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 <sbahnse...@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 > >
