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Lecture CCNA Exploration 4.0 (Kỳ 2) - Chapter 5: RIP version 1

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The following will be discussed in this chapter: Describe the functions, characteristics, and operation of the RIPv1 protocol; configure a device for using RIPv1; verify proper RIPv1 operation; describe how RIPv1 performs automatic summarization; configure, verify, and troubleshoot default routes propagated in a routed network implementing RIPv1; Use recommended techniques to solve problems related to RIPv1.
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Lecture CCNA Exploration 4.0 (Kỳ 2) - Chapter 5: RIP version 1 Chapter 5: RIP version 1 CCNA Exploration version 4.0 Objectives • Describe the functions, characteristics, and operation of the RIPv1 protocol. • Configure a device for using RIPv1. • Verify proper RIPv1 operation. • Describe how RIPv1 performs automatic summarization. • Configure, verify, and troubleshoot default routes propagated in a routed network implementing RIPv1. • Use recommended techniques to solve problems related to RIPv1 Học viện mạng Bách Khoa - Website: www.bkacad.com 2 RIPv1: Distance Vector, Classful Routing Protocol Học viện mạng Bách Khoa - Website: www.bkacad.com 3 RIP History Học viện mạng Bách Khoa - Website: www.bkacad.com 4 RIP Characteristics 1. A classful, Distance Vector (DV) routing protocol 2. Metric = hop count 3. Routes with a hop count > 15 are unreachable (considers a metric of 16 as infinity ) 4. Updates are broadcast every 30 seconds 5. Calculates metrics using the Bellman Ford algorithm Học viện mạng Bách Khoa - Website: www.bkacad.com 5 RIPv1 Message 5.1.2.1 Học viện mạng Bách Khoa - Website: www.bkacad.com 6 RIP Message Format 5.1.2.2 Why are there so many fields set to zero? Học viện mạng Bách Khoa - Website: www.bkacad.com 7 RIP Message Format • RIP header - divided into 3 fields 1. Command field 2. Version field 3. Must be zero • Route Entry - composed of 3 fields 1. Address family identifier 2. IP address 3. Metric Học viện mạng Bách Khoa - Website: www.bkacad.com 8 RIP Operation 5.1.3.1 1. Request message – Each RIP-configured interface sends out a request message on startup, requesting that all RIP neighbors send their complete routing tables. 2. Response message – A response message is sent back by RIP- enabled neighbors. Học viện mạng Bách Khoa - Website: www.bkacad.com 9 RIPv1 a) b) c) Triggered update Học viện mạng Bách Khoa - Website: www.bkacad.com 10 RIPv1 Học viện mạng Bách Khoa - Website: www.bkacad.com 11 RIPv1 • RIP is a classful routing protocol 1. Does not send subnet masks in routing updates 2. When update routing information, using: 1. The subnet mask configured on a local interface 2. or applies the default subnet mask based on the address class. 3. RIPv1 networks cannot be discontiguous nor can they implement VLSM. Học viện mạng Bách Khoa - Website: www.bkacad.com 12 Administrative Distance 5.1.4 Học viện mạng Bách Khoa - Website: www.bkacad.com 13 Administrative Distance • Default AD=120. • When compared to other interior gateway protocols, RIP is the least-preferred routing protocol. • IS-IS, OSPF, IGRP, and EIGRP all have lower default AD values. Học viện mạng Bách Khoa - Website: www.bkacad.com 14 Basic RIPv1 Configuration Học viện mạng Bách Khoa - Website: www.bkacad.com 15 Basic RIPv1 Configuration • Router(config)# router rip 5.2.2 • Router(config-router)# network A.B.C.D Học viện mạng Bách Khoa - Website: www.bkacad.com 16 Basic RIPv1 Configuration R1(config)#router rip (config-router)#network 192.168.1.0 (config-router)#network 192.168.2.0 (config-router)#network 172.16.1.0 R2(config)#router rip (config-router)#network 192.168.3.0 (config-router)#network 192.168.2.0 (config-router)#network 172.16.2.0 Học viện mạng Bách Khoa - Website: www.bkacad.com 17 Specifying Networks Học viện mạng Bách Khoa - Website: www.bkacad.com 18 Specifying Networks • Router(config-router)#network directly-connected-classful- network-address – Enables RIP on all interfaces that belong to a specific network. Associated interfaces will now both send and receive RIP updates. – Advertises the specified network in RIP routing updates sent to other routers every 30 seconds. Học viện mạng Bách Khoa - Website: www.bkacad.com 19 Specifying Networks • Typing interface IP addresses as the following: – Router(config-if)#router rip – Router(config-router)#version 1 – Router(config-router)#network 1.1.1.1 – Router(config-router)#network 1.1.1.2 – Router(config-router)#network 3.3.3.2 • show running-config router rip network 1.0.0.0 network 3.0.0.0 Học viện mạng Bách Khoa - Website: www.bkacad.com 20

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