For success on your CCNA 640-802 and CCENT exams, you stipulation to comprehend how and why Frame Relay LMI messages run. You condition to know this for real-world networking as well, since Frame Relay is prevalent in today's networks - and minus LMI, you have no Frame Relay!
The Local Management Interface (LMI) messages are dispatched relating the DCE, naturally the pay provider, and the DTE, the Cisco skilled worker. LMI Status messages dollop as keepalives for the carcass linkage. If keepalives are not unendingly accepted by both the DCE and DTE, the skeleton association will drop. The LMI also indicates the PVC kudos to the router, reflected as either live or at rest.
The LMI types essential contest on the DTE and DCE for the PVC to be deep-rooted. There are three types of LMI:
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The LMI group can be denaturized with the bones lmi-type command. Before doing anything near the framing passage commands, though, we have to change bones handing over on the surface beside the condition frame-relay bid. Remember, the non-attendance status genre 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 ?
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We can hardcode the LMI kind as shown in that example, and there's other way to get the LMI to meeting beside the secluded DCE. LMI Autosense has the trained worker dispatch out an LMI Status announcement for all iii LMI types.
The trained worker afterwards waits for a issue for one of those LMI types from the DCE. When the skilled worker sees the riposte to its LMI Autosense messages, the skilled worker will next direct lonesome the aforesaid LMI kind it accepted from the DCE.
On pink occasions - specified as your CCNA exam, maybe :) - the Frame LMI may not light. We'll thieve a appearance at such a scenario in the side by side installment of my snobby Cisco CCENT / CCNA 640-802 documents examination teacher series!
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