[j-nsp] 32-Bit JunOS on the 64-Bit Routing Engines

[Robert Raszuk]

Hi Keegan,

> They are saying that the new 16G RE's can handle 250M routes.  How is this
> possible if none of the daemons are 64bit?

The only real practical scaling use case I am aware of in the range of
5M routes today is for vpnv4 route reflectors.

Another possible scaling point would be perhaps in poorly implemented IX
route server functionality where you would need to copy entire table to
each RS peer in order to execute per peer policy. So indeed if you have
500K of v4 routes and 500 peers it would indeed result in 250M prefixes
to be handled.

Other then that just from routing point of view I am not sure what's the
practical use of such RE or 250M of routes on a real router. I think
control plane can scale and 64bit routing stacks migration is already in
progress (or even completed and shipping few years back on some other
platforms), but forwarding I am afraid is far from that range. So you
are left there using either simple-va like approach, come back to old
good caching or worse process switching on the RE ;-)

Cheers,
R.