Module 2- Lesson 1&2 – Introduction to EIGRP pptx

Configuring EIGRP BSCI Module 2- Lesson 1&2 – Introduction to EIGRP BSCI © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential CCNP – BSCI Bachkhoa Networking Academy Objectives  This module will cover topics which allow students to meet the following objectives: –Describe the key capabilities that distinguish EIGRP from other routing protocols –Identify the four key technologies employed by EIGRP –Describe how EIGRP operates –Describe the five components of the metric used by EIGRP –Calculate the EIGRP metric for a range of pathways between routers –Explain how IGRP routes are integrated into EIGRP routes and vice-versa BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com CCNP – BSCI Bachkhoa Networking Academy The Evolution of Dynamic Routing Protocols BSCI Học viện mạng Bach Khoa - Website: www.bkacad.com © 2008 Cisco Systems, Inc All rights reserved CCNP – BSCI Bachkhoa Networking Academy Dynamic Routing Protocols Classification BSCI Học viện mạng Bach Khoa - Website: www.bkacad.com © 2008 Cisco Systems, Inc All rights reserved CCNP – BSCI Bachkhoa Networking Academy IGP and EGP  An autonomous system (AS) - otherwise known as a routing domain - is a collection of routers under a common administration  Two types of routing protocols are: interior and exterior routing protocols –Interior Gateway Protocols (IGP) are used for intra-autonomous system routing - routing inside an autonomous system –Exterior Gateway Protocols (EGP) are used for interautonomous system routing - routing between autonomous systems BSCI Học viện mạng Bach Khoa - Website: www.bkacad.com © 2008 Cisco Systems, Inc All rights reserved CCNP – BSCI Bachkhoa Networking Academy Distance Vector and Link State  Interior Gateway Protocols (IGPs) can be classified as two types: –Distance vector routing protocols –Link-state routing protocols Distance Vector Routing Protocol Operation  Distance vector means that routes are advertised as vectors of distance and direction –Distance is defined in terms of a metric such as hop count –Direction is simply the next-hop router or exit interface –Algorithm is Bellman-Ford BSCI Học viện mạng Bach Khoa - Website: www.bkacad.com © 2008 Cisco Systems, Inc All rights reserved CCNP – BSCI Bachkhoa Networking Academy Distance Vector and Link State  Distance Vector Routing Protocol Features: –The network is simple and flat and does not require a special hierarchical design –The administrators not have enough knowledge to configure and troubleshoot link-state protocols –Specific types of networks, such as hub-and-spoke networks, are being implemented –Worst-case convergence times in a network are not a concern BSCI Học viện mạng Bach Khoa - Website: www.bkacad.com © 2008 Cisco Systems, Inc All rights reserved CCNP – BSCI Bachkhoa Networking Academy Distance Vector and Link State Link-state Protocol Operation  A link-state router uses the link-state information to create a topology map and to select the best path to all destination networks in the topology  Link-state protocols Features: –The network design is hierarchical, usually occurring in large networks –The administrators have a good knowledge of the implemented linkstate routing protocol –Fast convergence of the network is crucial BSCI Học viện mạng Bach Khoa - Website: www.bkacad.com © 2008 Cisco Systems, Inc All rights reserved CCNP – BSCI Bachkhoa Networking Academy Purpose of this Lesson Coverage of topics new to the “EIGRP” module of BSCI  What’s new in this module? –EIGRP metric calculations for pathway ranges between routers BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com CCNP – BSCI Bachkhoa Networking Academy EIGRP Features There are several key differences with EIGRP from other routing protocols which are explored in this module Hybrid Cisco Routing Protocol Fast convergecen VLSM & Discontigous: Classless Routing Protocol Partial Updates Multiple L3 protocol: IP, IPX, Apple Talk BSCI Composite Metric viện mạng Bách Khoa - www.bkacad.com Học © 2008 Cisco Systems, Inc All rights reserved 10 CCNP – BSCI Bachkhoa Networking Academy Example: EIGRP Tables Router C’s tables: BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 31 CCNP – BSCI Bachkhoa Networking Academy EIGRP Packets  Hello: Establish neighbor relationships  Update: Send routing updates  Query: Ask neighbors about routing information  Reply: Respond to query about routing information  ACK: Acknowledge a reliable packet BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 32 CCNP – BSCI Bachkhoa Networking Academy Establishing Adjacencies with Neighbors  EIGRP routers establish adjacencies with neighbor routers by using small hello packets  Hellos are sent every 5s(BW>1,544M) and 60s(BW=