ccna 4 v3.0 module 5 frame relay
DESCRIPTION
CCNA 4 v3.0 Module 5 Frame Relay. Objectives. Frame Relay concepts Configuring Frame Relay. Frame Relay Operation. Frame Relay Switches. Frame Relay Concepts. Local Significance of DLCIs. - PowerPoint PPT PresentationTRANSCRIPT
222© 2003, Cisco Systems, Inc. All rights reserved.
Objectives
• Frame Relay concepts
• Configuring Frame Relay
666© 2003, Cisco Systems, Inc. All rights reserved.
Local Significance of DLCIs
The data-link connection identifier (DLCI) is stored in the Address field of every frame transmitted.
777© 2003, Cisco Systems, Inc. All rights reserved.
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).
101010© 2003, Cisco Systems, Inc. All rights reserved.
Bandwidth and Flow Control
Bit counter Example 1
151515© 2003, Cisco Systems, Inc. All rights reserved.
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
202020© 2003, Cisco Systems, Inc. All rights reserved.
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.
232323© 2003, Cisco Systems, Inc. All rights reserved.
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