Why is RIP still being used?

Question

Computer networks

Why do I still see support for the RIP/RIPng protocol in all lines of network equipment?
Where can it be applied with all its shortcomings? After all, almost every textbook on networks in the topic of dynamic routing begins with the words "this is RIP, but it's garbage and it's just for an example."
Why is it needed?

Answer 1

First, the legacy of the past (legacy systems). Networks, like any infrastructure, are difficult to upgrade, so compatibility is worth maintaining.
Second, more subtle point. For example, you are a provider. The client has many devices that need dynamic routing. What to do? BGP, for example, they will not pull. EIGRP proprietary (waiting for revealing comments about RFCs). When using OSPF, it is quite difficult to filter prefixes, and letting outsiders into an OSPF domain is fraught. RIP is quite organic here.

Answer 2

I know several networks where there really are old L3 long lines with firmware that is no longer updated, in my opinion 3420, maybe I'm wrong. They, apart from RIP, do not know how and will not be able to do anything. And there is also tricky equipment: satellite modems, DOCSIS hubs for example. The same situation.
Yes, and it works fine, if you do not expect more from it.

Answer 3

It is ideal in a small network, and let’s say even in xpi there is support for rip, but Windows don’t really know about bgp and ospf

Answer 4

a pack of braces, it is necessary to give at least routes for connected subscribers with a fixed address to the kernel. here is another protocol like from a cannon on sparrows