Submitted by: Submitted by ddd1019
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Date Submitted: 05/05/2013 05:11 PM
What is the difference between EIGRP and OSPF?
· OSPF is able to load balance in equal cost paths, and EIGRP can load balance between unequal cost paths, which is a specialty of EIGRP.
· EIGRP shows characteristics of both link state and distance vector protocol, but OSPF is merely a link state protocol.
· OSPF calculates the metric using cost, but EIGRP uses bandwidth, load, delay and reliability to calculate the metric. Metric is used to select the best route to reach a subnet, and lower metric is also considered to be better.
· As a link state protocol, OSPF converges quicker than EIGRP, also OSPF can be used in larger networks.
· Neighbor relationship is simpler in EIGRP than OSPF topology
OSPF and EIGRP Concepts and Configuration
Things to Remember about Link State Routing
* Link state protocols advertise a large amount of topological information about the network (tells what every metric is for every link in the network)
* Routers must calculate the metric (using Shortest path First Algorithm)
* Routers perform CPU intensive computations on the data.
* Discover neighbors before exchanging information.
* Summary of Distance Vector and Link State
Feature | Link State | Distance Vector |
Convergence Time | Fast | Slow (loop avoidance features) |
Loop avoidance | Built into protocol | Extra features such as route poisoning, split horizon |
Memory/CPU | Can be large; good design can minimize | Low |
Requires design effort for large networks | Yes | No |
Public/Proprietary? | OSPF = public | RIP = public
IGRP = Cisco proprietary |
Balanced Hybrid Routing Protocol/EIGRP Concepts
EIGRP has some features that act like distance vector protocols, and some that act like link-state protocols.
Feature Comparison with IGRP:
Similarities | Differences |
Both Cisco proprietary | EIGRP converges faster |
Same logic for equal-cost paths | EIGRP sends routing info once to neighbor, then again only when update occurs.
IGRP...