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CCNA 4 Chapter 15
Frame Relay
By
PRAVEENKUMAR P.J
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Objectives
Frame Relay concepts
Configuring Frame Relay
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Frame Relay Operation
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Frame Relay Concepts
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Frame Relay Switches
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DLCI
The data-link connection identifier (DLCI) isstored in the Address field of every frametransmitted.
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Terminology
The connection through the Frame Relaynetwork between two DTEs is called a virtual
circuit (VC). Virtual circuits may be established
dynamically by sending signaling messagesto the network. In this case they are called
switched virtual circuits (SVCs).
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Frame Relay Stack
Layered Support
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Frame Relay Functions
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Bandwidth and Flow Control
Bit counterExample 1
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Concepts
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LAPF Frame
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Full-Mesh Topology
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Frame Relay Mesh
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LMI
Cisco The original LMI extensions
Ansi Corresponding to the ANSI standard
T1.617 Annex D q933a Corresponding to the ITU standard
Q933 Annex A
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Stage 1 of Inverse ARP and
LMI Operation
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Stage 2 of Inverse ARP and
LMI Operation
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Configuring Frame Relay
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Configuring Basic Frame Relay
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Configuring a Static
Frame Relay Map
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Reachability Issues with Routing
Updates in NBMA
By default, a Frame Relay network provides nonbroadcast multiaccess (NBMA)connectivity between remote sites. An NBMA environment is treated like othermultiaccess media environments, where all the routers are on the same subnet.
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Frame Relay Subinterfaces
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Configuring PPP Interfaces
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Verifying Frame Relay
The show interfaces command displays
information regarding the encapsulation and
Layer 1 and Layer 2 status. It also displaysinformation about the following:
The LMI type
The LMI DLCI
The Frame Relay data terminal equipment/datacircuit-terminating equipment (DTE/DCE) type
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The show frame-relay lmi
Command
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The show frame-relay pvc
Command
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The show frame-relay map
Command
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Troubleshooting Frame Relay
Use the debug frame-relay lmi
command to determine whether the router
and the Frame Relay switch are sending andreceiving LMI packets properly.
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