meaning not as good as another available route would have been. its all about administrative distance and TIMING when doing route redistribution. suboptimal routes can happen when redistributing routes from one routing protocol to another. or from different processes of the same routing protocol. anyway hope that helps ...

What is optimal routing?

Network engineers know that one of the tradeoff in network design is Optimal Routing. ... Thus, overall which path provides more bandwidth, that path is considered shortest path, thus Optimal Routing.

What is sub optimal route?

Suboptimal routing can occur when there are multiple points of redistribution between the same two routing domains. ... When R1 learns the route from the OSPF domain, it will use that route due to the lower AD (110 from OSPF is better than 120 from RIP).