Dino Farinacci wrote on 26/03/2020 20:24:
An (S,G) entry is a route. You know modern routers can support many orders of magnitude of 1000 routes. I am answering your question of scale in terms of number of routes. If you mean something else, than just say so.
this is kinda the problem though: multicast resource usage on intermediate routers scales according to the number of sessions going through those routers. The more sessions, the more state that the routers need to maintain. This is fundamentally different from unicast where it doesn't matter to the router how many sessions or data flows are passing through it.
We tried session based routing years ago. It was an interesting idea at the time but it didn't work at scale.
Nick
