![]() Both are interior gateway protocols, so they are confined to a single routing domain. There are a few similarities between the two protocols. Table 1 shows a summary of some of the differences between EIGRP and OSPF.ĭiscussion of Differences Between EIGRP and OSPF Summary of Differences Between EIGRP and OSPF It can be passed transparently throughout the AS. The external routing information is kept separate from the OSPF link-state data. They also have summarized information about the other areas. The routers from an area have identical link-state databases. The OSPF AS can be a single area or divided into multiple areas. Each router running OSPF floods link-state information about its attached interfaces and metrics to inform other routers.Īs with EIGRP, OSPF is confined to an autonomous system, which is a single routing domain. The route calculation performed on the link-state information uses the shortest path first (SPF) algorithm. OSPF is a link-state routing protocol that uses link-state advertisements for network destinations. The idea of an AS is the same, but the implementation used by each protocol is different. If you have multiple EIGRP autonomous systems, the only way to share information between those systems is using redistribution.īGP on the other hand is able to exchange information within the same AS using iBGP, and between ASes using eBGP. You must configure the autonomous number of the EIGRP instance running on each EIGRP router, and it must be the same in order for the routers to become neighbors. Practically, that means that only EIGRP routers in the same autonomous system will exchange EIGRP information. An autonomous system in EIGRP is a collection of EIGRP routers that fall under a single administrative authority. It is important to remember that “autonomous system” in an EIGRP context is slightly different from the BGP use of that term. The routers exchange routing information only using the same metric calculation formula. Each AS represents a common routing domain.Įach EIGRP-speaking router calculating network paths uses several metrics. Every process operates in the Autonomous System (AS) context. Its “secret sauce” is the diffusing update algorithm (DUAL), which identifies network paths and provides fast reconvergence using loop-free backup paths.Ī router can run multiple EIGRP processes. EIGRP provides unequal-cost load balancing and rapid convergence. EIGRPĮIGRP is an enhanced version of IGRP (as the name says) and was, until recently, a Cisco proprietary routing protocol. In this article, we will be reviewing these two protocols, including the differences between them and the configuration of networks using these protocols. Two of the most popular routing protocols used today are Enhanced Interior Gateway Routing Protocol (EIGRP) and Open Shortest Path First (OSPF). There are several routing protocols to choose from, each with its own pros and cons, as each routing protocol is designed to be well suited to a particular network implementation scenario. ![]() Includes clear text, MD5, and SHA.Routing protocols are used to automatically and dynamically exchange routing information between routers. ![]() You can summarize inter-area routes or external routes at the ASBR. It carries subnet information, including information about discontiguous networks, in routing updates. ![]() It uses multicast address 224.0.0.5 for all OSPF routers and 224.0.0.6 for DR and BDR routers. When changes occur, only specific updates are propagated to the routers in the area. (All routers maintain a copy of this information.) Once converged, it uses keepalives to maintain adjacencies and does not send routing updates unless there are changes in the topology. All neighbors in an area exchange full database (link-state) information when relationships are built. Is highly scalable and converges quickly.(OSPFv2 is used for IPv4, and OSPFv3 is used for IPv6.) It is defined by the IETF Open Standard RFC 2328. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |