Interior and exterior routing o interior routing n routing inside an autonomous system n each as can chose its own interior routing protocol n examples. Uses interior gateway protocols as routing protocols. Interior gateway protocols can be divided into two categories. The routing protocols are implemented in the network layer of the model, providing the set of rules for devices to route data packets towards the destination. Bgp supports policybased routing, which uses nontechnical reasons for example, political, organizational, or security considerations to make routing decisions. For a more enjoyable learning experience, we recommend that you study the mobilefriendly republished version of. Exterior gateway protocol egp is a routing protocol which is used to find network path information between different networks. Learn which type of protocol is best used in the parts of your topology.
It was introduced in 1834, replacing the piastre, which continued to circulate at a value of 1% of a pound. Exterior gateway protocols are routing protocols used on the internet for exchanging routing information between autonomous systems, such as border gateway protocol bgp, path vector routing protocol. Comparison of rip, eigrp, ospf, igrp routing protocols in. In this video, russ walks through the difference between interior and exterior routing protocols. This means that all your routers must be cisco routers in order to use igrp in your network, keep in mind that windows 2000 now supports it as well because they have bought a licence from cisco to use the protocol. Figure 31 shows a timeline of ip routing protocols, with a chart that helps classify the various protocols. Wireless local area network provides high speed data transmission which can be accessed from any location. Exterior gateway protocols should not be confused with exterior gateway protocol egp, an obsolete routing protocol. Rfc904 is the specification of the exterior gateway protocol egp.
While igp protocols are used within local networks, exterior gateway protocols egp are used for routing between networks, generally on the internet backbone itself, linking the different networks together. Some gateway of each autonomous system must exchange routing information with some gateway of the core autonomous. Enhanced interior gateway routing protocol eigrp is an evolved version of igrp that addresses the demands of largescale 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. Interior and exterior gateway protocols dynamic routing.
Ospf, rip interdomain as2 interior router bgp router interdomain routing protocol aka exterior gateway protocol egp, e. Exterior protocols make the exact opposite assumption. Igrp represented a substantial improvement over rip, but like any successful company, cisco was not content. Intradomain routing protocol aka interior gateway protocol igp, e. Instructor so we learned about distance vectorand link state. The term exterior routing protocol has no abbreviation in common use, so we shall use the abbreviation egp as is usual in tcpip literature.
Exterior routing protocol financial definition of exterior. Eigrp adheres to the following hybrid characteristics. It is a classful distance vector protocol with a metric based on bandwidth and delay. It will usually publish the whole 20, two 119 or perhaps down to 18 blocks to the external world. Performance analysis of enhanced interior gateway routing. These higherlevel areas are called autonomous systems in the ip world and routing domains in the iso world. Every gateway must be a member of some autonomous system. Afterward, it was formally pegged to the british pound until 1962, when the peg switched to the u. Exterior gateway protocols egp if the postman sitting in the center of the united states received letters from san francisco, he would find that letters from san francisco arriving from channels to the west would come in with later cancellation dates than if such letters had arrived in a roundabout manner from the east. May 15, 2014 interior protocols assume that there is a single manager, with a single purpose and no competing policies that have to be managed. The protocol ensures that every router has routing. Bgp pdf created with fineprint pdffactory pro trial version. An interior gateway protocol is a routing protocol that is used within the routers of one autonomous system. Some gateway of each autonomous system must exchange routing information with some gateway of the core autonomous system using the exterior gateway protocol.
Interior gateway protocols and exterior gateway protocols. Interior gateway protocol simple english wikipedia, the. How to configure interior gateway routing protocol igrp. As a result, interior protocols can do things like assume g. Rfc 890 exterior gateway protocol implementation schedule. Applications like video conferencing, voice chatting, file transferring can be done in wireless local area network with high transmission speed 1, 7. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Rip and ospf o exterior routing n routing between autonomous systems n only one exterior routing protocol is usually used for exterior routing n examples. Two kinds of routing protocols are used for internal and external network communication, namely, interior gateway protocols igp and exterior gateway protocols egp. The tcpip guide enhanced interior gateway routing protocol. Why is cisco opening up enhanced interior gateway routing protocol eigrp.
Thus bgp enhances an autonomous systems ability to. No one tool is going to solve all routing problems. The routing protocols used to facilitate the exchange of routing information between routers within an as are called interior routing protocols or historically. Routing protocols are divided into two general groups. Although many organizations have migrated to more recent routing protocols such as enhanced interior gateway routing protocol eigrp and open shortest path first ospf, many of the earlier routing protocols, such as routing. The current implementation of igrp handles routing for tcpip.
