Hello,

I have one RB1000 as Gateway. When there is usage about 50/20 Mbps CPU is at 70-85%...
On this Gateway is also enabled firewall, mangle, etc...

I'm connected like this...

FIBER OPTIC > (ether1) - (ether2) < CLIENTS

And my next idea was to buy two more RB1000 and put like this

FIBER OPTIC > (ether1) RB#1 (ether2) RB#2 + (ether3) RB#3

I would put my one IP class /22 (about half users) on RB#2 and another IP class /22 (and second half users) on RB#3...

And is it better for RB#1 to be just transparent bridge for FIBER OPTIC or also router, firewall? Or it's better have router and firewall on each?

Thank You in advance! I hope You understand me...

why three RB's i guess 2 would do if you need to have half the subscribers on one rb and the other half on the other. Just request your ISP for 2 public IP's and have one IP on either

I assume you are managing your clients with some kind of dynamic AAA (dhcp or pppoe).
i'd configure the systems like this: The IP assignment can be done dynamically by RADIUS while the load balancing will be done automatically between the two RB (the less heavy loaded will get the client requests)
I dunno all your specific requirements but maybe a consultant will give you the best ideas for your ISP

@Medianet: That's what I've planned, but I'll ask my ISP if they are able to give me 2 gateway IPs on FIBER OPTIC and try idea from @gmidia...