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Topic: Enhanced Interior Gateway Routing Protocol

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	Enhanced Interior Gateway Routing Protocol - Wikipedia, the free encyclopedia
		EIGRP is a balanced hybrid IP routing protocol, with optimizations to minimize both the routing instability incurred after topology changes, as well as the use of bandwidth and processing power in the router.
		Routing table: Stores the actual routes to all destinations; routes may be marked either as "Passive", which is the normal state when the routing has stabilized, or "Active" when the topology has changed, and the router is in the process of updating its route to that destination.
		EIGRP is able to deal with classless interdomain routing allowing the use of VLSM which is its main advantage over its predecessor.
	en.wikipedia.org /wiki/Enhanced_Interior_Gateway_Routing_Protocol (479 words)

	Communications protocol - Wikipedia, the free encyclopedia
		An example of a simple communications protocol adapted to voice communication is the case of a radio dispatcher talking to mobile stations.
		Protocol layering accomplishes these objectives by dividing the protocol design into a number of smaller parts, each of which performs closely related sub-tasks, and interacts with other layers of the protocol only in a small number of well-defined ways.
		Protocol layering allows the parts of a protocol to be designed and tested without a combinatorial explosion of cases, keeping each design relatively simple.
	www.sciencedaily.com /encyclopedia/communications_protocol (1160 words)

	EIGRP - a Whatis.com definition
		EIGRP (Enhanced Interior Gateway Routing Protocol) is a network protocol that lets routers exchange information more efficiently than with earlier network protocols.
		EIGRP evolved from IGRP (Interior Gateway Routing Protocol) and routers using either EIGRP and IGRP can interoperate because the metric (criteria used for selecting a route) used with one protocol can be translated into the metrics of the other protocol.
		If it can't find a route to a destination in one of these tables, it queries its neighbors for a route and they in turn query their neighbors until a route is found.
	whatis.techtarget.com /gDefinition/0,294236,sid7_gci214442,00.html (292 words)

	Enhanced Interior Gateway Routing Protocol (EIGRP)
		Enhanced IGRP relies on four fundamental concepts: neighbor tables, topology tables, route states, and route tagging.
		Route tagging is particularly useful in transit ASs, where Enhanced IGRP typically interacts with an interdomain routing protocol that implements more global policies, resulting in a very scalable, policy-based routing.
		External routes are tagged with information that identifies their origin.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/en_igrp.htm (2081 words)

	IP Routing: Chapter 4: Enhanced Interior Gateway Routing Protocol (EIGRP) (Site not responding. Last check: 2007-10-13)
		EIGRP differs in that it saves not only the best (least-cost) route but all routes, allowing convergence to be much quicker.
		When a route is lost, the updates stop; the invalid and flush timers grow and grow (the timers are not reset), and, ultimately, the route is flushed from the routing table.
		A route is regarded as stuck-in-active (SIA) when DUAL does not receive a response to a query from a neighbor for three minutes, which is the default value of the active timer.
	www.oreilly.com /catalog/iprouting/chapter/ch04.html (6394 words)

	Interior Gateway Protocols
		Intra-area routing occurs when the source and destination are in the same area; inter area routing occurs when they are in different areas.
		When changes to the routing table are detected, the BGP routers send to their neighbors only those routes that have changed.
		Routes learned via BGP have associated properties that are used to determine the best route to a destination when multiple paths exist to a particular destination.
	www.bridgeport.edu /sed/projects/cs597/Fall_2001/msaleem/ProjectReport.htm (5935 words)

	Cisco - Enhanced Interior Gateway Routing Protocol
		EIGRP is an enhanced distance vector protocol, relying on the Diffused Update Algorithm (DUAL) to calculate the shortest path to a destination within a network.
		EIGRP, instead of counting on full periodic updates to re-converge, builds a topology table from each of its neighbor's advertisements (rather than discarding the data), and converges by either looking for a likely loop-free route in the topology table, or, if it knows of no other route, by querying its neighbors.
		EIGRP avoids this congestion by pacing the speed at which packets are transmitted on a network, thereby using only a portion of the available bandwidth.
	www.cisco.com /warp/public/103/eigrp-toc.html (9255 words)

	IGRP (Interior Gateway Routing Protocol) (Linktionary term)
		An interior routing protocol is meant to be used inside an autonomous system (an organization's private network) while an exterior routing protocol operated between autonomous systems.
		EIGRP is a distance-vector routing protocol similar to IGRP, but with many enhancements.
		When routers add entries to routing tables, 1 is added to the hop count to account for the hop between the router and the neighbor from which it received the route information.
	www.linktionary.com /i/igrp.html (846 words)

	Interior Gateway Routing Protocol and Enhanced IGRP
		The Interior Gateway Routing Protocol (IGRP) is a routing protocol developed in the mid-1980s by Cisco Systems, Inc. Cisco's principal goal in creating IGRP was to provide a robust protocol for routing within an autonomous system (AS) having arbitrarily complex topology and consisting of media with diverse bandwidth and delay characteristics.
		Distance vector routing protocols call for each router to send all or a portion of its routing table in a routing update message at regular intervals to each of its neighboring routers.
		Distance vector routing protocols are often contrasted with link state routing protocols, which send local connection information to all nodes in the internetwork.
	www.ba-stuttgart.de /~schulte/htme/55182.htm (2659 words)

	Untitled Document
		Enhanced Interior Gateway Routing Protocol (EIGRP) or Enhanced IGRP is a Cisco proprietary routing protocol utilizing the Diffusing Update Algorithm (DUAL).
		EIGRP is a hybrid protocol as it incorporates features of a Distance Vector routing protocol and features of a Link State routing protocol.
		EIGRP can redistribute its routes (and metrics) intoother routing protocols and accepts redistribution from other routing protocols as well.
	www.inetdaemon.com /tutorials/internet/ip/routing/eigrp/index.shtml (686 words)

	Cisco Sem3 Lesson 5 - IGRP
		routing table entry (manually defined by the system administrator) that is used to direct frames for which a next hop is not explicitly listed in the routing table.
		Link state algorithms create a consistent view of the network and are therefore not prone to routing loops, but they achieve this at the cost of relatively greater computational difficulty and more widespread traffic (compared with distance vector routing algorithms).
		The algorithm used to calculate the routing metric for IGRP is also shown as well as information about routing metrics (like hop count) and routing filters.
	www.tele.sunyit.edu /HALF_REVIEW/5IGRP.htm (1341 words)

	Cisco EIGRP: Enhanced Interior Gateway Routing Protocol Overview
		IGRP is Cisco's Interior Gateway Routing Protocol used in TCP/IP and OSI internets.
		It is regarded as an interior gateway protocol (IGP) but has also been used extensively as an exterior gateway protocol for inter-domain routing.
		The support of EIGRP for variable-length subnet masks permits routes to be automatically summarized on a network number boundary.
	www.javvin.com /protocolEIGRP.html (330 words)

	IP Routing Primer: Part Four \| Full Story \| November 27, 2000
		Unlike RIP, OSPF is a link-state routing protocol, which means that routing changes are based on the status and speeds of the physical links in the networked routers.
		It's important to note that a link-state database is distinct from a routing table.
		EIGRP calls the next router in the path toward a network destination a "successor." It also keeps track of the next-hop routers that can provide loop-free backup routes, which it calls "feasible successors." This information is tracked in a topology table.
	www.networkcomputing.com /netdesign/iprpart4.html (1110 words)

	SecuriTeam™ - Authenticated EIGRP DoS and Information Disclosure
		A goodbye message is sent when an EIGRP routing process is shutting down to tell the neighbors about the impending topology change to speed up the convergence.
		Of course, on an unprotected EIGRP domain there is a much simpler way of traffic redirection, which is either directly injecting the routes using our packet generator or establishing a fake neighborhood and supplying metric parameters to the legitimate peers, which would lead DUAL to favor the fake neighbor.
		From a position within an EIGRP authenticated AS where it is possible to receive/listen to EIGRP Hello Updates, it is possible, with reply attacks, to forge illegitimate hello packets in an authenticated AS.
	www.securiteam.com /securitynews/6I00L00EUW.html (1905 words)

	What is Enhanced Interior Gateway Routing Protocol? - A Word Definition From the Webopedia Computer Dictionary
		Abbreviated as EIGRP, an evolved version of IGRP that addresses the demands of large-scale internetworks and the changes in network technology that have been developed since the implementation of IGRP.
		Routers that already use IGRP can use EIGRP because the metrics for both protocols are directly translatable, i.e., they are as easily comparable as if they were routes that originated in their own autonomous systems.
		Unlike some earlier routing protocols that would send an entire table to neighboring routers when one routing table entry changed, EIGRP notifies the neighbors of only the specific change in the table.
	www.webopedia.com /TERM/E/Enhanced_Interior_Gateway_Routing_Protocol.html (187 words)

	Packet Design monitors EIGRP
		Distance-vector routing protocols call for each router to send all or a portion of its routing table in a routing-update message at regular intervals to each of its neighboring routers.
		Route Explorer can spot, for example, that a downed link will break the only path to a given prefix because redundant routing is incorrectly configured.
		Pricing for Route Explorer begins at $19,000 and scales to $90,000 or so, based on the size of the network and the type of protocols to be monitored.
	www.networkworld.com /newsletters/accel/2004/0301netop1.html?fsrc=rss-cisco (1002 words)

	Cisco administration 101: What you need to know about EIGRP
		Enhanced Interior Gateway Routing Protocol (EIGRP) is one of the most popular internal routing protocols used by midsize and large companies.
		Both of these routing protocols offer a huge breadth of features that can cover just about any routing scenario that a midsize or large company would require.
		EIGRP uses the Diffusing-Update Algorithm (DUAL) to perform look-free routing and calculate the shortest path.
	techrepublic.com.com /5100-1035_11-5885607.html?part=rss&tag=feed&subj=tr (875 words)

