Topics: Routing, Routing protocol, Routing Information Protocol Pages: 4 (1135 words) Published: July 28, 2015
Jason Houlden
Table of a side by side comparison:

EIGRP forms adjacencies and exchanges routing updates with neighbors OSPF forms adjacencies with DR/BDROSPF can be more efficient than EIGRP for large meshed networks EIGRP uses metric based on bandwidth and delay

OSPF uses interface cost (inversely proportional to bandwidth)EIGRP may provide more flexibility in selecting best path EIGRP by default limits usage to at most 50% of link bandwidth in worst case OSPF uses 100% of link bandwidth when required EIGRP may be better suited for lower bandwidth WAN applications EIGRP provides feature velocity, but is Cisco-proprietary

OSPF is an Internet RFC standard
EIGRP sends hop-by-hop queries only when Feasible Successor cannot be found OSPF regularly syncs LSA database and floods network with topology change EIGRP can be more efficient by minimizing routing information exchanged EIGRP is a conceptually simpler routing protocol

OSPF’s rules for different types of areas and LSAs can be conceptually more difficult to understand Some customers believe EIGRP is easier to implement, but both are feature-rich and scalable EIGRP supports automatic summarization

OSPF’s requires manual summarization Care is needed in either case to ensure proper summarization! EIGRP supports both equal and unequal cost load sharing
OSPF only supports equal cost load sharing

Historical Information of OSPF:

In the early days of TCP/IP, the RIP became the standard protocol for routing within Internet Systems because of ease of use. RIP had two big things going for it: it was simple and easy to use, and it was included in the popular Berkeley Standard Distribution (BSD) of UNIX starting in 1982. Most organizations using TCP/IP started out with relatively small networks, and were able to use RIP with some degree of success. However, RIP had some serious issues as the networks began to grow larger. Many of these problems are due...

References: https://smbitsolutions.wordpress.com/2011/06/14/eigrp-or-ospf-which-one-should-i-use/
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