We run a small datacentre network, about 150 servers between two data centres with a thrid coming online soon. We currenly have our /21 annouced by our upstream's BGP speakers and they route it to two of our Cisco 3825s which we use to subnet our /21 to smaller ranges. Our second site is connected directly to primary site, so if we loose those 3825s or datacentre, both sites go down.
I have been tasked to create a small BGP network and annouce our /21 ourselves. The long term plan is to go with ASRs or 6500-E at our core sites, however our traffic levels are only about 50/60 Mbps with peaks of around 100 Mbps, so I think it is a waste of space, money and power to use them from day one.
So from day one, we are looking at adding a couple of routers per site, and taking two providers at each site with OSPF/iBGP between them. We will only take default routes (although full routes will be nice). It would be nice if we could do MPLS and IPv6 in hardware but not a deal breaker.
Would a 2911 or 3925 be adequate for this job? Any advise would be good.