Configuring Frame Relay Traffic Shaping

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Lab 12: Configuring PPP Analog Backup for Synchronous Links ”Part I

Practical Scenario

Most sites that have ISDN or analog backup for their serial links use PPP as the data-link protocol. A common struggle with DDR is ensuring that it dials only at the appropriate times. An ISDN or asynchronous line that is dialing because of an improperly configured ACL can be costly. Other limitations put upon the design of your network also might force you to configure dial backup in another fashion. For example, if you had to configure a dial interface in OSPF Area 0 or another regular area, it would dial continuously because of link-state flooding.

Lab Exercise

The SuperGreat Food Corp. runs an IP-based automated inventory system on an IBM 3090x-based platform at its corporate headquarters. Each branch is connected to SuperGreat Foods through a 64-kbps PPP connection. Located at each branch is an RS6000. The RS6000 requires IP connectivity to the mainframe, as well as the SuperGreat IP network. The SuperGreat IP network is in autonomous system 2001; for full IP reachability, you must run EIGRP on all links. Design your network in accordance to the following guidelines set forth form SuperGreat Corp:

  • Use PPP as your data-link protocol on all serial links. Authenticate with CHAP on all PPP links. The CHAP password is cub9biggs.

  • Using EIGRP as the routing protocol, you must exchange routes on all links. Use 2001 as the autonomous System ID.

  • Configure the serial link so that, upon loss of the circuit, the AUX port will provide dial backup. You must send and receive routing updates on the backup port as well.

Lab Objectives

  • Configure the SuperGreat network, as depicted in Figure 4-11.

    Figure 4-11. SuperGreat Foods PPP Network with Dial Backup

    graphics/04fig11.gif

  • Use PPP on the serial link between the branch and the corporate router.

  • Configure analog dial backup between the two sites so that only a loss of the PPP circuit will trigger a call.

  • Use EIGRP as the routing protocol. Do not use any static routes.

Equipment Needed

  • Two Cisco routers, connected through V.35 back-to-back cables or in a similar manner. The LAN type is not significant.

  • Two analog modems, Cisco rolled cables, and MODEM head- shells .

  • Two LAN segments, provided through hubs or switches; the LAN type is not important to the configuration of the lab.

  • Two Windows 95/98/2000 workstations with IP configured to simulate the IBM mainframe and RS6000, as in Figure 4-11.

Physical Layout and Prestaging

  • Connect the hubs, serial cables, and modems to the routers, as shown in Figure 4-11.

  • Connect one Token Ring hub to the sub_branch router, and connect the Ethernet hub to the sub_corp router.

  • Connect and configure two IP-based workstations for testing purposes.

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CCIE Practical Studies, Volume I
CCIE Practical Studies, Volume I
ISBN: 1587200023
EAN: 2147483647
Year: 2001
Pages: 283
Authors: Karl Solie

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