we've had some issues with our relatively cheap but high performance ISP (i.e. lots of bandwidth at good price but not 100% reliable) and want to protect our service by getting a second lower speed circuit from a different provider. Whilst we can do clever multihoming and DNS to allow our service to switch providers, it converges too slowly... so...
We want to get some PI space, an AS number and put in place two routers to give resilience. Some people tell me each router should be at least a Cisco 7204VXR with 1GB of memory, but to me that seems overkill for what we want, or maybe I misunderstand, since by and large we'll only be announcing our own prefix, and accepting default routes from our ISPs (and, if there's a partial failure) tweaking preferences to force fail-over.
I've searched the forum but the search tools are crap and I couldn't find a discussion of how to size a router in this instance. Any ideas would be gratefully received.
thanks for reading this.