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CCNA Discovery 3 - Chapter 6

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CCNA Discovery 3 - Chapter 6

  1. 1. Routing With a Link-State Protocol Introducing Routing and Switching in the Enterprise – Chapter 6 Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  2. 2. Objectives  Describe and plan a network using OSPF.  Design and configure a network using single-area OSPF.  Work with multi-protocol environments. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  3. 3. Describe and Plan a Network Using OSPF  Link-state routing protocol  Open standard developed by IETF  Classless interior gateway protocol  Divides the network into areas for scalability © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  4. 4. Describe and Plan a Network Using OSPF  Bandwidth determines the cost of a link  Higher bandwidth = lower cost = desirable route • Cost = 100,000,000 / bandwidth of link in bps • Manual cost configuration at an interface: ip ospf cost © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  5. 5. Describe and Plan a Network Using OSPF  SPF algorithm (Diijkstra’s Algorithm)  Each router has a topological tree  SPF tree information stored in topology database © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  6. 6. Describe and Plan a Network Using OSPF  Adjacencies: neighbor relationships  Hello protocol  Router ID  Role of loopback interfaces © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  7. 7. Describe and Plan a Network Using OSPF  Designated router (DR)  Backup designated router (BDR)  DROther © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  8. 8. Describe and Plan a Network Using OSPF  Area 0  Roles of routers in an OSPF Autonomous System: Area Border Router (ABR) Autonomous System Border Router (ASBR) © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  9. 9. Design and Configure a Network Using Single-Area OSPF OSPF configuration steps:  Enable OSPF + process ID  Advertise networks + wildcard mask and area ID © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  10. 10. Design and Configure a Network Using Single-Area OSPF  Authentication protects integrity of routing information  Simple password authentication  Message Digest 5 (MD5) © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  11. 11. Design and Configure a Network Using Single-Area OSPF Tune OSPF parameters:  Interface priority  Router ID  Loopback and interface addresses  Bandwidth (cost ) © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  12. 12. Design and Configure a Network Using Single-Area OSPF Verification and troubleshooting commands:  show ip ospf neighbor  show ip protocols, show ip route  show ip ospf, show ip ospf interface © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  13. 13. Work with Multi-Protocol Environments  Default route configured on ASBR  ASBR distributes the route into the OSPF network © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  14. 14. Work with Multi-Protocol Environments Benefits of OSPF summarization:  Reduces number of networks advertised  Reduces memory requirements  Reduces number of entries in router updates  Isolates flapping and other problems to their location © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  15. 15. Work with Multi-Protocol Environments OSPF limitations:  Increased router memory and processing demands  Strict design requirements  Knowledgable administrator required  Initial discovery process takes up network bandwidth © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  16. 16. Work with Multi-Protocol Environments  Administrative distance (AD) determines routes that appear in routing table © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  17. 17. Summary  OSPF is a classless interior link-state routing protocol used in enterprise networks  OSPF uses bandwidth to generate the cost metric  OSPF routers elect a DR and BDR on multi-access networks  Router ID or router priority can be used to dictate the selection of DR and BDR  The OSPF network command uses a wildcard mask  Default route distribution and inter-area route summarization are used in OSPF networks © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  18. 18. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18

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