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25: Enhanced Interior Gateway Routing Protocol
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Overview
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This chapter examines routing with Enhanced Interior Gateway Routing Protocol (EIGRP) EIGRP is a balanced-hybrid routing protocol that improves on many of IGRP's shortcomings in enterprise networks, including the following:
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Reduced overhead EIGRP reduces the network and router overhead needed for routing updates by multicasting routing updates, sending a routing update only when a change is detected (rather than sending the entire table periodically), updating only the routers that need to be aware of a topology change, and sending changes only to the routing table (rather than the entire table) when an update is necessary Support for VLSM and CIDR EIGRP includes the subnet mask in routing updates, allowing EIGRP to be used in VLSM scenarios Support for discontiguous networks Support for manual route summarization
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Extremely short convergence times Due to EIGRP's update algorithm, when a change occurs, EIGRP can achieve convergence in a matter of seconds in most reliable, welldesigned networks Loop-free topology generation Support for multiple network protocols including IP, IPX, and AppleTalk (Due to the need for brevity, however, only the IP version of EIGRP is discussed in this book)
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Like IGRP, EIGRP is a Cisco proprietary protocol EIGRP is one of the most common interior gateway protocols (IGPs) in use today in large, rapidly changing networks In fact, the benefits of EIGRP are so great in these environments that many companies have changed from some other vendor's routers to Cisco routers just to be able to use EIGRP Although EIGRP is necessarily more complex than RIP or IGRP, it is less complex than OSPF, which (normally) makes EIGRP easier to implement than OSPF
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How EIGRP Works
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Contrary to its name, EIGRP is very different from IGRP In fact, about the only aspects EIGRP and IGRP have in common are their metric calculation (and even that is a bit different) and their use of autonomous systems (ASs) Whereas IGRP uses a distance vector algorithm for updates, EIGRP uses a balanced-hybrid algorithm known as the Diffusing Update Algorithm (DUAL) DUAL is the defining trait of EIGRP; and although it is not dedicated a specific section in this chapter, DUAL operation is explained throughout the entire discussion of EIGRP The following discussion breaks EIGRP operation down into these components:
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Operational overview Terminology reference Operation Summarization Load balancing
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This section discusses EIGRP's basic operational procedures in a fairly nontechnical (and nonspecific) manner to ease you into its unique method of finding, selecting, and maintaining routes Although DUAL takes a little getting used to, it isn't extremely complicated First, routers maintain three tables to hold information: the Neighbor table, the Topology table, and the Routing table Upon bootup, the routers actively seek out neighbors (directly connected routers) and add them to the neighbor table The route also transfers its entire routing table to its new neighbors Rather than just picking a path or two and entering them into its routing table, however, at this point, EIGRP adds to the topology table all downstream routes to the destination (routes through routers that are closer to the destination than the local router) From the topology table, it then chooses one or more routes as the "best" routes to the destination (based on the route metrics) If a topology change occurs, the routers closest to the
topology change look in their topology table for an alternate route to the destination If one is found, they begin using the route and update their upstream neighbors on the change to the route If an alternate route is not found in the topology table, the router queries its neighbors for a new route The neighbors look in their topology tables, attempt to find an alternate route, and reply with any information they have available If no alternate route is listed in their topology tables, they query their neighbors, and so on Basically, as mentioned in 22, although EIGRP does keep some information on the network topology, it doesn't have to keep an entire map of the topology because it has enough sense to ask for directions
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