eigrp ip fast reroute vs ospf ip fast reroute

#Eigrp ip fast reroute vs ospf ip fast reroute update
#Eigrp ip fast reroute vs ospf ip fast reroute full

Whenever there is any change in the area, all routers in that particular area are needed to recalculate their database and routes. On the other hand, OSPF is a link-state routing protocol which resembles a map where the complete information about all the routes within that area is maintained. Further, the incremental updates mean that the router will not send all the information about the network rather just the information that has changed will be shared. Here, the triggered updates signify that the router will not send updates until and unless something has changed. EIGRP is an advanced distance vector routing protocol which uses incremental and triggered updates.The type of information that is interchanged between the routers is cost, type of link and network information with other routers and this process is known as LSA (link-state advertisement) exchange. In link-state advertisements, each router shows itself and its links to the neighbours in a clear and understandable form, so that the OSPF can layout the network topology on the basis of the information from shortest-path tree. There is also the provision of authentication its two types are a plain test and message-digest algorithm 5.Īs it is mentioned above that the OSPF uses the Dijkstra algorithm in order to calculate the routes by generating the shortest path tree (SPT). To send Hello and updates it uses multicast addresses – 224.0.0.5 and 224.0.0.6. The OSPF is a classless routing protocol that also assists variable-length subnet masking (VLSM) and discontiguous networks. It has a reliable mechanism for transportation rather than having a transport protocol like TCP. OSPF uses protocol number 89 when it runs over the IP, similar to TCP which runs on the top of IP utilizes protocol number 6. The main idea behind the development of the OSPF protocol is to develop a link-state protocol which could provide more efficiency and scalability than RIP. OSPF (Open Shortest Path first) is also a routing protocol like EIGRP but it is an open IETF standard which can be used and deployed in a variety of networks. While, EIGRP is not aware of entire network connections, so it relies on its neighbour’s advertisement.

#Eigrp ip fast reroute vs ospf ip fast reroute full

The EIGRP does not send full periodic routing updates, that is the reason it has fast convergence time. If the convergence time is less the router can swiftly adapt the network topology change. The convergence time in a network is the time that is consumed for all the routers in the network to accept the network change.

#Eigrp ip fast reroute vs ospf ip fast reroute update

In the same way, EIGRP stores a topology table of the advertised routes and utilizes the Diffusing Update Algorithm (DUAL) in order to select a loop-free path as the link-state protocol.īefore understanding the convergence in the EIGRP we must understand what convergence is. Similar to the distance vector routing protocol, EIGRP receives its updates from its neighbours. It was devised to overcome the shortcomings of the classical distance vector routing protocols like IGRP and RIP which were hard to scale according to the needs of the network.ĮIGRP is considered as a hybrid because it merges the features of the distance vector routing and link-state routing protocol. Although, it is a complex protocol but we can configure and run it easily in small and large networks. It is used for sharing the information from one to the neighbouring routers which exist within the same area. Updates and queries as needed to a multicast addressįlooding as needed and periodically to a multicast addressĮIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco-based distance vector protocol which works on DUAL (Diffusing Update Algorithm). Content: EIGRP Vs OSPFĬombination of bandwidth, reliability, load and delay. On the other hand, OSPF is the open standards IGP for the enterprise network. Such as the EIGRP is Cisco proprietary IGP, which means it is only popular in Cisco networks only. However, the capability of EIGRP and OSPF to learn the dynamic routes for the network is functionally equivalent, but there are several differences between them.