	Toggit Certification Home for MCSE CCNA A+ study guides and test prep
		The process of inserting the frame header and data from a higherlevel protocol into the data frame of a lower-level protocol.
		EIGRP improves performance by using information derived from distance-vector protocols, but also includes an algorithm for removing transient loops in possible routes, which reduces the complexity of the calculations required.
		Some programs or transmission protocols simply request a retransmission of the affected block of data if an error is detected.
	www.toggit.com /Library/pedia/techno.asp?Term=e&Techno=Letter (4803 words)

	Building Scalable Cisco Internetworks Part 3 (Site not responding. Last check: 2007-10-13)
		• Identify the relationships between the Enhanced Interior Gateway Routing Protocol (EIGRP) database and the IP routing table.
		• Identify the requirements for configuring a default route for the Enhanced Interior Gateway Routing Protocol (EIGRP) process using the default-network command.
		• Identify considerations for limiting the Enhanced Interior Gateway Routing Protocol (EIGRP) query range by using the eigrp summarization commands.
	www.netg.com /globalcatalog/sg/detail.asp?c=UK20723&pStatus=A (798 words)

	KnowledgeConcept - Course Catalog
		The goal is to train network administrators to grow a dramatically increased number of routers/sites using these techniques instead of redesigning the network when additional sites or wiring configurations are added.
		Identify advanced IP routing principles including static and dynamic routing characteristics and the concepts of classless routing and network boundary summarization
		Routing protocol operation and configuration for Routing Information Protocol (RIP), Interior Gateway Routing Protocol (IGRP), Enhanced IGRP (EIGRP), and Open Shortest Path First (OSPF) single-area networks
	www.knowledgeconcept.net /courses/cisco/bscn.htm (380 words)

	Verizon preserves EIGRP routes over MPLS
		Verizon can preserve your EIGRP routes whether you manage your premises routers yourself or whether Verizon is providing you with a managed router service, says Mike Tighe, director of advanced data services at Verizon.
		He observes, though, that the EIGRP service is most in demand where the customer is managing the router, since it's a bigger headache for customers to deal with BGP when configuring and maintaining WAN-edge routers themselves.
		In Cisco-centric shops, EIGRP is compelling as a routing option to MPLS-based IP VPNs because enterprises only have to configure their WAN routers for one protocol, their networks are easier to troubleshoot, and the likelihood of traffic taking the most efficient path is greater, Tighe says.
	www.networkworld.com /newsletters/frame/2005/0131wan1.html?fsrc=rss-mpls (1132 words)

	Interconnecting Cisco Networking Devices Part 2 (Site not responding. Last check: 2007-10-13)
		It describes the features, operation, and configuration of Routing Information Protocol (RIP), Interior Gateway Routing Protocol (IGRP), Enhanced Interior Gateway Routing Protocol (EIGRP), and Open Shortest Path First (OSPF) routing protocols.
		• Identify routing entities in a link-state hierarchy.
		• Identify commands for troubleshooting Interior Gateway Routing Protocol (IGRP) configuration.
	www.netg.com /globalcatalog/sg/detail.asp?c=UK20712&pStatus=A (552 words)

	EIGRP - Enhanced Interior Gateway Routing Protocol
		Provides superior convergence properties and operating efficiency, and combines the advantages of link state protocols with those of distance vector protocols.
		Every attempt has been made to provide you with the correct acronym for EIGRP.
		If we missed the mark, we would greatly appreciate your help by entering the correct or alternate meaning in the box below.
	www.auditmypc.com /acronym/EIGRP.asp (94 words)

	What is Interior Gateway Routing Protocol? - A Word Definition From the Webopedia Computer Dictionary
		IGRP is a distance-vector routing protocol, which means that each router sends all or a portion of its routing table in a routing message update at regular intervals to each of its neighboring routers.
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	www.webopedia.com /TERM/I/Interior_Gateway_Routing_Protocol.html (231 words)

	Cisco EIGRP: Enhanced Interior Gateway Routing Protocol Overview
		Type ¨C Value in the type field: 1 EIGRP Parameters.
		To get this Network Protocol Poster, click here.
		All commonly used network protocols fully explained and illustrated!
	www.networkdictionary.com /protocols/eigrp.php (429 words)

	Building Scalable Cisco Internetworks (BSCI) , School of Continuing Education, University of Wisconsin - Milwaukee (Site not responding. Last check: 2007-10-13)
		The course provides in-depth information on interior gateway protocols (IGPs), Enhanced Interior Gateway Routing Protocol (EIGRP), Open Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS).
		The course covers routing principles of both distance vector and link-state routing protocols; IP addressing techniques; the theory behind the EIGRP, OSPF, IS-IS, and BGP routing protocols; and configuration and troubleshooting information for each protocol.
		Hands-on lab exercises allow you to practice configuration and troubleshooting knowledge and to acquire the skills necessary to configure these protocols in customer networks.
	cfprod.imt.uwm.edu /sce/course.cfm?id=4264 (141 words)

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