Cisco CCNA 640-802 CCENT Certification Exam Training: Frame Relay LMI And LMI Autosense Computers Articles | November 18 Cheap Patrick Patterson Jersey , 2007
To succeed on your CCNA and CCENT exams as well as working with production networks, you've got to know all about Frame Relay LMI and LMI Autosense.? Learn all about both from Chris Bryant, CCIE #12933.
For success on your CCNA 640-802 and CCENT exams, you need to understand how and why Frame Relay LMI messages operate. You need to know this for real-world networking as well, since Frame Relay is prevalent in today's networks - and without LMI Cheap PJ Tucker Jersey , you have no Frame Relay!
The Local Management Interface (LMI) messages are sent between the DCE, typically the service provider, and the DTE, the Cisco router.? LMI Status messages serve as keepalives for the frame connection.? If keepalives are not continually received by both the DCE and DTE, the frame connection will drop.? The LMI also indicates the PVC status to the router Cheap KJ McDaniels Jersey , reflected as either active or inactive.
The LMI types must match on the DTE and DCE for the PVC to be established. There are three types of LMI:?
Cisco (the default)
ansi
q933a
The LMI type can be changed with the frame lmi-type command. Before doing anything with the frame relay commands, though, we have to enable frame relay on the interface with the encapsulation frame-relay command.? Remember, the default encapsulation type 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 type as shown in that example, and there's another way to get the LMI to match with the remote DCE. LMI Autosense has the router send out an LMI Status message for all three LMI types.
The router then waits for a response for one of those LMI types from the DCE.? When the router sees the response to its LMI Autosense messages Cheap Lucas Nogueira Jersey , the router will then send only the same LMI type it received from the DCE.
On rare occasions - such as your CCNA exam, perhaps :) - the Frame LMI may not match. We'll take a look at such a scenario in the next installment of my exclusive Cisco CCENT CCNA 640-802 certification exam tutorial series!
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