I have a router that is a stub, it's a 7200 series (old model) that is connected to another router (which is acting like it's gateway) model 7300 series.
There connection between both routers is a POS, and everything is working fine.
When we attempted to add another POS circuit therefore trying to create redundancy we noticed that the CPU on the 7200 series router is increasing with the increase in traffic.
I'm suspecting that the 7200 has a hard time load-balacing the 2 links, because as of now ISIS is what is balancing the traffic.
I was thinking of introducing CEF, but I don't know if it's possible.