Hi Pavel,
Robert, is there any non-production implementation of simple-va, which we could play with?
The only implementation I am aware of is cisco ios component code. Yes there are non-production EFT images you could perhaps get from cisco to play around with it.
Since I have switched recently and I am not longer a vendor, but an operator you will need to ask your cisco colleagues to get you some test images.
The main concern here is, of course, whether a router will be infinitely installing/withdrawing tons of FIB entries because of 'natural' prefix flaps, how much black-hole/loop this will create in practice, and how to deal with it. Did anyone perform some research of this? Any reports exist?
The router with simple-va functionality enabled will not install nor withdraw even single additional route on top of what it would do when simple-va feature is not enabled. So it is guaranteed to be no less then today.
We simply added logic to table-map filter code which with matches on next hop of less specific route suppresses covered more specifics with identical next hop. The only real additional price (there is no free lunch) is extra CPU when you need to walk back the table in the event of some prefix just with mask between less specific and more specific get's into the RIB/FIB with different next hop. But if I would deploy this functionality it would be to save the edge router's FIB and do it within the POP while POP boxes would still keep full table. That one that extra walks and extra CPU does not need to be used.
Btw as a side note I spoke to some Juniper colleagues and there really liked the idea too :) Btw ... it equally well works for Internet as it works for VPN vrfs.
Best, R. _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