However, the basic design is intended to be able to handle a variety of protocols. Another two categories of dynamic routing protocolsyou should pay attention to are interior versusexterior protocols. Areas introduce a hierarchy to the internetwork architecture. A comparative study of igp and egp routing protocols. The protocols are utilized to keep track of getting between destinations to other side of a network or to administrate the networks. These routing protocol differ in various like convergence, throughput, jitter delay and rout establishment ii.
Interior protocols assume that there is a single manager, with a single purpose and no competing policies that have to be managed. Learn with alison in this online networking course the structure and function of wide area networks, network security and services. We discuss what is met by advanced distance vector routing protocol and explain the concepts of nonperiodic, partial and bounded. Rights this slide set is the ownership of the 6diss project via its. Tcpip interior routing protocols rip, ospf, ggp, hello.
Interior gateway routing protocol igrp is a proprietary distance vector routing protocol used to communicate routing information within a host network. Interior gateway routing protocol igrp is a cisco proprietary distancevector routing protocol. This memo is a policy statement on the implementation of the exterior gateway protocol in the internet. This is an official policy statement of iccb and darpa. What are the differences between interior and exterior. Exterior gateway protocols are used to route packets between two autonomous systems. Related work many researchers in the past have compared the performance of these two dynamic routing protocols that is interior gateway routing protocol eigrp and open. Bgp is used by companies with more than one internet provider to allow them to have redundancy and load balancing of their data transported to and from the internet. Another layer is added to this hierarchical structure by grouping areas into larger areas. Information and translations of interior gateway protocol in the most comprehensive dictionary definitions resource on the web. The routing table contains a list of known routers, the addresses they can reach, and a cost metric associated with the path to. Protocols such as igrp are called internal gateway protocols igps. Networking explain interior and exterior routing protocols.
Enhanced interior gateway routing protocol eigrp is another cisco proprietary, hybrid has feature of distance vector and link state protocols, interior gateway protocol igp used by routers to exchange routing information. Since most network administrators are responsible for routers within a particular organization, these are the routing protocols you are most likely to deal. What is the interior gateway routing protocol igrp. Interior gateway protocols exterior gateway protocols classful classless ipv6 rip igrp egp bgpv4 bgpv4 for ipv6 eigrp ospfv2 ospfv3 isis for ipv6 isis eigrp for ipv6 ripv2 ripng highlighted routing protocols are the focus of this course. Igrp is based on the class of algorithms is to shortestpathfirstspf.
In order to perform a basic isis configuration, we need to understand levels, nsap addressing, and enabling an interface for isis. Exterior gateway protocol connect separate routing domains that contain independent routing policies as carries sequences of as numbers indicating path supports the same features and functionality as ipv4 bgp multiple addresses families. Routing protocols fall into two classifications, interior and exterior routing gateway protocols. Implication if you have a dumb gateway now, you should start doing something today to get it upgraded to, or replaced by, an egp gateway. Ciscos principal goal in creating igrp was to provide a robust protocol for routing within an autonomous system as. Aug 10, 2005 the current implementation of igrp handles routing for tcpip. Eigrp uses a composite metric composed of bandwidth, delay, reliability, and loading to determine the best path. Isis is broken into a hierarchy with two levelslevel 1 and level 2. What is eigrp enhanced interior gateway routing protocol. Single set of network is named as interior gateway protocol igrp some times the single set networks are to be connected with external gateway protocols. This is superior to rip, whose metric is based on hopcount. Interior gateway protocols rip, ospf interior gateway protocols rip and ospf what is routing.
This routing information can then be used to route networklayer protocols like ip interior gateway protocols can be divided into two categories. Although there are many types of routing protocols, three major classes are in widespread use on ip networks. So this is yet another way to classify thosedynamic routing protocols were learning about. Previous topic previous slide next slide next topic. It is based on the osi interdomain routing protocol idrp. It is used inside interior to an independent network system. The exterior gateway protocol egp is a routing protocol for the internet originally specified in 1982 by eric c.
Border gateway protocol bgp exterior gateway protocol egp. Tcpip interior routing protocols rip, ospf, ggp, hello, igrp, eigrp modern tcpip routing architecture groups routers into autonomous systems ases that are independently controlled by different organizations and companies. The following sections provide more information on the two common egp protocols. It is commonly used in the internet to exchange routing table information between two neighbor gateway hosts each with its own router in a network of autonomous systems. By contrast, an exterior gateway protocol is used to determine network reachability between autonomous systems and relies on igps to resolve routes within an as. Avoiding routing loops by preventing the routing path to be sentadvertised back to the node from which the advertising router has received it split horizon a routing loop resolution where a gateway node tells its neighbor gateways that one of the gateways is no longer connected by broadcasting a hop count of 16 back in the direction it. Dynamic routing protocols have evolved over several years to meet the demands of changing network requirements. Analysing performances of dynamic routing protocols on.
