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EIGRP

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 Enhanced Interior Gateway Routing Protocol     EIGRP EIGRP  is a Cisco protocol that runs on Cisco  routers and on some Cisco switches.   EIGRP is a Cisco-proprietary Hybrid routing protocol, incorporating  features of both Distance-Vector and Link-State routing protocols.    EIGRP Features and Operations    (i)   EIGRP uses Diffusing Update Algorithm (DUAL) to determine the  best path among all “feasible” paths. DUAL also helps ensure a loopfree routing environment.    (ii)  EIGRP will form neighbor relationships with adjacent routers in the  same Autonomous System (AS) .    (iii) EIGRP traffic is either sent as unicasts, or as multicasts on address  224.0.0.1  depending on the EIGRP packet type.    (iv) Reliable Transport Protocol (RTP) is used to ensure delivery of most  EIGRP packets. (v)   EIGRP routers do not send periodic, full-table routing update...
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OSPF

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             Open Shortest Path First  1. OSPF is a standardized Link-State routing protocol, designed to scale efficiently to support larger networks.  2.  OSPF employs a hierarchical network which is work on  Areas basis .   3.  OSPF sends updates (LSAs) when there is a change to one of its links,  and will only send the change in the update. LSAs are additionally  refreshed every 30 minutes . 4. Instead of advertising the distance to connected networks, OSPF advertises the status of directly connected links using Link-State Advertisements (LSAs).  5.  OSPF form neighbor relationships with adjacent routers in the  same Area . 6.  OSPF is a classless protocol, and thus supports VLSMs. 7.  OSPF uses the Dijkstra Shortest Path First algorithm to determine  the shortest path. 8.  OSPF traffic is multicast either to address 224.0.0.5 ( all OSPF  routers) or 224.0.0.6 ...
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