tailieunhanh - Lecture Routing Protocols and Concepts - Chapter 9: EIGRP

Chapter 9 describe the background and history of Enhanced Interior Gateway Routing Protocol (EIGRP), examine the basic EIGRP configuration commands and identify their purposes, calculate the composite metric used by EIGRP, describe the concepts and operation of DUAL, describe the uses of additional configuration commands in EIGRP. | EIGRP Routing Protocols and Concepts – Chapter 9 Objectives Describe the background and history of Enhanced Interior Gateway Routing Protocol (EIGRP). Examine the basic EIGRP configuration commands and identify their purposes. Calculate the composite metric used by EIGRP. Describe the concepts and operation of DUAL. Describe the uses of additional configuration commands in EIGRP. Introduction EIGRP Roots of EIGRP: IGRP Developed in 1985 to overcome RIPv1’s limited hop count Distance vector routing protocol Metrics used by IGRP Bandwidth (used by default) Delay (used by default) Reliability Load Discontinued support starting with IOS (13)T & (R1s4)S EIGRP EIGRP Message Format EIGRP Header Data link frame header - contains source and destination MAC address IP packet header - contains source & destination IP address EIGRP packet header - contains AS number Type/Length/Field - data portion of EIGRP message EIGRP EIGRP packet header contains: Opcode field Autonomous System number | EIGRP Routing Protocols and Concepts – Chapter 9 Objectives Describe the background and history of Enhanced Interior Gateway Routing Protocol (EIGRP). Examine the basic EIGRP configuration commands and identify their purposes. Calculate the composite metric used by EIGRP. Describe the concepts and operation of DUAL. Describe the uses of additional configuration commands in EIGRP. Introduction EIGRP Roots of EIGRP: IGRP Developed in 1985 to overcome RIPv1’s limited hop count Distance vector routing protocol Metrics used by IGRP Bandwidth (used by default) Delay (used by default) Reliability Load Discontinued support starting with IOS (13)T & (R1s4)S EIGRP EIGRP Message Format EIGRP Header Data link frame header - contains source and destination MAC address IP packet header - contains source & destination IP address EIGRP packet header - contains AS number Type/Length/Field - data portion of EIGRP message EIGRP EIGRP packet header contains: Opcode field Autonomous System number EIGRP Parameters contain: Weights Hold time EIGRP TLV: IP internal contains Metric field Subnet mask field Destination field TLV: IP external contains Fields used when external routes are imported into EIGRP routing process EIGRP Protocol Dependent Modules (PDM) EIGRP uses PDM to route several different protocols . IP, IPX & AppleTalk PDMs are responsible for the specific routing task for each network layer protocol EIGRP Reliable Transport Protocol (RTP) Purpose of RTP Used by EIGRP to transmit and receive EIGRP packets Characteristics of RTP Involves both reliable & unreliable delivery of EIGRP packet Reliable delivery requires acknowledgment from destination Unreliable delivery does not require an acknowledgement from destination Packets can be sent Unicast Multicast Using address EIGRP EIGRP’s 5 Packet Types Hello packets Used to discover & form adjacencies with neighbors EIGRP Update packets Used to propagate routing information EIGRP Query packets Used by DUAL for .