An extended Roman domination function on a graph G=(V,E) is a function satisfying the conditions that (i) every vertex u for which f(u) is either 0 or 1 is adjacent to at least one vertex v for which f(v) =3. (ii) if u and v are two adjacent vertices and if f(u)=0 then f(v)≠0, similarly if f(u)=1 then f(v)≠1. The weight of an extended Roman domination function is the value ( ) Σ ( ) The minimum weight of an extended Roman domination function on graph G is called the extended Roman domination number of G, denoted by ( ).The Hexagonal networks are popular mesh-derived parallel architectures. In this paper we present an upper bound for the extended Roman domination number of hexagonal networks.