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Difference between EIGRP and OSPF.

Hi Friends,

Today I am going to write about the Difference between EIGRP and OSPF, One of the questions I have seen asked in the CCNA, CCNP interview.

What is the Difference between EIGRP and OSPF?

So first you should know the basics after that the main answer will come.


  • Eigrp stands for Enhanced interior gateway routing protocol
  • It uses dual ( diffuse update algorithm ) for reliability and choosing backup paths
  • It is a Hybrid Protocol which is also known as? Advance distance vector protocol ( Combination of Distance Vector & Link state protocols )
  • Administrative distance = internal (90) external (170) ( External Routes when the routes Redistributed in EIGRP it shows ad value 170 in Routing table )
  • Eigrp is now an open standard, Cisco Made it open standard in Year 2013.

There any many things which are in the basics of EIGRP.


  • OSPF stands for Open Shortest Path First
  • It?s a link state protocol
  • It uses SPF (shortest path first) ?Hello 10 sec’s hold down timer 40 sec’s Dijkstra’s algorithm
  • Metric is cost (cost=10 ^8/B.W.)
  • Administrative distance is 110
  • Mostly used in Interior gateway protocols.

Common Features

  • Both are? classless routing protocol
  • Both supports VLSM and CIDR
  • Both Open Standard
  • Supports Authentication
  • Faster convergence
  • Trigger/Incremental updates



  1. Maximum 255 hops, Default is 100
  2. Eigrp Doesn?t have a concept of Areas.
  3. Eigrp Knows what its neighbour knows ( this is also known as Routing by Rumor )
  4. It supports both equal cost load balancing & Unequal load balancing.
  5. Supports Multiple Protocols IP, IPX, Appletalk
  6. Hello 5 sec’s dead timer 15 sec’s
  1. Unlimited hop count
  2. Introduces the concept of Area?s to ease management and control traffic
  3. OSPF knows all the Network Topology Like GPS System knows all the paths.
  4. It supports only equal cost load balancing
  5. Support the Only IP
  6. Hello 10 sec’s dead timer 40 sec’s

Unequal load balancing means if you have two paths going to the same destination with different Cost you can also use the high-cost way.

We provide CCNA Online Training in USA?too.


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