No documentation about using EIGRP with what kind router can build a large network using Metro Ethernet. Cisco7600 become unstable unstable after applying over 600 eigrp neighbors.
Though i m not much sure about the topology of your metro network we did the same kinda implementations with 7600 boxes but with OSPF as the IGP.
I feel more inputs from you on your architecture like whether you have tiered setup also the preimplementation plans you had before decided on with eigrp will definetly help here..
Are you using eigrp stub's for all of the remote branches? I have not utilized eigrp for that large of a network, but understand that the scalability is much greater by utilizing stubs where possible.
you need to stub connect where you can. summarize where you can. it's not a hardware problem. we run 800 remotes on eigrp...it's fairly smooth...keep in mind that your ethernet circuit is a broadcast domain...you may want to identify your neighbor manually. you need to figure out who is forcing your restarts on your netowrk as well
Right, CPU 100% only happens when one interface coming up. I am interesting how your 800 remotes connecting to main site? Using subinterface gi0/0.x for each remote?
Is there a reason you need EIGRP? If you're scaling to 1000 neighbors you should really use BGP. It's meant to be scalabale (I have routers that have 150,000 BGP routes in it). It's really designed for scalability, where as I find EIGRP is preferable in a low-neighbor routing environment.
