()1 For 10 Mbps, 2811 should be okay. This assumes you also use "tcp mss-adjust" and insure PMTU works correctly to minimize the need for router to do any fragmentation.
(2) 12.4 mainline would be my preference. I think the base feature set supports both EIGRP and OSFP and GRE.
(3) PfR PIRO version (found in later 12.4T) can compliment EIGRP (although I have not first hand experience with that type of PfR configuation). Believe it also requires one of the non-base IOS feature sets. As to what it is, that's perhaps best explained by other informaton on Cisco's web site.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...