  MANET is a collection of mobile devices with no centralized control and no
pre-existing infrastructures. Due to the nodal mobility, supporting QoS during
routing in this type of networks is a very challenging task. To tackle this
type of overhead many routing algorithms with clustering approach have been
proposed. Clustering is an effective method for resource management regarding
network performance, routing protocol design, QoS etc. Most of the flat network
architecture contains homogeneous capacity of nodes but in real time nodes are
with heterogeneous capacity and transmission power. Hierarchical routing
provides routing through this kind of heterogeneous nodes. Here, routes can be
recorded hierarchically, across clusters to increase routing flexibility.
Besides this, it increases scalability and robustness of routes. In this paper,
a novel ant based QoS aware routing is proposed on a three level hierarchical
cluster based topology in MANET which will be more scalable and efficient
compared to flat architecture and will give better throughput.