Egp is commonly used between hosts on the internet to exchange routing table information. Igp is distant vector protocol which uses hops to determine the best route for a data packet to. Ospf, rip interdomain as2 interior router bgp router interdomain routing protocol aka. Exterior routing protocols or exterior gateway protocols egps are used to exchange routing information between routers in different autonomous systems note. Switching from places to places between the routers, figure out. Interior gateway protocols are able to handle more complex network topologies, compared to exterior gateway protocols. Oct 09, 2014 interior gateway routing protocol igrp is a proprietary distance vector routing protocol used to communicate routing information within a host network. Level1 and level2 routers exist in groups called areas. There are also two types of dynamic routing protocols. After 1aug84 there shall be no dumb gateways in the internet. Now, they are not related, theyre completelydifferent categories versus dynamic and link state. Such protocols are known as interior gateway routing.
Border gateway protocol bgp is the leading exterior routing protocol of the internet. Which protocol is an exterior routing protocol and why. Interior gateway routing protocol background the interior gateway routing protocol igrp is a routing protocol that was developed in the mid1980s by cisco systems, inc. Interior gateway protocols type 2, distancevector routing protocols, such as routing information protocol, ripv2, igrp exterior gateway protocols are routing protocols used on the. Specific examples of igps include open shortest path first ospf, routing information protocol rip, intermediate system to intermediate system isis and enhanced interior gateway routing protocol eigrp. Ipv4, ipv6, unicast, multicast as z as x as y peering peering peering. Enhanced interior gateway routing protocol eigrp informational rfc frequently asked questions last updated. Exterior gateway protocol egp is a protocol for exchanging routing information between two neighbor gateway hosts each with its own router in a network of autonomous systems.
Exterior gateway protocol egp is an obsolete routing protocol that was used for data exchange between neighboring gateway hosts in autonomous systems. Packets used to send out lsas allow every router in the internetwork to share a common view of the topology of the internetwork a linkstate routing protocol floods, or multicasts, lsps to the network. Enhanced interior gateway routing protocol webopedia. Igrp manages the flow of routing information within connected routers in the host network or autonomous system. Activities include configuring routing on windows workstations and using wireshark to examine routing information protocol rip, open shortest path first ospf, enhanced interior gateway routing protocol eigrp, and border gateway protocol bgp network traffic. To ensure information is delivered to the correct destination at a reasonable level of performance forwarding given a forwarding table, move information from input. This lesson introduces routing and routing protocols. Short for enhanced interior gateway routing protocol, eigrp is a proprietary cisco protocol based on igrp that combines the advantages of. Igp interior gateway protocols are commonly made up of routing protocols. The routing protocols used to facilitate the exchange of routing information between routers within an as are called interior routing protocols or historically, interior gateway protocols. Between 1885 and 1914, the pound was effectively pegged to gold. Autonomous systems routing is handled by interior gateway protocols. Interior gateway protocols type 1, linkstate routing protocols, such as ospf and isis. Enhanced interior gateway routing protocol eigrp page 1 of 2 cisco systems, a leader in the world of internetworking and routing technology, developed the interior gateway routing protocol igrp in the mid1980s as an alternative protocol to rip for use in tcpip autonomous systems.
This rfc specifies an official protocol of the darpa community for use between gateways of different autonomous systems in the arpainternet. An interior gateway protocol igp is a type of protocol used for exchanging routing information between gateways commonly routers within an autonomous system for example, a system of corporate local area networks. In this paper, a study about the various routing protocols like enhanced interior gateway routing protocol eigrp, routing information protocol rip and open shortest path first ospf is done. Distancevector protocols use hop counts as the metric to determine best paths which are used for routing process.
Conventionally the routing problem is broken into several pieces. Interior gateway protocols rip, ospfinterior gateway protocols rip and ospf what is routing. Enhanced interior gateway routing in this lesson we introduce you to enhanced interior gateway routing, a proprietary cisco protocol. Egp was frequently used by research institutes, universities, government agencies and private organizations, but was replaced by border gateway protocol bgp. Exterior gateway protocols handle routing outside an autonomous system and get you from your network, through your internet providers network and onto any other network. Enhanced interior gateway routing protocol eigrp enhanced interior gateway routing protocol eigrp is a ciscoproprietary hybrid routing protocol, incorporating features of both distancevector and linkstate routing protocols. Definition of interior gateway protocol in the dictionary. An autonomous system might be one organisation, with its clients.
804 1288 1497 1386 1031 660 660 943 1134 706 1238 108 986 480 71 1050 800 160 574 255 1391 516 1206 522 1179 659 1447 218 1396 727 641 75