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Cn instructor ppt_chapter4_final
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© 2008 Cisco
Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1 Chapter 4: Frame Relay Connecting Networks
2.
Presentation_ID 2© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 4 4.0 Introduction 4.1 Introduction to Frame Relay 4.2 Configuring Frame Relay 4.3 Troubleshooting Connectivity 4.4 Summary
3.
Presentation_ID 3© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 4: Objectives Describe the fundamental concepts of Frame Relay technology, including operation, implementation requirements, maps, and Local Management Interface (LMI) operation. Configure a basic Frame Relay permanent virtual circuit (PVC), including configuring and troubleshooting Frame Relay on a router serial interface and configuring a static Frame Relay map. Describe advanced concepts of Frame Relay technology, including subinterfaces, bandwidth, and flow control. Configure an advanced Frame Relay PVC, including solving reachability issues, configuring subinterfaces, and verifying and troubleshooting a Frame Relay configuration.
4.
© 2008 Cisco
Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 4 4.1 Introduction to Frame Relay
5.
Presentation_ID 5© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Frame Relay Introducing Frame Relay
6.
Presentation_ID 6© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Frame Relay Benefits of Frame Relay WAN Technology
7.
Presentation_ID 7© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Frame Relay Dedicated Line Requirements
8.
Presentation_ID 8© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Frame Relay Frame Relay Cost Effectiveness and Flexibility With dedicated lines, customers pay for an end-to-end connection, which includes the local loop and the network link. With Frame Relay, customers only pay for the local loop, and for the bandwidth, they purchase from the network provider. Frame Relay shares bandwidth across a larger base of customers. Typically, a network provider can service 40 or more 56 kb/s customers over one T1 circuit. Using dedicated lines would require more CSU/DSUs (one for each line) and more complicated routing and switching.
9.
Presentation_ID 9© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation Virtual Circuits Switched virtual circuits (SVC) – Established dynamically by sending signaling messages to the network. Permanent virtual circuits (PVCs) – Preconfigured by the carrier, and after they are set up, only operate in DATA TRANSFER and IDLE modes. VCs are identified by DLCIs. Frame Relay DLCIs have local significance, which means that the values are not unique in the Frame Relay WAN. A DLCI identifies a VC to the equipment at an endpoint. A DLCI has no significance beyond the single link.
10.
Presentation_ID 10© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation Multiple Virtual Circuits
11.
Presentation_ID 11© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation Frame Relay Encapsulation
12.
Presentation_ID 12© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation Frame Relay Topologies
13.
Presentation_ID 13© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation Frame Relay Address Mapping
14.
Presentation_ID 14© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation Local Management Interface (LMI)
15.
Presentation_ID 15© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation LMI Extensions VC status messages Multicasting Global addressing Simple flow control
16.
Presentation_ID 16© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Frame Relay Operation Using LMI and Inverse ARP to Map Addresses 1. The Inverse ARP request includes the source hardware, source Layer 3 protocol address, and the known target hardware address. 2. The Inverse ARP request fills the target Layer 3 protocol address field with all zeroes. It encapsulates the packet for the specific network and sends it directly to the destination device using the VC. 3. Upon receiving an Inverse ARP request, the destination device uses the source device’s address to create its own DLCI-to- Layer 3 map. 4. It then sends an Inverse ARP response that includes its Layer 3 address information. 5. When the source device receives the Inverse ARP response, it completes the DLCI-to-Layer 3 map using the provided information.
17.
Presentation_ID 17© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Advanced Frame Relay Concepts Access Rate and Committed Information Rate
18.
Presentation_ID 18© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Advanced Frame Relay Concepts Frame Relay Example
19.
Presentation_ID 19© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Advanced Frame Relay Concepts Bursting
20.
Presentation_ID 20© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Advanced Frame Relay Concepts Frame Relay Flow Control When the DCE sets the BECN bit to 1, it notifies devices in the direction of the source (upstream) that there is congestion on the network. When the DCE sets the FECN bit to 1, it notifies devices in the direction of the destination (downstream) that there is congestion on the network. DTE devices can set the value of the DE bit to 1 to indicate that the frame has lower importance than other frames. When the network becomes congested, DCE devices discard the frames with the DE bit set to 1 before discarding those that do not.
21.
© 2008 Cisco
Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 21 4.2 Configuring Frame Relay
22.
Presentation_ID 22© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Configure Basic Frame Relay Basic Frame Relay Configuration Steps
23.
Presentation_ID 23© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Configure Basic Frame Relay Configuring a Static Frame Relay Map
24.
Presentation_ID 24© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Configure Basic Frame Relay Verifying a Static Frame Relay Map
25.
Presentation_ID 25© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Configure Subinterfaces Reachability Issues Frame Relay networks provide NBMA connectivity, using a hub-and- spoke topology, between remote sites. In an NBMA Frame Relay topology, when a single multipoint interface must be used to interconnect multiple sites, routing update reachability issues may result. Reachability Issues: Split horizon Broadcast/multicast replication Neighbor Discovery: DR and BDR
26.
Presentation_ID 26© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Configure Subinterfaces Solving Reachability Issues Disable split horizon – One method for solving the reachability issues that are produced by split horizon may be to turn off split horizon; however, disabling split horizon increases the chances of routing loops in your network. Full-meshed topology – Another method is to use a full-meshed topology; however, this topology increases costs. Subinterfaces – In a hub-and-spoke Frame Relay topology, the hub router can be configured with logically assigned interfaces called subinterfaces.
27.
Presentation_ID 27© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Configure Subinterfaces Configuring Point-to-Point Subinterfaces
28.
Presentation_ID 28© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Configure Subinterfaces Example: Configuring Point-to-Point Subinterfaces
29.
© 2008 Cisco
Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 29 4.3 Troubleshooting Connectivity
30.
Presentation_ID 30© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Troubleshoot Frame Relay Verifying Frame Relay Operation: Frame Relay Interface
31.
Presentation_ID 31© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Troubleshoot Frame Relay Verifying Frame Relay Operation: LMI Operations
32.
Presentation_ID 32© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Troubleshoot Frame Relay Verifying Frame Relay Operation: PVC Status
33.
Presentation_ID 33© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Troubleshoot Frame Relay Verifying Frame Relay Operation: Inverse ARP
34.
Presentation_ID 34© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Troubleshoot Frame Relay Troubleshooting Frame Relay Operation
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Presentation_ID 35© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 4: Summary This chapter described: The fundamental concepts of Frame Relay technology, including operation, implementation requirements, maps, and Local Management Interface (LMI) operation. How to configure a basic Frame Relay permanent virtual circuit (PVC), including configuring and troubleshooting Frame Relay on a router serial interface and configuring a static Frame Relay map. Advanced concepts of Frame Relay technology including subinterfaces, bandwidth and flow control. Advanced Frame Relay PVCs, including solving reachability issues, configuring subinterfaces, and verifying and troubleshooting a Frame Relay configuration.
36.
Presentation_ID 36© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential
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