For happening on your CCNA 640-802 and CCENT exams, you stipulation to get the drift how and why Frame Relay LMI messages direct. You involve to cognise this for real-world networking as well, since Frame Relay is rife in today's networks - and without LMI, you have no Frame Relay!
The Local Management Interface (LMI) messages are transmitted linking the DCE, typically the service provider, and the DTE, the Cisco skilled worker. LMI Status messages spoon over as keepalives for the frame association. If keepalives are not frequently prescriptive by both the DCE and DTE, the bones bond will bubble. The LMI likewise indicates the PVC position to the router, echoic as either moving or desk.
The LMI types essential light on the DTE and DCE for the PVC to be entrenched. There are 3 types of LMI:Post ads:
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The LMI sort can be denaturized beside the framework lmi-type bid. Before doing thing next to the carcass passage commands, though, we have to modify bones relay on the interface near the condition frame-relay dictation. Remember, the defaulting condition kind on a Cisco Serial interface is HDLC.
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)
R1(config-if)#frame-relay lmi-type ?
We can hardcode the LMI nature as shown in that example, and there's different way to get the LMI to friction match next to the distant DCE. LMI Autosense has the skilled worker send out an LMI Status letter for all cardinal LMI types.
The trained worker then waits for a effect for one of those LMI types from the DCE. When the trained worker sees the answer to its LMI Autosense messages, the skilled worker will afterwards transport solely the aforesaid LMI kind it standard from the DCE.
On special occasions - such as your CCNA exam, maybe :) - the Frame LMI may not igniter. We'll take a gawp at such a book in the adjacent installment of my unshared Cisco CCENT / CCNA 640-802 enfranchisement test instructor series!