cidr.ppt
DESCRIPTION
route summarization and classless inter -domain routingTRANSCRIPT
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© 2003, Cisco Systems, Inc. All rights reserved.
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© 2003, Cisco Systems, Inc. All rights reserved. 2
Building Scalable Cisco Internetworks (BSCI) Version 2.0
Instructor Name
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Advanced IP Addressing
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Route Summarization and Classless Interdomain Routing
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-5
Objectives
Upon completing this lesson, you will be able to: • Describe route summarization implementation
• Calculate route summarization
• Explain classless interdomain routing (CIDR) implementation
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-6
What Is Route Summarization?
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-7
Summarizing Within an Octet
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-8
Summarizing Addresses in a VLSM-Designed Network
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-9
Classless Interdomain Routing
• CIDR is a mechanism developed to alleviate exhaustion of addresses and reduce routing table size.
• Block addresses can be summarized into single entries without regard to the classful boundary of the network number.
• Summarized blocks are installed in routing tables.
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-10
What Is CIDR?
• Addresses are the same as in the route summarization figure, except that Class B network 172 has been replaced by Class C network 192.
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-11
CIDR Example
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© 2003, Cisco Systems, Inc. All rights reserved. BSCI 2.0—1-12
Summary
This lesson presented these key points: • The role 4 route summarization in an internetwork
• The differences and similarities between route summarization and CIDR
• How to calculate route summarization
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Written Exercise
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