[iscoelho]

CE (Customer Edge) is what you are referring to. ISPs would be the PE (Provider Edge). I am aware it can be popular for SMB CE devices, however that is simply not the case for PE devices.

Service Provider ISPs cannot use Mikrotik - It is impossible. RouterOS supports none of the features required for a service provider. VRFs are even still unsupported in HW [1]. I am confused why this is even a discussion as anyone with experience working at an ISP/SP would come to the same conclusion.

[1] https://help.mikrotik.com/docs/spaces/ROS/pages/62390319/L3+...

[tucnak]

There are many ISP's that successfully run their networks on BGP, without VRF unless their customers specifically require it. It simply means that VRF-heavy architectures (like dense MPLS L3VPN etc.) would require additional hardware. Nobody says you have to use MikroTik for everything, and nobody says it's the ultimate solution to all ISP problems. I don't get it where this maximalist view comes from—all or nothing. The typical MPLS VPN scenario has to do with overlapping address spaces, and for customer separation most aggregation layer deployments use pure L3 routing with VLAN segmentation in the first place.

There's a famous use-case from 10 years ago (sic!) of using MikroTik for serving over 400 customers, see https://mum.mikrotik.com/presentations/ID16/presentation_340... proving you could do it on small scale many years ago. Needless to say, A LOT has improved since. MikroTik has become a serious, and affordable means to power a small-to-midsize ISP in the recent years. Of course there are "enterprise" features for some people to get knickers in a twist over, but they are well beyond necessity. It's often that people were taught certain techniques, a certain way to do things (which more often than not includes all this domain over-extension madness and all that it carries with it up to L7!) so they struggle to adapt to alternative architectures.

To say that it's "impossible" to provide ISP services with MikroTik is reaching.