[ROUTING] Settle a pointless debate - more commonly used routing protocol in total deployments - OSPF vs IS-IS

Fri Jan 25 14:45:07 UTC 2019

I'm personally aware of dozens and dozens of OSPF deployments,  but not
aware of a single IS-IS deployment.  This is among smaller consumer ISPs,
with typically up to around 10K customers.

I'm sure a big reason for this is that IS-IS support isn't all that common
in the lower end routing gear often used by these providers.

On Fri, Jan 25, 2019, 7:16 AM Steven Bahnsen <sbahnsen20 at gmail.com wrote:

> Hi,
>
> First time poster looking for some input on a debate and I apologise if
> I've
> done this completely wrong, but I don't think my colleague will be
> convinced
> until he hears it from this community.
>
> Granted I'm relatively green when it comes to networking, but it was my
> understand that other than BGP, the most widely used/implemented IGP
> would be
> OSPF. However, my colleague insists that I'm 100 percent wrong and that is
> IS-IS.
>
> I want to be clear, I'm not debating which protocol is better or worse, as
> they
> both have their strengths and weaknesses and ultimately it comes down to
> several
> factors based on a particular use-case on which routing protocol is the
> best way
> forward for a network.
>
> However in saying that, I believe that, when it comes to sheer numbers of
> where
> an IGP is implemented, OSPF is far more widely used in the world today,
> whether
> it be in small to medium to large businesses, Enterprise networks and even
> Service Provider networks (where as per my understanding, is where IS-IS
> really
> shines)
>
> I understand that this isn't really quantifiable, but I would like to get
> the
> opinions/experiences from this list and see what the outcome of this
> question is
> out of sheer curiosity.
>
> Thanks!
>
> Steve
>
>
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