CCNA 4 v3.0 Module 5 Frame Relay
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Objectives Frame Relay concepts Configuring Frame Relay
Frame Relay Operation
Frame Relay Switches
Frame Relay Concepts
Local Significance of DLCIs The data-link connection identifier (DLCI) is stored in the Address field of every frame transmitted.
Terminology The connection through the Frame Relay network between two DTEs is called a virtual circuit (VC). Virtual circuits may be established dynamically by sending signaling messages to the network. In this case they are called switched virtual circuits (SVCs).
Frame Relay Stack Layered Support
Frame Relay Functions
Bandwidth and Flow Control Bit counter Example 1
Frame Relay Concepts
LAPF Frame
Full-Mesh Topology
Frame Relay Mesh
LMI Three types of LMIs are supported by Cisco routers: Cisco — The original LMI extensions Ansi — Corresponding to the ANSI standard T1.617 Annex D q933a — Corresponding to the ITU standard Q933 Annex A
Stages of Inverse ARP and LMI Operation #1
Stages of Inverse ARP and LMI Operation #2
Configuring Basic Frame Relay
Configuring a Static Frame Relay Map
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 other multiaccess media environments, where all the routers are on the same subnet.
Frame Relay Subinterfaces
Configuring Point-to-Point Subinterfaces
Verifying Frame Relay The show interfaces command displays information regarding the encapsulation and Layer 1 and Layer 2 status. It also displays information about the following: The LMI type The LMI DLCI The Frame Relay data terminal equipment/data circuit-terminating equipment (DTE/DCE) type
The show frame-relay lmi Command
The show frame-relay pvc Command
The show frame-relay map Command
Troubleshooting Frame Relay Use the debug frame-relay lmi command to determine whether the router and the Frame Relay switch are sending and receiving LMI packets properly.