CCNA Discovery 2 - Chapter 6

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CCNA Discovery 2 - Chapter 6

  1. 1. Routing Working at a Small-to-Medium Business or ISP – Chapter 6Version 4.1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  2. 2. Objectives Describe the purpose and function of dynamic routing and the protocols used to implement it. Configure RIPv2 dynamic routing using the Cisco IOS. Describe the use of exterior routing protocols across the Internet. Enable BGP on a customer site router. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  3. 3. Enabling Routing Protocols Routing tables contain locally connected networks Routers use routing tables to determine routes Routes can be statically assigned or dynamically learned through routing protocols © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  4. 4. Enabling Routing Protocols Components of a route: destination value, subnet mask, gateway, route cost or metric © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  5. 5. Enabling Routing Protocols Directly connected routes Static routes Dynamically updated routes Default route © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  6. 6. Enabling Routing Protocols Static routes are manually configured Static routes are suitable for small networks with few changes © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  7. 7. Enabling Routing ProtocolsCharacteristics of distance vector protocols: Routers share copies of routing tables Distance metric can be based on hops, cost, bandwidth, speed, delay or reliability Vector is the address of the next hop along a route © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  8. 8. Enabling Routing ProtocolsRouting Information Protocol (RIP): RFC 1058 Distance vector using hop count metric Updates every 30 seconds © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  9. 9. Enabling Routing ProtocolsEnhanced Interior Gateway Routing Protocol: (EIGRP) Enhanced distance vector protocol Uses a variety of metrics Cisco-proprietary © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  10. 10. Enabling Routing ProtocolsCharacteristics of link-state protocols: Full database of distant routers and interconnections Link-state advertisements Topological database SPF algorithm © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  11. 11. Enabling Routing ProtocolsOpen Shortest Path First (OSPF): Non-proprietary Link-state RFC 2328 Advanced protocol © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  12. 12. Enabling Routing ProtocolsCriteria for choosing routing protocols: Ease of management Ease of configuration Efficiency © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  13. 13. Enabling Routing Protocols Describe and implement RIP routing on an integrated router © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  14. 14. Exterior Routing Protocols The Internet is divided into autonomous systems AS: a set of networks controlled by a single administration using the same internal routing policy Each ISP is an AS © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  15. 15. Exterior Routing Protocols Interior gateway protocols (IGPs) exchange routing information within an AS or individual organization Exterior gateway protocols (EGPs) exchange routing information between autonomous systems © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  16. 16. Exterior Routing Protocols Each AS uses dedicated border gateway routers to route packets across the Internet © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  17. 17. Exterior Routing Protocols ISPs use exterior routing protocols to forward or control local and/or transit traffic Exterior protocols enforce policies and support reliability © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  18. 18. Exterior Routing ProtocolsConfiguring Border Gateway Protocol (BGP): Configure the AS number Identify ISP neighbor router © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  19. 19. Summary All routers make routing decisions by looking up information stored in their routing tables. Routes can be statically assigned by an administrator, or dynamically learned by the router via a routing protocol. Routing protocols use either distance-vector or link-state algorithms to calculate the best routes to each destination. Criteria such as ease of management, ease of configuration, and efficiency must be considered when selecting a routing protocol for use within an organization. Organizations are also called Autonomous Systems. Between Autonomous Systems, Exterior Gateway routing protocols control the flow of traffic. ISPs handle Internet traffic through the use of routing policies. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  20. 20. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 20

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