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Routing With IS-IS Protocol – Part 5 (IS-IS versus OSPF)

isis-topology-2

IS-IS Protocol and OSPF have some similarities and differences.

Lets firstly check the similarities of these two protocol one by one:

– IS-IS Protocol and OSPF are both Link-State Interior Gateway Protocols.
– IS-IS Protocol and OSPF are both uses Dijkstra SPF (Shortest Path First) algorithm.
– These protocols have LSDBs and the LSDB similar structure
– Both support VLSM (Variable Length Subnet Mask)
– Both are very scalable protocols
– Both has a fast convergence time after changes
– Both are open standards
– Both have hierarchical structures, there are two hierarchy level
– Both protocols support LANs and point-to-point protocols in similar ways
– Both protocol use periodic Hello messages for neighbour establishment

Now let’s check the differences of these two important protocols:

The other articles on IS-IS Protocol are below:

Routing With IS-IS Protocol – Part 1
Routing With IS-IS Protocol – Part 2 (IS-IS Addresses)
Routing With IS-IS Protocol – Part 3 (IS-IS Packet Types)
Routing With IS-IS Protocol – Part 4 (IS-IS Adjacency)
Routing With IS-IS Protocol – Part 5 (IS-IS versus OSPF)

IS-IS For IPv6 – IS-IS For IPv6 Overview
IS-IS For IPv6 – IS-IS For IPv6 Configuration on Cisco IOS

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