Chapter 8 Routing Textbook

Chapter 8 Routing Textbook - The Routing Table A Closer...

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© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1 Version 4.0 The Routing Table: A Closer Look Routing Protocols and Concepts – Chapter 8
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2 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Describe the various route types found in the routing table structure. Describe the routing table lookup process. Describe routing behavior in routed networks. Objectives
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3 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Chapter focus: Structure of the routing table. Lookup process of the routing table. Classless and classful routing behaviors. Introduction
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4 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Lab topology 3 router setup: R1 and R2 share a common 172.16.0.0/16 network with 172.16.0.0/24 subnets R2 and R3 are connected by the 192.168.1.0/24 network R3 also has a 172.16.4.0/24 subnet, which is disconnected, or discontiguous, from the 172.16.0.0 network that R1 and R2 share Routing Table Structure
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5 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Routing table entries come from the following sources: Directly connected networks Static routes Dynamic routing protocols Routing Table Structure
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6 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Level 1 routes As soon as the no shutdown command is issued the route is added to routing table Routing Table Structure
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7 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Cisco IP routing table is a hierarchical structure The reason for this is to speed up lookup process Routing Table Structure
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8 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Level 1 routes: Have a subnet mask equal to or less than the classful mask of the network address Level 1 routes can function as: Default routes Supernet routes Network routes Routing Table Structure
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9 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Level 1 routes: Ultimate routes includes either: A next-hop address OR An exit interface Routing Table Structure
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10 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Parent and child routes: A parent route is a level 1 route A parent route does not contain any next- hop IP address or exit interface information Routing Table Structure
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11 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Automatic creation of parent routes: Occurs any time a subnet is added to the routing table Child routes: Child routes are level 2 routes Child routes are a subnet of a classful network address Routing Table Structure
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12 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Level 2 child routes contain route source and the network address of the route Level 2 child routes are also considered ultimate routes Reason: they contain the next hop address and/or exit interface Routing Table Structure
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13 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Both child routes have the same subnet mask. This means the parent route maintains the /24 mask Routing Table Structure
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