It would depend on the topology, if you had redundant paths (i.e. R1 -> R2 -> R3 -> R1) you would need to run a dynamic routing protocol in able to recover from a link failure. However if you have a simple string topology (R1 -> R2 -> R3) with no redundancy then static routing would be more than adequate.
You never know what the future network will look like. If you build even the simplist network to a flexible high standard, two or three years down the road, you are still building on a good foundation. To try and support and later convert a static network that has grown can be a daunting task.
Also, some technologies are not easily/not supported in a static network.
The most convincing argument is probably that a routing protocol can make the network change its routing in case of a failure. With statics, it is all or nothing. So I would prefer using a routing protocol whenever possible.
The technologies that I would consider hard to implement in a static network would be any of the dynamic fail over technologies... backup interface, dialer watch, HSRP. This is not to say they can not be done, just I would consider it more difficult.
Plus as the network expands, keeping track of all the statics could become a bear.
The poster was correct, IGRP is Cisco proprietary. OSPF, RIP2, IS-IS could be used as routing protocols that are not vendor specific. Also, today you would use EIGRP rather than IGRP. You would need to evaluate what each protocol offers and make you choice that way.
Here is a link on EIGRP that is a good starting point.
We are pleased to announce availability of Beta software for 16.6.3.
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