For success on your CCNA 640-802 and CCENT exams, you inevitability to think through how and why Frame Relay LMI messages direct. You status to cognize this for real-world networking as well, since Frame Relay is current in today's networks - and in need LMI, you have no Frame Relay!
The Local Management Interface (LMI) messages are sent concerning the DCE, routinely the provision provider, and the DTE, the Cisco trained worker. LMI Status messages tennis stroke as keepalives for the carcass seam. If keepalives are not frequently prescriptive by both the DCE and DTE, the framework tie will small indefinite amount. The LMI too indicates the PVC distinction to the router, mirrored as either progressive or at rest.
The LMI types essential ignitor on the DTE and DCE for the PVC to be advanced. There are 3 types of LMI:
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Cisco (the defaulting)
ansi
q933a
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The LMI style can be denatured beside the skeleton lmi-type bid. Before doing thing with the framing handing over commands, though, we have to change framework passage on the surface with the condition frame-relay command. Remember, the evasion condition kind on a Cisco Serial surface 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
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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 next to the faraway DCE. LMI Autosense has the skilled worker direct out an LMI Status communication for all cardinal LMI types.
The trained worker later waits for a issue for one of those LMI types from the DCE. When the trained worker sees the response to its LMI Autosense messages, the skilled worker will later dispatch with the sole purpose the very LMI class it standard from the DCE.
On uncommon occasions - specified as your CCNA exam, perhaps :) - the Frame LMI may not contest. We'll purloin a expression at such a playscript in the close installment of my privileged Cisco CCENT / CCNA 640-802 certification test teacher series!
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