router, reflected as either influential or unreactive.
The LMI types must match on the DTE and DCE for the PVC to be recognized. There are 3 types of LMI:
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Cisco (the defaulting)
ansi
q933a
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The LMI nature can be varied near the bones lmi-type command. Before doing anything with the skeleton relay commands, though, we have to change framework relay on the interface near the condition frame-relay instruct. Remember, the defaulting condition category 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 style as shown in that example, and there's different way to get the LMI to clash near the cut off DCE. LMI Autosense has the skilled worker transport out an LMI Status communication for all cardinal LMI types.
The skilled worker past waits for a result for one of those LMI types from the DCE. When the trained worker sees the reply to its LMI Autosense messages, the trained worker will past distribute lone the aforesaid LMI nature it standard from the DCE.
On few and far between occasions - specified as your CCNA exam, possibly :) - the Frame LMI may not contest. We'll pocket a face at specified a script in the next installment of my discriminatory Cisco CCENT / CCNA 640-802 certification exam teacher series!
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