In real life, if a company has cisco and other vendor routers, do they use EIGRP and OSPF or only OSPF?

Depends on the scenario.

Ideally, you would only want IGP, but redistribution is not uncommon.

EIGRP is Cisco proprietary

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Both EIGRP and OSPF are IGP.

I would not use EIGRP ever. Why would I want to tie my hands?

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I'm pretty sure he meant 'only want 1 IGP'

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my one key is f'ed on my work laptop

You might when you have specific design requirement such as building a large-scale DMVPN.

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You can use DMVPN with OSPF.

Most of our customers are running EIGRP. They're mostly all Cisco shops though.

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My network uses EIGRP. 6 months ago the ISP began to deploy BGP as access protocol to the MPLS in new branches, to avoid the Cisco dependency.

Yes you can use a OSPF-based DMVPN, but it wouldn't scale as well as a EIGPP-based DMVPN.

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"It can also be argued that DNA is nothing more than a program designed to preserve itself. Life has become more complex in the overwhelming sea of information. And life, when organized into species, relies upon genes to be its memory system."

Im on the OSPF side of the fence and will deploy it in all situations unless there are specific reasons to go with EIGRP.

This post always sticks in the back of my mind lately. I know OSPF can be tweaked but done properly EIGRP can give some really good results with little customization.
http://blog.ioshints.info/2012/01/loop- ... eigrp.html

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You're still limiting yourself to Cisco only

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True you are. Plenty of companies including my current company set up around a single vendor. This is done with all equipment. Network gear with cisco, servers with HP, etc...This is done to stay uniform through out the entire infrastructure and make purchasing simpler. If your shop is like this then you have already been put in the situation.

Im not saying I agree or disagree with this strategy. It really depends on the environment but I do hear about this more often then not.

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My main issue with it is the future. Maybe you're an all Cisco shop now. But one of these days someone is going to come out with a device that just ticks every single box you need at the time. That box is not Cisco. Well now you have to redistribute and get messy.

Even if I did run an all Cisco shop I would not run EIGRP. I don't like limiting myself.

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+1. We are a 100% Cisco shop and the only running EIGRP are CE's where customers insist on using it as their own IGP, it comes nowhere near anything else though.

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David
CCIE R&S #38338, CCIP, CCNP

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As a point of historical interest, you used to be able to run EIGRP on Huawei gear.
Before Cisco sued them.

EDIT: javentre beat me to it almost two years ago: viewtopic.php?f=33&p=117954#p117972

True, but for DMVPN it doesn't matter since DMVPN is Cisco proprietary (although there are examples where people ran it on Linux using OpenNHRP).

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"It can also be argued that DNA is nothing more than a program designed to preserve itself. Life has become more complex in the overwhelming sea of information. And life, when organized into species, relies upon genes to be its memory system."

The book i'm reading says that when using the command "router ospf <1 - 65535> the process-ID is meaningless. What gives? If it's meaningless, then why is it there?

process id differentiates between OSPF processes, if you were running multiple instances of OSPF, how could the routers tell the difference to which instance they belong?

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"If you're good at anticipating the human mind. It leaves nothing to chance."
-Jigsaw