Igrp cisco proprietary obsolete

Chapter 5: Dynamic Routing CCNA Routing and Switching

 5.2 Distance Vector Dynamic Routing

• Explain how distance vector routing protocols operate.

• Describe the algorithm used by link-state routing protocols to determine the best path. • Explain how the link-state routing protocol uses information sent in a link-state update.

• Explain the advantages and disadvantages of using link-state routing protocols.		2
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Types of Routing Protocols
Classifying Routing Protocols

 The purpose of dynamic routing protocols includes:
 The purpose of dynamic routing protocols includes:	© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential	4

Types of Routing Protocols
IGP and EGP Routing Protocols

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Types of Routing Protocols
Distance Vector Routing Protocols

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Types of Routing Protocols
Link-State Routing Protocols

	 Link-state routing protocols do not use periodic updates. • updates are only sent when there is a change in the topology

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 Classful routing protocols do not send subnet mask information in routing updates.  Classful routing protocols cannot support variable-length subnet masks (VLSMs) and classless interdomain routing (CIDR).
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Types of Routing Protocols
Classless Routing Protocols

 Classless IPv4 routing protocols (RIPv2, EIGRP, OSPF, and IS-IS) all include the subnet mask information in routing updates.
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Types of Routing Protocols
Routing Protocol Characteristics

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Distance Vector Routing Protocol Operation Distance Vector Technologies
	•	RIPv1 sends updates as broadcasts 255.255.255.255.
	•	RIPv2 and EIGRP can use multicast addresses to reach only specific neighbor routers.
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Distance Vector Routing Protocol Operation
Distance Vector Algorithm


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	•	Mechanism for detecting and reacting to topology changes
	 RIP uses the Bellman-Ford algorithm as its routing algorithm.
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•	Easy to confgure	 RIPng
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•	RIPv2
•	Classless routing protocol - supports VLSM and CIDR
•	Classless routing protocol - supports VLSM and CIDR	•
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	Secure - supports authentication